Garden Detective: No impatiens in pots
Ball horticultural mixmasters Laguna beach Calibrachoa and burpee flash mob bluerific petunia growing in pots in Jessica Damiano's garden. (May 2013) Credit: Jessica Damiano
It's possible to change the color of hydrangeas either pink or blue by manipulating the soil's pH. It's important to note it's a lot harder to turn alkaline soil acidic than the other way around.
To make acidic soil more alkaline and turn blossoms pink, simply incorporate lime into the soil. This works pretty quickly and may not have to be repeated for a few years. But to make the soil more acidic, you have to add sulfur, and repeat applications will be needed to maintain the pH. If you choose to use sulfur, be sure to follow package instructions very closely and carefully.
