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. I sent an email to ⦠Environmental impact: As you might imagine, there are two camps on this. Roundup is simply a product that primarily contains the ingredient glyphosate, which is clearly a chemical. I have very established plants in all of them and don't use round up. Systematically, this is what you need to remove overgrown and unwanted weeds. (A stray drop of vinegar on a desirable neighboring plant will cause some browning, but probably not kill it.) Yet, the question will roundup kill trees remain an interesting topic. He sprayed all around my Azalea & Rhododendron and under them. Rhododendron is difficult to treat chemically because the uptake of foliar-acting herbicides through the thick, waxy leaves is low. Aided by surfactants in the chemical mixture, glyphosate permeates the leaves and enters the the plant tissue that transports food. But beware, because it is systemic, if a little drop gets onto another plant, Roundup will kill this too. When you spray Roundup on weeds, it settles on the leaves. Itâs strong and powerful to damage certain areas of plants from the leaves to the roots. 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. Since this first attempt to kill trees with roundup, I have done a lot of research on how to kill trees. Only a trace amount is involved because more than a trace would simply kill the shrubs. Often referred to by the uninformed as âannual weedsâ 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! Use Glyphosate Properly to Protect Woody Plants. Is there a safe way to use Roundup near trees? Q: Can plants other than roses get rose 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. In my searching, I found a recipe from the Utah Ag Extension that uses roundup and will kill even the toughest trees. The use of glyphosate I find so important in Winter is against weeds that come from seed. Kill moss with an herbicide and it can easily be mowed or lifted out of your lawn. Q: What do you know about recent findings that Roundup harms trees when sprayed under them to kill weeds? Re-planting can occur within four weeks after weed death. As long as the round up doesn't touch the leaves of the plants you want to keep, they will survive? A: Because I see this so often, I believe it is glyphosate damage to your shrubs. So roundup may kill your tree but it didnât kill my well-established elm trees. 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