Property: ASK TOBY THE TV GARDENER.
Q Why has the blue hydrangea I bought a few years ago gone pink?MARY STEVENS, Birmingham
AThe answer is simple, Mary. Hydrangeas are a great species of plant for telling you whether you have acid or alkanine soil.
If your soil is neutral to slightly alkaline, that is to say it has a pH of 7 or above, hydrangeas have pink flowers. If you garden on acid soil (pH below 7), then the flowers would be blue.
If you plant a blue-flowering hydrangea on alkaline soil, the flowers will eventually turn pink. Likewise, if you plant a pink-flowering hydrangea on acid soil, its flowers will eventually turn blue.
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| Publication: | Sunday Mercury (Birmingham, England) |
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| Date: | May 8, 2005 |
| Words: | 109 |
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