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Take out any old or straggly canes completely,and cut back the branches that have flowered this year to just above a pair of leaves or their buds. In the older types, you can do this back to leave 3 leaf nodes, but if it is a newer hybrid be less severe.
How much to cut back your hydrangea depends on the variety of hydrangea you have, and where you live. In northern climates "Annabelle" and "pee gee" hydrangeas can be cut back to eight inches, and still produce a three foot-high shrub with flowers during the summer. "Mophead", "Lacecap" and "oakleaf" hydrangeas set their blooms in late August, September or October, so you have to prune them in early August to be sure you aren't cutting off next year's blooms. Prune out up to a third of the stems of an older plant to encourage new growth. Prune those stems to the ground. Otherwise it usually isn't necessary to prune them at all. Just cut off the spent flowers (deadhead) down to the next stem or mature leaf.
It is very easy to grow hydrangeas in Queensland. They virtually grow wherever they are planted. Out west, they will need more water, and it is still important to keep them watered well in coastal areas during dry seasons. A fact sheet on growing hydrangeas in Australian conditions can be found at the related link below.
they change colour with the soil pH level.
yes
I posted a link that has everything you need to be succesfull in you Hydrangeas planting in the related links box below.
In gardening
No.
Prune it after leaf fall. It depends why you want to prune it. Trees dont usually need pruned as it spoils their natural shape. If it has become too large for its space then cut it back but remember pruning causes more growth.
It may be best to hire a professional when pruning large trees. Heavy tree branches, dizzying heights and heavy chainsaws make this a dangerous task. If the tree that you are desiring to prune is not very tall, or only the lower branches are concerned, it may be a task you can handle yourself.
It doesnt say.. but he is very prune to having illness, her is a very dickly child
Hydrangeas