Hi Tui, why are my rhododendrons light on flower heads this year? We have been feeding them with home made seaweed tea. The plants look healthier than they were last year.
You could try using Tui Enrich Rose, Camellia, Azalea & Gardenia Controlled Release Fertiliser or Tui Acid Food. These a specially developed to increase soil acidity for acid-loving plants to thrive.
Thanks, Tui Team.