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Question On Spray For Flower Bed
Posted on 3/25/26 at 7:58 pm
Posted on 3/25/26 at 7:58 pm
I have a bed with Shi Shi Camelias and Double Knockout Roses. What can I spray to kill weeds and grass that will not hurt my flowers ?
1
Posted on 3/26/26 at 10:10 am to Old Man and a Porch
This might help Controlling Weeds in Flower Beds - LSU AgCenter
I spray glyphosate (e.g., Hi-Yield Grass Killer) non-selective herbicide on weeds in my landscape beds, taking care not to have the herbicide contact the shrubs. Glyphosate won’t harm the shrubs unless it makes contact, and even a little accidental contact wont harm a mature shrub. Follow this with heavy mulching - I personally like pine straw, 3-4 inches thick, but use the mulch of your choice.
You can also add some granular pre-emergent herbicide (read article for options) after adding the mulch, and water it in. Don’t do that if you plan on planting flower seeds in the bed.
ETA: after re-reading the article I posted, I noted no specific name brands of pre-emergent herbicides are mentioned. Dimension (dithiopyr) would be a good one, fairly inexpensive and you can also use it in lawn (doesn’t control sedges or chamberbitter), and Gallery (Isoxaben) is very good, more expensive though, but it does control chamberbitter.
I spray glyphosate (e.g., Hi-Yield Grass Killer) non-selective herbicide on weeds in my landscape beds, taking care not to have the herbicide contact the shrubs. Glyphosate won’t harm the shrubs unless it makes contact, and even a little accidental contact wont harm a mature shrub. Follow this with heavy mulching - I personally like pine straw, 3-4 inches thick, but use the mulch of your choice.
You can also add some granular pre-emergent herbicide (read article for options) after adding the mulch, and water it in. Don’t do that if you plan on planting flower seeds in the bed.
ETA: after re-reading the article I posted, I noted no specific name brands of pre-emergent herbicides are mentioned. Dimension (dithiopyr) would be a good one, fairly inexpensive and you can also use it in lawn (doesn’t control sedges or chamberbitter), and Gallery (Isoxaben) is very good, more expensive though, but it does control chamberbitter.
This post was edited on 3/26/26 at 11:16 am
Posted on 3/26/26 at 10:18 am to CrawDude
quote:
I spray glyphosate (e.g., Hi-Yield Grass Killer) non-selective herbicide on weeds in my landscape beds
Same. I use a piece of cardboard and hold it against the plant if I'm worried about some getting on it.
Posted on 3/27/26 at 8:36 am to CrawDude
quote:
You can also add some granular pre-emergent herbicide (read article for options) after adding the mulch, and water it in. Don’t do that if you plan on planting flower seeds in the bed.
I bought some Roundup Weed Barrier granules on a whim one day just to try it out in one of my flower beds. Active ingredient is pendimethalin. Didn’t prevent weeds for 8 months like the bag claimed. But it worked very well for quite a few months.
Posted on 3/27/26 at 9:02 am to OysterPoBoy
quote:you could take that same piece of cardboard, plus a bunch more, lay it out over your beds, wet it down and cover with mulch and you’d have the same result (no weeds) without the chemicals
I use a piece of cardboard and hold it against the plant if I'm worried about
Posted on 3/27/26 at 9:53 am to PillageUrVillage
quote:
I bought some Roundup Weed Barrier granules on a whim one day just to try it out in one of my flower beds. Active ingredient is pendimethalin. Didn’t prevent weeds for 8 months like the bag claimed. But it worked very well for quite a few months.
Most, just about all, pre-emergent herbicides, have an efficacy of 3-4 months in the Deep South given the heat and rainfall which breakdown the chemical more rapidly than stated on the bag-container.
Owners, degreed horticulturists, of a large retail garden center in Baton Rouge discussed this on their lawn & garden radio program one Saturday and explained herbicide research trials of these large chemical manufacturers are often conducted in the mid-west in cooler-dryer climates and in those climates a pre-emergent can have have efficacy for 8 months, but not in the Deep South. Anyway, helpful little tip for those inexperienced in lawn & garden management.
Posted on 3/27/26 at 9:59 am to cgrand
quote:
you could take that same piece of cardboard, plus a bunch more, lay it out over your beds, wet it down and cover with mulch and you’d have the same result (no weeds) without the chemicals
Definitely an option, as well as thick layers old newspaper covered with mulch which was easy in the old days when everyone got newspaper delivered - not so common anymore….lol.
Posted on 3/27/26 at 10:02 am to CrawDude
Interesting info. 
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