endless summer hydrangaes - Knowledgebase Question

kennesaw, Ge
Question by mst31
June 30, 2010
i planted 3 endless summer hydrangaes last summer. they get late afternoon sun here in atlanta ga . they bloomed pretty good in spring i had given them fertilizer granules. the flowers were pink as i had put lime on them around april. two weeks back i put starbucks coffee grounds around the base as i wanted them to be blue. not i guess they are confused and the flowers are muddy violet ,i do water


Image
Answer from NGA
June 30, 2010

0

Hydrangea blooms color can be affected by soil pH. A somewhat acidic
5.5 should turn them blue, a more alkaline 6.0 should turn them pink with
the effect being more intense the more extreme the pH. Pink and red
hydrangeas often turn blue or purple in acid soils. Blue hydrangeas can turn
pink in alkaline soils. Plants can be made (or kept) blue by applying
aluminum sulfate to the soil; plants can be kept pink by liming the soil or
applying superphosphate. Color change may vary. I hope this answered your question.

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