Does it have anything to do with the photsynthesis process, or is it 'genetic' to specific flowers/plants?
What determines the colour of petals/leaves?
The colour of petals is genetic and petals do not contain chlorophyll. The colour of leaves is also genetic but as most leaves contain chlorophyll, which uses light energy to assist in making the sugars the plant uses for food, they are generally green or greenish.
Even plants which have strong red pigment in their leaves, such as the copper beech and many other plants with similar foliage, have chlorophyll but the green is masked by the other pigments.
Reply:I don't know about many flowers but hydrangas vary depending on the acidity in the soil. The ones in my garden are nearly out and they will be a beautiful pink because my soil is acid.
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