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Re-planting can occur within four weeks after weed death. I have nandina, geranium, boxwood, hibiscus, rhododendron and other plants that are showing symptoms of rosette disease. Often referred to by the uninformed as ‘annual weeds’ they are not exclusively so; they might be annuals, biennials or perennials, they are merely seedling weeds - or if your maintenance is poor they might be rather larger! Hand-weeding and using a mulch over the area to prevent re-growth of weeds is a better strategy where replanting is desired. As long as the round up doesn't touch the leaves of the plants you want to keep, they will survive? Field experiments have been established to examine the efficacy of a range of chemical herbicides applied as stump treatments to control regrowth of cut infected rhododendron plants. How It Works. If weeds must be treated with herbicide, the chemical glyphosate (sold as Round-up and a number of different names) can be used on weeds that are actively growing. Hello, One of my over-anxious neighbors decided he was going to help me out and sprayed round up around ALL my flower beds. Kill moss with an herbicide and it can easily be mowed or lifted out of your lawn. If you accidentally spray a small section of a plant you want to keep, the whole thing dies or only that section? I sent an email to … ... are not affected by a particular herbicide. Yet, the question will roundup kill trees remain an interesting topic. Roundup is simply a product that primarily contains the ingredient glyphosate, which is clearly a chemical. Since this first attempt to kill trees with roundup, I have done a lot of research on how to kill trees. Q: What do you know about recent findings that Roundup harms trees when sprayed under them to kill weeds? (A stray drop of vinegar on a desirable neighboring plant will cause some browning, but probably not kill it.) A: I found the article you read and reviewed it. Apply by spraying Roundup on the leaves of any plant you want to kill. So roundup may kill your tree but it didn’t kill my well-established elm trees. In my searching, I found a recipe from the Utah Ag Extension that uses roundup and will kill even the toughest trees. It’s strong and powerful to damage certain areas of plants from the leaves to the roots. Use Glyphosate Properly to Protect Woody Plants. Q: Can plants other than roses get rose rosette disease? He sprayed all around my Azalea & Rhododendron and under them. Environmental impact: As you might imagine, there are two camps on this. Killing perennial weeds is best done before planting with materials like 2,4D and Roundup which leave little or no soil residue. The use of glyphosate I find so important in Winter is against weeds that come from seed. But beware, because it is systemic, if a little drop gets onto another plant, Roundup will kill this too. A: Because I see this so often, I believe it is glyphosate damage to your shrubs. I have very established plants in all of them and don't use round up. Aided by surfactants in the chemical mixture, glyphosate permeates the leaves and enters the the plant tissue that transports food. Is there a safe way to use Roundup near trees? Only a trace amount is involved because more than a trace would simply kill the shrubs. When you spray Roundup on weeds, it settles on the leaves. Systematically, this is what you need to remove overgrown and unwanted weeds. Rhododendron is difficult to treat chemically because the uptake of foliar-acting herbicides through the thick, waxy leaves is low. The plants you want to keep, the question will Roundup kill trees with,! On how to kill trees up around all my flower beds in chemical. Hand-Weeding and using a mulch over the area to prevent re-growth of weeds is a better strategy replanting... 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