Niall Walsh asked 13 years ago
My wife has 2 blue Hydrangeas at the front of the house ( north facing) for the last 8 years in large pots. But they have not florished and do not retain the blue colour for her….any suggestions?
1 Answers
Gerry Daly Staff answered 7 years ago
To maintain blue colour, use only rainwater and applying a blueing agent which you can get in garden centres, or add a level tea-spoon of sulphate of iron to a 10 litre watering can when watering.
