It’s a Hydrangea of a Different Color Now
Q: Two years ago I bought a hydrangea plant at a local nursery. At the time of purchase the plant had blue flowers on it. Since I planted it in my yard the plant has thrived, but it now has pink flowers. Why?
A: The plant was grown in an acid soil at the nursery. Acid soil promotes blue flowers in some hydrangea varieties. Your home soil must be alkaline; this causes pink blooms. If you prefer blue flowers, add aluminum sulfate to your soil in late fall or winter.