All your citrus questions answered

From lemons and limes to oranges and mandarins, citrus are a must-have addition to any Kiwi backyard, and can be grown successfully in the garden or in pots.

We often get asked for growing advice and suggestions on treating problems on citrus, so we have put together answers to your most common questions.

Q.

Hi, we are growing about 10 different citrus including oranges. The oranges all seem to be quite sour. I have sprinkled Epsom salts around - is that going to be enough to help? Also, how can I stop the fruit and leaves getting black scum on them? Thanks, Leah.

A.

The black scum is sooty mould, there will be insects – aphids, scale, mealy bug on the tree. Spray (with warm soapy water, or check at your local garden centre for a suitable spray) to control the insects and the sooty mould will go away. Sweetness of oranges can be affected by a variety of factors including climate (needs some warmth to sweeten), variety (some being more sour than others), ripeness (try leaving them on the tree a bit longer). To help grow successful oranges make sure you feed them in spring and summer with Tui Citrus Food and keep them well watered. Add a layer of mulch around the base of the plant too.

Q.

Hi, my lemon tree has plenty of lemons on it but no leaves. What could be causing this? Thanks, Amy.

A.

Citrus are evergreen but do drop leaves, usually when they are stressed, too cold, have too much fertiliser, or not enough fertiliser, if there’s frost, or they are too wet. I would suggest regular doses of Tui Organic Seaweed Plant Tonic every seven days until the tree starts bursting into leaf. Give it regular feedings in spring and summer when temperatures warm up. Don't feed it in winter as the tree isn't actively growing. Try adding sheep pellets to nourish the soil and mulch around the tree so it doesn't dry out in summer. If it is in a pot and become pot bound it might need re-potting.

Q.

I have several citrus trees. I've been told that in the first year of fruiting, I should remove all the fruit from the tree. In the second year, I should remove half of all the fruit from the tree (when it is the size of a 20c piece), and in the 3rd year I should remove 1/3 of the fruit. Is this good advice? Thank you, Caroline.

A.

It’s definitely a good idea to remove the fruitlets off the tree in the first year. The subsequent years, the rule of thumb you noted is a good idea in theory, but it does depend a lot on the health, strength, size and type of tree. In general terms of fruit thinning, you want to remove a portion of the crop so that when the fruit is mature, each fruit is not touching the next (as this can cause blemishes and disease problems). You also need to take into account the weight of the fruit on the branches, so that the mature fruit will not cause breakages. So after the first year, it really is a judgement call as to how well the tree is establishing, how heavy the crop is and how much the tree can handle.

Q.

I moved house and the place we are in now has a mandarin tree. The mandarins are tiny, what can I do to make them grow bigger? Thank you, Joanne.

A.

Mandarins are wonderful fruits. For the crop this year there is nothing you can do to remedy the problem. In the spring, give the plant a side dressing of citrus food and add a layer of mulch all around the base of the plant. This will feed the plant and keep the root zone moist. Over summer keep the plant well watered, small fruit indicate poor watering over the summer when the fruit develops. An application of Tui Organic Seaweed Plant Tonic now will give the plant a boost, but avoid adding the fertiliser too early as young growth may get frosted.

Q.

Hi, I got a lemon tree a few months ago. Its leaves are curling and dull. I've given it citrus food and haven't noticed a change. What do you recommend? April.

A.

Citrus leaves will curl when temperatures are cold or in extreme heat, some insect infestations such as scale, mealy bug, mites or aphids will cause leaves to curl or over-watering. We have had unseasonably cold weather.

Adjust watering depending upon the weather. Feed it Tui Organic Seaweed Plant Tonic plant tonic regularly, keep it well watered if it is heat, or just give it Organic Seaweed Plant Tonic regularly if cold and watch the watering, don’t over-water it. Feed with Tui Enrich Fruit, Citrus, Tree & Shrub controlled release fertiliser (suitable for containers) in early spring and late summer. In frost prone areas avoid feeding any later than mid February as this will push soft new growth that will frost easily and won’t have had time to harden off.

If it is an insect problem control common insect pests by spraying warm soapy water, or check at your local garden centre for a suitable spray. If ants are crawling up the tree then there is a good chance there is scale insect or mealy bug or aphids.

Q.

Why is citrus food not suitable for use in containers? Thanks, Margaret

A.

We generally don't recommend using our Food range (including Tui Citrus Food) in pots and containers because it is not a slow release fertiliser and can overfeed in a smaller space e.g. pot or container, especially if not applied in the correct amount. This will then affect the plant.  We recommend a controlled release fertiliser such as Tui Enrich Fruit, Citrus, Tree & Shrub controlled release fertiliser for use in pots and containers.

Q.

My lemon tree has heaps of lemons which don't have any juice. Do you know why this is? Thanks, Pauline.

A.

Dry lemons are normally caused through lack of water over the summer period as the fruit is forming. You can't get the moisture into your current seasons lemons but you can fix the problem so it doesn't happen next year, by watering more regularly. It can also be caused by lack of fertiliser. Now is the right time to apply Tui Citrus Food around the base of the plant then again at the end of fruiting, add a layer of mulch around the base of the plants after you fertilise to help the soil retain moisture. For citrus in containers, we recommend using Tui Enrich Fruit, Citrus, Tree & Shrub controlled release fertiliser.

Q.

Hi, can you tell me why my limes keep dropping off my tree. I get loads of flowers and most of them start to form little limes and then all of a sudden I lose most of them. I water every second day and also feed it. I am growing it in a large pot. Pam.

A.

Fruit drop is caused by stress – water (too much or too little), temperature (hot/cold extremes), nutrition problems and/or pest/disease problems. Some things to consider:

  • How long as the tree been in the pot? It may need repotting, to replenish the growing media as it can become ‘hydrophobic’ – which means the mix actually repels water. Use good quality mix like Tui Pot Power.
  • Have you fed the tree enough? For citrus in pots you need to take care to use a suitable fertiliser. Citrus are heavy feeders so need very regular fertiliser to keep the leaves dark green and glossy (no yellowing, curling or discoloured veins), with lots of new growth and fruit production. Use Tui Enrich Fruit, Citrus, Tree & Shrub controlled release fertiliser for citrus in pots, or Tui Citrus Food for trees planted in the ground.
  • Are you watering deeply enough? There should be enough water applied that it leaks steadily from the drainage holes in the pot, so that the growing media is well drenched. Check the moisture levels on the day you don’t normally water by poking your finger down into the dirt. If it’s damp it doesn’t need more watering that day, but if it’s dry, you may need to move to daily watering.
  • Is the tree exposed to cold snaps? Cover with protective cloth or move into a warm area if unseasonal cold spells/nights are expected.

Q.

The leaves are turning yellow on my mandarin tree. I have tried feeding with citrus food and worm castings, do you have any other ideas. Thanks, Jacqualine

A.

If magnesium is deficient then the leaves will turn yellow. Your tree will benefit from a dose of Epsom salts which is magnesium. Use Tui Epsom Salts. Also make sure your tree is free from weeds which will compete for water and nutrients and mulch around it to help conserve soil moisture as well as keeping weeds down.

Q.

Hello, I have a lemon tree that has lots of fruit but the leaves are covered in yellowish nodules and they are crumpling up. The fruit is flavoursome but the outer skin is looking like a case of tiny acne with thin brown lines. What do you recommend? Thanks, Rachel.

A.

The lumpy fruit and distorted foliage is caused by a fungus disease called verrucosis. It is prevalent in citrus and by spraying the tree when it has finished flowering with copper oxychloride until it starts to bud and flower will help prevent the disease.

The damage caused by verucosis is largely cosmetic. The fruit flavour is fine, and the fruit usually juicy. As the disease distorts the foliage there is reduced plant vigour but it generally doesn’t kill a plant. Regular feeding with Tui Citrus Food, watering and mulching will help the tree become more resistant to pests and diseases. Regular applications of Tui Organic Seaweed Plant Tonic will also be beneficial to your tree.

Q.

Just wondered if you have a nice way to get rid of the ants on my citrus trees but not disturb other insects like the bees! Thanks Maureen

A.

Fortunately, the ants do not harm the fruit, they are there because there will be an insect exuding a honey dew such as scale, aphids, or mealy bug. By controlling these insects you should not attract ants. Check at your local garden centre for a suitable spray - there are natural options available.

Q.

We have an orange tree in our backyard but the oranges never ripen properly, they never turn orange and when cut open they are pretty well tasteless and mushy. What could be the cause of this please?

A.

Oranges require a long warm summer and mild winter to fruit successfully. If your climate is right, the most likely reasons for the lack of fruit is the plant isn't getting enough nutrients from the soil. Fertilise in spring and summer with Tui Citrus Food. It would also be useful to prune back your orange tree to encourage some new growth and fruiting wood. The more air movement and sunlight the plant can get the more likely the fruit will ripen. Water frequently in summer as this is when the fruit is developing its flavour and size.

Q.

Hi, my lemon tree is looking lovely and lush with green leaves and new growth after giving it a dose of citrus food. It's two years old and had two blossoms when I bought it. Once planted, the fruit dropped off when they were only about 1cm long, and it hasn't blossomed since. Do you know why? Thanks, Vicky

A.

As the plant is only two years old it is not a problem that it is not flowering as it is good for the tree to spend energy in establishing its roots first. We suggest feeding with Tui Citrus Food or Tui Enrich Fruit, Citrus, Tree & Shrub controlled release fertiliser in early spring and late summer to assist with flowering.

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All your citrus questions answered Comments

  • We purchased a very run down property 10 yrs ago.we rescued an old persimmon tree amongst tall black bamboo n wonder if we can expect fruit. Have had acorn sized green fruit that just drops down. A nice shape to it though.

    Ethel Campbell

  • I tasted a lovely sweet grapefruit with an orange skin grown in the Bay of Plenty, would you know the name? thanks

    Maree

  • Hi Maree, unfortunately it is hard to be sure without seeing the actual fruit. Do you have a photo? Have a look here: https://www.waimeanurseries.co.nz/our-products/fruit-trees/citrus/ Thanks, Tui Team.

    jenna

  • Our lemon tree was planted 18 months ago - it has grown quickly to over 2 metres, looks healthy but isn't producing blossom or fruit. Is this a good thing?

    Fay Burnett

  • My established mandarin tree grows very small tight fruits which drop to the ground and a generally unedible as they are too small and not mature enough and ripened. I must admit I don't water it very often or probably feed it enough.

    Nicky Hawker

  • Hi Nicky, watering and feeding are key. In the spring, give the plant a side dressing of citrus food and add a layer of mulch around the base of the plant (without touching the stem). This will feed the plant and keep the root zone moist. Over summer keep the plant well watered, small fruit indicate poor watering over the summer when the fruit develops. Fruit drop is caused by stress – water (too much or too little), temperature (hot/cold extremes), nutrition problems and/or pest/disease problems. An appication of Seasol plant tonic will give the plant a boost, but avoid adding the citrus fertiliser too early as young growth may get frosted. All the best, Tui Team

    jenna

  • Hi Fay, it is a good sign your tree is looking healthy. Citrus trees take 1-2 years to fruit after planting. Have you fed your tree in spring and summer? All fruit trees benefit from a regular feeding regime to provide the right nutrients for maximum tree health and top crops. Feed with Tui Citrus Food in spring and summer. Mulch around the base of the tree and water well over summer. All the best, Tui Team

    jenna

  • Hi, my yen-ben is about 3 years old. Has lots of fruit but very small and it never matures. We have been feeding all the right stuff and spraying Tui spray for mites etc., Can you help please. Joan

    Joan

  • I grow some caffir lime trees in the pots and changed the soil with potting mix and compost a few months ago. Two of them had fruit but only small and the others didn't. One has slight yellow leaves. Is it better to grow them in the ground rather than in the pots? How do you make them bear a lot of fruit? They've been in the same size of pots for many years.

    Robbie

  • Hi Joan, it sounds like you are looking after your tree well. Over summer keep the plant well watered, small fruit indicate poor watering over the summer when the fruit develops. An application now with Seasol plant tonic will also give the plant a boost, avoid adding any more fertiliser now as young growth may get frosted. Thanks, Tui Team

    jenna

  • Hi Ethel, persimmon trees are normally rather robust and hardy fruits. Suggest yours probably needs some TLC to bring it back to a fruiting stage. Firstly apply Seasol plant tonic once a month for the rest of the year, fertilise it now with fruit fertiliser and add a layer of mulch around the base of the plant to protect the roots. The tree will soon be going into a dormant state; however the roots will be still active, so action will make a difference and should mean a harvest for next year. Keep up with watering over summer also. All the best. Thanks, Tui Team

    jenna

  • If your tree has grown to 2m in 2 years, take the top out and perhaps reduce the nitrogen, or a little extra potash. Cheers

    ArnieMason

  • Hi, Our orange tree has lots of lovely big fruit but some of the fruit have split open.Can you please help?

    Margaret Spence

  • Hi, I have moved about a year ago into a new house which has a lemon tree. It looks healthy enough and has lots of good sized green fruit on it but they just don't seem to be ripening. Am I being too impatient or is there something I should be doing?

    Sarah

  • Hi Sarah, it is a good sign your tree is looking healthy and has fruited. The citrus harvest season is just beginning so they still have plenty of time to ripen. We suggest feeding in spring, summer and early autumn (in late autumn there is risk of frost so we don't advise feeding now) with Tui Citrus Food to help promote healthy growth and fruiting. An application of Seasol plant tonic now will give the tree a good boost, and you can apply this every few weeks. All the best, Tui Team.

    jenna

  • Hi Margaret, this can be a problem if the plant has had too much fertiliser and a lot of water for extended periods. Whilst both are good for the plant, it can cause the fruit to grow really quickly and split. Thanks, Tui Team

    jenna

  • Hi Robbie, kaffir lime trees are very happy growing in tubs and planters, over time the root zone can get restricted so it is wise every few seasons to re-pot them into larger tubs. Kaffir limes do not produce a lot of fruit; they are mostly grown for their foliage which is used in Asian cooking. Apply Seasol plant tonic to give them a boost and trim back any long branches to encourage some more new growth and fruiting wood. All the best, Tui Team

    jenna

  • Hi Robbie, we are delighted to inform you that your question has been chosen to feature in our newsletter. Please email your address details to info@tuiproducts.co.nz and we will post your prize out :) Enjoy, Tui Team

    jenna

  • hi there. I have to grow my lemon tree in a pot so I can have it in the sun much of the day. otherwise it would get minimal especially in the winter season. how do they cope with repotting when the time comes? I have heard they don't do good to be removed. is there some good tips I can follow when the time comes? thanks adrienne

    adrienne

  • Hi Adrienne, how big is your tree? The bigger the tree the harder it can be to transplant successfully. The best time to repot would be winter. When repotting we suggest: taking it out of the tub, trimming the roots and soaking the root ball in a bucket of Seasol plant tonic. Seasol will help reduce transplant shock. You can keep applying Seasol every couple of weeks to give the tree a good overall boost. Repot into a quality mix like Tui Pot Power as it has all the goodies your tree will need in its new pot. All the best, Tui Team

    jenna

  • I live in Christchurch close by Riccarton Bush.I have a massive lemon tree.Can I grow a lime tree on my property.Thanking you in anticipation.

    John

  • Why does my lemon tree have healthy green leaves but no fruit?

    Pauline

  • Hi I have just transplanted a Mandarin tree from one side of town to my place it is about 1.5 mtrs high. The leaves are wilting and going brown. I don't know if it's to far gone but is there anything I can do to help it or am I best to try again with a younger tree. Thanks Shaun.

    Shaun

  • Hi Pauline, that's a great sign your lemon tree has healthy green leaves. It sounds like the tree has too much nitrogen in the soil which means lots of leaf growth. If your tree is planted in the garden we suggest an application of Tui Sulphate of Potash to help encourage flowering. Feed citrus planted in the garden in spring and summer with Tui Citrus Food. For citrus planted in pots and containers feed with Tui NovaTec premium. Happy gardening from the Tui Team

    jenna

  • Hi John, yes you can grow limes in Riccarton. The best one for Christchurch is the Tahitian lime. You will find them in all the shops now, get it planted in soon so it can get well established before next winter. You may need to protect it from frost over the first year or two. Remember full sun is preferred. All the best, Tui Team

    jenna

  • Hi Shaun, citrus do transplant well when they are smaller. Suggest you trim the plant back by half, this will help save the plant trying to support excess growth. Apply Seasol plant tonic once a month for 6 months and add citrus fertiliser around the drip line of the tree. Keep the watering up over the hottest months. All the best, Tui Team

    jenna

  • I am a new citrus gardener and I have potted Satsuma and Tahitian Lime which I feed with citrus food every two months - I notice that you recommend Seasol as well. What is the correct ratio of feeding if using both products? Have had an infestation of Hopper Vine insects which I have used a natural pyrethrum spray. Have also noticed a few tiny black beetles. Will the pyrethrum control both of these. Also, the Satsuma is developing some spiky lumps on the green fruit. What do I need to treat this with. Many thanks.

    Wendy Faith

  • Hi Wendy, thanks for getting in touch. It is not best practice to use Citrus Food on citrus growing in pots and containers as it can be too concentrated and could burn the plant roots. Use a slow release fertiliser such as Tui Novatec every three months in the growing season or Scotts Osmocote Citrus Controlled Release fertiliser every six months. Tui Seaweed Plant Tonic or Seasol and can be used weekly, fortnightly or monthly mixed in a watering can at a rate of 30-70ml per 9L of water. This is a plant tonic, not a fertiliser so it can be used regularly. Passionvine hopper is very hard to control, pyrethrum is the best spray to use but not safe for bees if the citrus is in flower so if using, spray early in the morning or late in the afternoon when bees are not flying, Pyrethrum won’t control the beetles. Using seaweed plant tonic will strengthen the plants and help the plant build up resistance to pest and disease. If the citrus are well fed, regularly watered, in the right position and the right size pot they should flourish. All the best ^Tui Team

    jenna

  • My lime tree has recently started to have the leaves curl up from the edges in large parts and some are curling and being eaten it looks like but I can’t find any bugs. I have pics I can show if anyone can help

    JJ

  • Hi. We've just bought a place up in the hills in Oropi, Bay of Plenty. I expect we are going to have plenty of frosty mornings here and I'm not sure of where to plant the lemon and orange trees I was given. It's a very hilly property and my choices are up on the windy exposed ridge or on a slope in one of the little valleys. The valleys will be more protected from the very strong winds we get here but won't get as much sun and will make picking fruit difficult. Do you have any suggestions? Should I cover the trees in frost cloth? Many thanks Deanne

    Deanne

  • Hi Deanne, we would suggest leaving the citrus in pots until spring when they have been through a winter so you know exactly where the frost is, how hard the frosts are and how little sun the valley gets. The valley doesn’t sound ideal if picking will be a problem, unless you cut into the bank and create a flat planting space. This will make watering, feeding and picking much easier but you still need to see how frosty and how shaded it is. Planting a hedge or putting up some shelter to protect the citrus from the prevailing wind is something that can be done now. As far as covering the trees with frost cloth, you need to see how severe the frosts are. Look at the neighbours place (if they are close by) and see what they have planted and where. Happy gardening ^Tui Team

    jenna

  • Hi I have several orange trees (Navel and Washington I think), which are probably 6 or 7 years old and produce fruit. However the fruit never seems to ripen fully (i.e. the skin doesn't go orange). Any ideas/recommendations? Thanks Ngaire

    Ngaire Phillips

  • Hi We moved into our house last July and bothered mandarin and lemon tree have been fruiting almost constantly. Both need trimming as they’ve grown a lot both up and out and the lemon tree now has branches in the ground but I read somewhere that if fruiting or flowering pruning can lead to some disease. Is this correct? When is the best time time to prune? Thanks

    Nicola

  • Hi I have a very old lemon tree that has "moss" on the branches and is spindly in growth. How can I clean it up to get healthy growth and produce well Many thanks

    Helen

  • Ata marie, I have a a mandarin tree with abnormally very large mandarins on it and there is only about 8 mandarins on the tree. The tree is approx 4 foot tall and 3 foot wide. During the summer season i gave the tree citrus food, fresh shelled kina juice whenever i went diving, copious amounts of water, some epson salts sprinkled around the drip line, blood and bone, i pruned the centre out, the garden itself has a 4 inch layer of bark also. The tree lives next to 2 feijoa trees and I'm in Hastings. I haven't opened a fruit yet as they are still green but I'm concerned as the last 2 years it gave us normal fruit with ample supply. Any advice will be much appreciated. Thank you. Steve

    Steve

  • Hi Nicola this is a great question. The best time to prune citrus is in early summer or early autumn, so you will need to wait. Avoid pruning in September/October as you run the risk of lemon tree borer laying eggs in the fresh cuts. You can prune them back quite hard, up to a third is fine. Protect cuts with pruning paste or water based paint to seal the wound. Fertilise with Tui Citrus Food in spring and regularly apply Tui Organic Seaweed Plant Tonic for an overall boost. All the best ^Tui Team

    jenna

  • Hi Helen, you can use the hose or a soft water blaster to remove the moss from your tree, once it is removed, spray with a copper spray (check at your local garden centre) to eliminate anything remaining. Next apply a side dressing of citrus fertiliser and regularly apply Tui Organic Seaweed Plant Tonic. Trim back the spindly stems in early summer, to stimulate healthy new growth. All the best ^Tui Team

    jenna

  • Hi Ngaire, some oranges do not actually go fully orange when they are ripe. If you have little or no juice in your fruit the soil could be lacking some essential nutrients. Apply citrus fertiliser around the base of the tree. Regular applications of Tui Organic Seaweed Plant Tonic will also help. Navel oranges take about 6 to 7 months to ripen, and they require plenty of sunlight. Pruning in early summer may be required to let more light into the tree. All the best ^Tui Team

    jenna

  • Hi Steve, you are being very kind to your mandarin tree. Once a tree has been pruned it can take up to two seasons for it to produce more flowering and fruiting wood, so it may be a case of being patient. Suggest you hold off adding any more nutrient based items to the root zone of your tree until mid-spring. Fruit can take up to 6 months to ripen. Hope this information helps. Happy gardening ^Tui Team

    jenna

  • Hi there, we planted a satsuma mandarin a few months ago (dug big hole, filled with nice soil and compost). He's well sheltered, has grown a little and looks healthy, currently fed with a little bit of citrus food every couple of months. At the moment he's just one stick with leaves, how can we encourage him to branch out more?

    Aaron

  • Hi Aaron, citrus are slow growing plants. Allow the plant at least six months to settle in, over winter do not expect a lot of growth, and if you live in a cold area, protect your plant from frost. All the best ^Tui Team

    jenna

  • Hi There, i've planted a sasuma mandarin tree about three months ago under a metre high with green mandarins already growing on it and starting to colour - as they aren't buds, should I still be picking them off the tree? Thanks Jen

    Jen

  • Hi Jen, great to hear you have planted your own mandarin tree. In the first year after planting your citrus, we suggest you remove any fruit that sets. This allows the tree to establish itself and encourages better fruiting in the following seasons. Happy gardening ^Tui Team

    jenna

  • I've picked an orange off our tree and it's a lovely orange but has a caterpillar or worm in it.. what should I have sprayed with to prevent this ?

    Marlene

  • Hi Marlene, this is such a shame isn’t it! The worm is most likely a larva of some type of insect, and depending on what it is, depends on what to use to control it. It is likely the eggs were laid in summer or autumn when the adult moth or fruit fly was active, and the worm has burrowed into the fruit to over winter. There is little you can do now unfortunately. Next summer keep an eye out for insects and spray then with a suitable spray if required. All the best, Jenna ^Tui Team

    jenna

  • Our lemon tree has had a hard life. It has been noved several times. But for the last 15 years it has produced many many juicy flavoursome lemons. This year I noticed the fruit was takibg a long time to ripen and are smaller than usual. Now I see most of the bark is stripped off from the ground up for about 6 inches. Any clues on what we can do to save it. It looks tragic! Thanks in advance

    Geoff

  • Hi Geoff, sorry to say the diagnosis for your lemon tree isn’t looking good. Now it has been ringbarked it is unlikely it will recover. Suggest letting it see out its life, until it finally turns up its toes. You can keep up with feeding and applications of Tui Organic Seaweed Plant Tonic, however once it has been ring barked, not a lot can be done to remedy the situation which was more than likely caused by a hungry possum. All the best ^Tui Team

    jenna

  • I know I'm supposed to stop feeding my citrus in the winter, however, when I've tried to slow/ween the fertiliser, my citrus trees turn yellow very quickly. Should this be happening? They're dwarf varieties in 60L pots.

    Toni

    • Hi Toni, only stop feeding your citrus through winter if you are in a frost prone area. If you are frost free, feed every 3 months with Tui NovaTec or Tui Enrich Fruit, Citrus, Tree & Shrub fertiliser, both are great for citrus in pots. In winter the leaves will yellow, reduce your watering when temperatures cool down as well. I like to sprinkle Tui Mini Sheep Pellets around my citrus in pots – they are a smaller pellet and can be applied around pots and are a good slow release source of nitrogen.

      Tui Team

  • Hi there, what's the most reliable way to get rid of blackberry? We thought we'd removed it and then sprayed it with weed killer. A few months later we returned to the section and it is now growing in patches all over the place. Do we need to dig it out?

    Te Rina

    • Hi Te Rina, spraying is the most effective way to rid areas of blackberry. They have runners or stolons that creep undergrown and are the ultimate survivors. Continue spot spraying with a weedkiller to control tough weeds (check at your local centre). A systemic weed control product for hard to control weeds is best for blackberry, the more it establishes and the bigger it gets the harder it is to control.

      Tui Team

  • Hi team. Which mandarin grow best in chch? Does it do well in a pot? Thx

    Fee

    • Hi Fee, great question. Clementine is a variety commonly grown in NZ that is suited to cooler growing conditions and has a low heat requirement. It also grows well in pots and containers. You could also check at your local garden centre for other varieties available that will be suitable for your region. Happy growing!

      Tui Team

  • Hi, I have a mandarin tree now 4 years old and quite small. So far we haven't had any fruit on it although a few flowers. I feed it regularly and it is near a lime tree. Is there any obvious reason it isn't fruiting yet?

    Nikki

    • Hi Nikki, no other than where is it planted, is it getting enough sun? Maybe it needs an extra boost with potassium (potash). Apply Tui Sulphate of Potash, it can be mixed in a watering can and applied or around the dripline of the tree. The other thing you can do is to scrape up some leaf litter from around an established fruiting citrus tree and place it around your mandarin. There is a mycorrhiza (beneficial soil microbes) that live in the soil that benefits citrus and enhance fruiting.

      Tui Team

  • Hello, I have a little problem. Whenever I move my citrus tree to direct sunlight, the top leaves become soft and curl. Why is that?

    Jakob

    • Hi Jakob, the tree is showing signs of stress. It could be that the new growth needs to harden off or the tree needs more water than it is being given at the moment. Water your citrus until the water drains out of the pot. In summer this could be daily, in winter once a week depending on the weather. Also give your citrus a regular application of Tui Organic Seaweed Plant Tonic every 2-4 weeks at a rate of 70ml per 9L watering can.

      Tui Team

  • My lemon tree is very unwell. It has leaf drop and large brown marks in the leaves which seem to increase in size. I have fed it and sprayed with conquero oil. It has been very wet here.

    Juliet Clarke

    • Hi Juliet, this sounds like poor drainage if the leaves have large brown circular rings, and this is caused by a fungal disease. Is the tree planted in free draining soil? Citrus don’t like wet feet which can happen in heavy clay soils. Are you able to improve the drainage? Re-planting the tree into a raised bed might help to do this. Conqueror oil is for insects and won’t help a fungal disease. Your local garden centre can recommend a spray, but to stop it happening the drainage will need to be improved. 

      Tui Team

  • My wife and I are in Nicaragua and just now learning if the benefits of citrus leaf tea. What is the best way to sustainably harvest the leaves of citrus fruit trees without harming the fruit growing potential?

    Steven

    • Hi Steven, don’t pick all of the leaves, leave some of the branches to flower and form fruit. By harvesting the new leaves you will be reducing the chance of fruiting. The more you pick the more this will stimulate new leaves and growth. You will need to sacrifice some trees and leave them to fruit if you want citrus fruit as well.

      Tui Team

  • Hi Tui, my lemon tree is growing what looks like oranges. They taste sour and bitter. What should I do to turn the fruit back to lemons?

    Cristina

    • Hi Cristina, that is likely to be the rootstock that has taken over, which can sometimes happen if the tree has been pruned back severely. There will be vigorous shoots coming from the base of the tree that may look different to the lemon tree foliage. To get the lemon back you will need to remove the (orange) rootstock suckers as they will dominate the lemon because it is vigorous.

       

      Tui Team

  • Hello Tui. My passion fruit vine has started to flower. This seems like an odd time of year for flowers to develop. Why is this happening ?

    Sarah

    • Hi Sarah, it has been an unseasonably warm autumn and the weather hasn't really turned cold yet, many plants are flowering out of season. As soon as temperatures drop flowering will stop, the fruit is unlikely to amount to anything, pick any fruit that set off the vine.

      Tui Team

  • Can an established kaffir lime tree be dug up from a garden and potted up into a pot? How should it be done? What would it’s chances of survival be? Thank you.

    Di Barr

    • Hi Di,

      There is no mention of how big the tree is, but you can transplant a kaffir lime tree, success will depend upon how well established the tree is. June/July is a good time to transplant anything in the garden. Before moving the tree it is a good idea to go around the dripline of the tree to a spade depth - this is called wrenching. Leave the tree for at least two weeks, it will start producing new roots and this will hopefully help reduce transplant shock. Also start applying Tui Seaweed Plant Tonic to the tree weekly until it gets shifted, to help reduce transplant shock. Continue feeding the tree with seaweed once it is in its new pot to help it get established, seaweed helps stimulate new root growth. Use a quality potting mix such as Tui Citrus & Fruit mix which is specially formulated for growing citrus in pots. It isn't a good idea to use garden soil or compost in pots as this compacts down and eventually starves the roots of air and fertiliser, compost and soil isn't as well draining as potting mix either. Trim the tree back by approximately a third, this will help stop foliage from wilting when it is transplanted, it is best to do this on a dry day and it can be trimmed back before shifting.  Good luck, The Tui Team.

      Tui Team