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I am pruning a rather large forsythia hedge that has gotten out of control. Can I use Round Up to kill the new shoots coming up out of the ground that are spreading too much or is there something else I can use. I do not want to kill the main hedge, just keep it in check. Also, when is the latest I can trim the hedge so it will still flower next spring.
I would not recommend the round-up, it probably won't be very effective, and you would jeopardize the plant's health, and dump some nasty chemicals into your garden and the environment.
This website gives some good advice on caring for a forsythia
Boy ! I wouldn't use the Round-up. It might kill plants that you don't want killed.
Just use anvil-type pruners to clip the new growth.
I know this can be tedious, but will be better in the long run.
You can root that new growth easily by digging a small shallow trench, and covering the leaves with soil, leaving the end farthest away from the Mother plant out of the soil. Then you will have new plants.
No! Don't use round-up as it will kill or disfigure any plant it touches! Prune about 1/3 of the mature shoots (the ones with brown bark) down to about 1 foot in length and reduce the remaining branches by no more than 1/3. To remove more of the branches may weaken the plant so much it may not survive the winter. You can prune 1/3 of the mature branches down to 1 foot each year to rejuvenate the forsythia and keep it healthy and a managable size.
Forsythia can be sheared into a ball shape but that looks gross to me. It's meant to have a loose blousy shape, ragged and natural. So you select which branch is to go, reach deep into the bush to where it starts, and take out the whole length of the branch rather than taking off tips. This lets smaller branches keep growing. If you cut off a tip, several will grow in its place, which causes that ball shape, as it gets denser and more unhealthy. That's my opinion. Others differ, going for that lollipop shape, like a cartoon of a garden, where everything is butchered into shapes. Awful. One other thing to consider: if you need to prune the forsythia because it's getting too big for where it's growing, the really smart thing to do is to move it.