how and when do you prune a forsythia bush?

Answer 1

Gee, I wish I could agree with your first two answers, and I almost didn't answer because I despise turmoil, but here I go........
Okay, first of all, Forsythia blooms off of the wood. Therefore, you will not be affecting a thing if you prune in late fall, which is when it needs to be done. As far as how, this all depends on which shape you prefer. I happen to be a fan of the wild freeflowing look that the plant offers. When in full bloom, it is as if the flowers are suspended in air with no support, and I just think it looks cool. However, some like to keep them more contained and rounded, and some keep them in tight hedges. Whichever shape you like, the time to do it is after the lovely fall color drops off. If you are dealing with overgrown plants that have been left unattended to for years, you probably need to cut them down to around two feet and reshape them. If let go, they become huge.

And, the general rule certainly does not apply to plants that are setting bloom buds during the summer, such as azaleas.

Answer 2

First, don't try shearing a Forsythia like a hedge - this will reduce the quantity of blooms and result in an ugly plant. You prune it by cutting off individual stems as close to the ground as possible. Never prune Forsythia in Fall - next year's blooms are already starting and you'll lose them. The best time is shortly after it blooms in the Spring. If it's been blooming fine, just remove any dead or damaged stems and enjoy your bush.
If it isn''t blooming well and gets plenty of sun (too much shade inhibits blooming), cut off a third to a quarter of the stems. The oldest stems are usually woodier and thicker and these are the ones you want to remove. Fertilize, etc. as usual. Do this for 3 years and your Forsythia should be completely rejuvenated. It may need it again in another 6-8 years. Best of luck.

Answer 3

Find a picture of one and and prune it like that. It blooms on new wood so in the fall would be best. By the way, you can take cuttings the root very easily.

Answer 4

There is a general rule for pruning everything:
If it blooms in spring, prune in fall. If it blooms in fall, prune in spring.
Same for perennial flowers, trees, and bushes!

Answer 5

whenever you have a sharp knife and time.