Deep, blue hydrangeas are a stunning feature in any backyard. The addition of Tui Hydrangea Blue to your garden will enhance the deep, blue colour of your hydrangeas. Tui Hydrangea Blue also benefits other acid-loving plants, acidifying soil to create ideal conditions for healthy growth so plants reach their flowering potential. Use in your flower garden, to reap the rewards of superior plant performance. Established plants Apply 30g (approx. 2 tablespoons) per square metre of garden. Lightly fork into the soil around the plant. Water in well after application, taking care to wash any product off the plant foliage. Apply in spring before bud burst and then again in October and November.