Hydrangeas generally begin to develop buds in mid-to-late spring and start blooming in early summer. The exact timing depends on the type of hydrangea and the climate:
- Bigleaf Hydrangea: Late spring/early summer through fall
- Bracted Hydrangea: Late summer through early fall
- Smooth Hydrangea: Early summer through early fall
- Cascade Hydrangea: Late spring through summer
- Climbing Hydrangea: Late spring/early summer through late fall
- Mountain Hydrangea: Mid-summer through early fall
- Oakleaf Hydrangea: Late spring/early summer through fall
- Panicle Hydrangea: Mid-summer through fall
In warmer climates (growing zones 7-9), they may stop blooming during intense summer heat and then rebloom in the fall. Hydrangeas typically bloom from early summer throughout fall. For reliable blooms, they need the right conditions such as some shade, rich moist soil, and proper watering. Also, pruning timing differs by type, especially with old-wood hydrangeas which set buds in autumn and bloom the following spring and summer. So overall, hydrangeas bloom mainly from late spring or early summer through to fall, with specific timings depending on species and climate.
