They come in two sizes. The full size is about 1 to 1.5 metres and the dwarf varieties about 60cm to 90cm.
When planning hydrangeas for your garden do carefully consider their location. They are happy with morning sun and afternoon shade. Before planting add some compost to the soil.
Be sure to keep them well watered especially in the early stages. Hydrangeas are thirsty and will wilt.
Pruning should be after flowering. Only trim back those stems that have flowered cutting just above a plump bud.
Fertilise in the spring with a complete fertiliser and mulch well. Great if you have your own homemade compost.
Some hydrangeas are known for changing colour according to the acidity or alkalinity of the soil. Add lime for pinkness or aluminium sulphate to promote blue. White hydrangeas usually do not change their colour.
My hydrangeas are losing their strong colours so I am putting more lime around them to keep the pinkness.