blue hydrangias - Knowledgebase Question

lexington, Ke
Question by ldegnore
May 15, 2010
i purchased an

Answer from NGA
May 15, 2010


Your soil is alkaline and you'll need to change the pH over a period of months, and probably treat the soil around your hydrangea every year or two to keep the flowers blue. A soil pH test kit will help you determine how often to treat the soil. For blue flowers, treat the soil with 2 Tablespoons of aluminum sulphate per plant, making 4-6 applications at 2 week intervals, starting in the early spring before the plants bloom. (Sulfur will acidify the soil. The desired pH range is between 5.5 and 6.) It's too late to change the pH for this year's flowers but start next spring with a sulfur treatment and the flowers should be blue.

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