Can a hydrangea bush be cut back and if so, how far?
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Cut back to good leaf joint two or three from the bottom but not till after last frost of winter. Leave spent flower heads on the plant till then.
you always cut off 'dead' wood to promote new growth
depends on what kind of hydrangea you have. Some bloom on old wood, some bloom on new wood.
yes! but be careful not to overprune, it might hurt future growth
It is a good idea to remove about one third of the canes (usually the oldest and not all from the same part of the plant) at the ground. If this is done regularly, the bush will remain healthy.