Related to other plants, some horticultural experts say it's just a figment of the imagination that flowers can change color, that it doesn't happen in nature and can't happen in your garden. But ...

To make the flowers pink, broadcast a cup of dolomitic lime per 10 square feet and water it into the soil. It may take a year to see a noticeable change in flower color from this treatment.

Spring officially arrived in March. But if you're tired of spring snow storms, you can cut some branches from your flowering shrubs and have spring flowers in a few days.