Hydrangea bushes usually get 3 to 8 feet tall and wide , but some types stay smaller while others grow much larger. A few climbing hydrangeas can reach 30 to 40 feet , and some panicle hydrangeas can get to about 15 to 20 feet in the right conditions.

Typical sizes

Hydrangea type| Mature size
---|---
Smooth hydrangea| 3–5 ft tall and wide 1
Bigleaf hydrangea| 3–6 ft tall and wide 1
Mountain hydrangea| 2–4 ft tall and wide 1
Oakleaf hydrangea| 6–8 ft tall and wide 1
Panicle hydrangea| 5–15 ft tall, sometimes up to 20 ft 135
Climbing hydrangea| 30–40 ft tall, 5–6 ft wide 15

What affects size

  • Variety matters most. Different hydrangea species have very different mature sizes.
  • Pruning changes the final look. Some kinds can be kept smaller with regular pruning, while others will naturally keep growing larger.
  • Growing conditions matter too. Sun, soil, water, and climate all affect how big the plant gets.

Practical rule

For most garden hydrangeas, plan on a shrub that ends up around 4 to 6 feet unless you choose a compact dwarf type or a climbing variety. If you’re planting near a fence, walkway, or window, checking the specific cultivar is the safest move because hydrangea size varies a lot.

TL;DR: Most hydrangea bushes are medium-sized shrubs, but depending on the type they can be as small as 2 feet or as large as a 40-foot climber.