MY Neice is doing a science fair project on plants. More
specifically she needs to know if you water your flowering plants with
colored water, does the flower change colors and if so, why?
Dyeing flowers works best on cut stems in water:
Title: The Effect Of Color On The Speed Of Dyeing Flowers
Some rooted plants can change flower color by altering the soil pH:
Anthony R. Brach
This sounds like a good question for a science project. I think she should
do the project first and get some data and then try to answer the question
herself. If she can't figure it out, then she should look for some help.
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Update: June 2012