Why would flower colour change?

adidas(6/7)June 3, 2014

I know that some plants, such a hydrangea can change colour according to iron content in the soil...but I'm wondering why an Asclepias quadrifolia would change from pale pink to snow white w/out a trace of colour. I have 2 plants at different locations in a disturbed woodland area. They both were pale pink last yr and both are white this year. We had a harsher Winter followed by a wetter Spring but beyond that I can't think of any other differences that could be applied to both plants. Any ideas would be appreciated!

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rhizo_1 (North AL) zone 7

Hydrangeas change according to aluminum uptake not iron. Many flowering plants revert to parental genetics in subsequent generations. It's not a desirable trait but entirely predictable in some plants.

Try planting a favorite color of yarrow, lol.

    Bookmark   October 14, 2014 at 10:37AM
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