Question
I have a geranium of the mounding annual variety that I purchased from a home improvement store because of its lovely color combination,red/magenta with purple inside; but since I planted it in the ground (zone 7) it only blooms orange red! Is there anything I can add to the soil to make it change again?(like hydrangeas)

Answer
Meredith,
I suspect that the color change has more to do with the change in light than anything in the soil. Geraniums don't change color in relation to the pH such as Hydrangeas.  The plant was undoubtedly grown in a greenhouse where it got diffuse light, not real direct sun. Fertilization may play some role - plants coming from a greenhouse are usually pretty "pumped up" on fertilizers. You can try giving it a slightly higher dose of liquid fertilizer, being sure to water well first so you aren't fertilizing a thirsty plant.  But my guess is that the direct sun is changing the color.

I hope this helps,
C.L.