Hydrangea Growing Guide

Hydrangea’s are hardy campaigners that add colour, texture and vibrancy to the garden. The flowers are perfect for picking and drying and are widely used in bouquets or on their own in a vase. As Hydrangea flowers age the colour fades to reveal wonderful antique shades of lime, rose and copper which are simply beautiful.

3 steps to planting hydrangea 


Plant Hydrangeas in well-worked, fertile soil with plenty of Tui Compost and in a shady area of the garden. Hydrangeas will cope with sun, but the flowers tend to not last as long, and the leaves can turn brown in intensely hot areas. Hydrangeas are a vigorous plant, and quick to establish.

Some favourite varieties include Climbing, Lacecap varieties, Mopheads, Oak-leafed Hydrangea and Grandiflora.


Like building a house a good foundation is the key to success in your garden. The better the soil, the better your plants will grow. If you are starting with an existing garden bed dig in organic matter like Tui Sheep Pellets and Tui Compost to your soil. Then you can add a layer of Tui Flower Mix.

Directions for planting in garden beds

  • Water plants thoroughly before planting and allow to drain.
  • Add a layer of Tui Flower Mix to the planting area.
  • Dig a hole, approximately twice the depth and width of the root ball of your plant.
  • Gently loosen the root ball of your plant and position the plant in the centre of the hole.
  • Fill in with Tui Flower Mix.
  • Press soil gently around the base of the plant.
  • Water your plant well and continue to water regularly.

Directions for potting plants

  • Water plants thoroughly before potting and allow to drain.
  • Half fill your container with Tui Flower Mix.
  • Gently take the plant from the current container, loosen the root ball and remove any loose or dead pant material and roots.
  • Position the plant in the centre of the new container and fill with Tui Flower Mix up to 3cm from the top.
  • Gently firm mix around the base of the plant. The mix should be at the same level on the plant as it was in the previous container.
  • Water your plant well and continue to water regularly.


Feed your plants and they will feed you. Plants use nutrients from the soil as they grow, so replenishing the nutrients ensures your plants grow to their full potential. For flowers select an all-purpose variety such as Tui NovaTec® Premium Fertiliser and use this in autumn.

A well-watered, well-nourished garden will have a better chance of keeping insect pests and diseases at bay. While your flowers are growing regularly apply a dose of Tui Organic Seaweed Plant Tonic to give them a welcome boost.

Hydrangea colours can change with different soil fertility. Flower colour can be altered easily but adding either Tui Lime to enhance red or pink flowers, or Tui Hydrangea Blue to deepen blue tones. Changes should appear within a few weeks.

Prune back to reduce the plant by at least half in autumn, cutting to just above a pair of leaves. Don’t leave it until after the winter, as it will limit flowering for the following season.