They never need to be pruned. Now if you wish to remove the dead blooms that is fine. You do this with small shears or garden sissors just below the bloom. Now if you feel that the bush is just to big for you, you will need to wait until after the spring. They produce their blooms for the next year in the fall so if you trim them then, you will loose your next years flower. So wait until after the spring bloom and before Aug. to do this.
Do not trim a lilac bush in the spring because you will cut off all of the flower buds. Trim a lilac bush after it flowers.
You need to prune the bush. You should try and do this annually.
Best to use hedge clippers but only after the blossoms have expired.
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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.
You can trim the plant back to about three inches and mulch the plant.
Yes, it is recommended to cut off dead hydrangea blooms to encourage new growth and improve the overall appearance of the plant.
Trim the magnolia during the dormant season, which is winter. If you feel you must trim it, the branch must be removed at the trunk. Cutting pieces of branches can cause undue stress on the plant, causing illness or death.
To properly trim a peace lily plant, use clean and sharp scissors to cut off any yellow or brown leaves at the base of the plant. Remove any dead or wilting flowers by cutting them off at the stem. Make sure to only trim what is necessary to maintain the plant's health and appearance.
I am not sure when the tree sets its buds, but you would trim the tree after the tree has bloomed in the spring to avoid cutting off the buds for the flowers.
After it flowers. Just take off the dead flower heads unless you need to shape it. The less pruning the better.
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