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