If you've always wanted pink and purple French hydrangeas but your plants stay stubbornly blue, try this soil amendment that's hiding in your fireplace.

Deadhead hydrangeas early; prune timing depends on whether they bloom on new or old wood. Protect plants with mulch, burlap, or cages in cold climates; move potted hydrangeas indoors below 45°F.

Bigleaf hydrangeas thrive in morning sun, afternoon shade, and moist, well-drained soil. Regular fertilization and watering are crucial for healthy growth and blooms. Prune after flowering, but avoid ...