Key Takeaways The pH levels of your soil can affect bloom colors, so amend your soil according to your desired color.Avoid clay soils, as hydrangeas require moist, well-drained soil.Look for blooms ...

If you are growing old-wood hydrangeas, whose buds grow in the fall and then overwinter before blooming, you cannot prune them in the winter or early spring. If you do, you will remove the buds, and ...