Gardening and Landscaping Stack Exchange
Gardening and Landscaping Stack Exchange

Questions tagged [herbicide]

Herbicides are chemicals used to kill plants. Use this tag with questions about how to choose and use herbicides on different plants.

A chemical used to kill plants. These can vary from "kill everything" types through to selective types (e.g. broadleaf lawn weedkillers).

Herbicides are usually applied with water soluble sprays, but they can also be granular salts (eg. lawn "weed & feed" mixes; and copper sulphate) or solid (native copper can be an effective tree-killer).

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Should I be using pre-emergent or post-emergent herbicide?

The air temperature is in the mid 60s, and already the weeds started to germinate. Is this a good time to spray a pre-emergent herbicide or is it too late? Should I apply a post-emergent herbicide instead? Can I apply both together? I want to make…
Nilesh
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Is it safe to use herbicide without clear withholding period?

This year I would like to get rid of weed around wire fence and I'm considering using herbicide. As much as I can see all non-selective (glyphosate) herbicides available at local stores have no information about withholding period (after what…
False Identity
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Should I use Roundup in irrigation ditches?

If I use Roundup to keep weeds and grass out of the irrigation ditches that bring water to my vegetable garden, will it end up washing downstream and killing my vegetables? Also, will it harm my vegetables if I use Roundup on weeds growing in the…
jdickson
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Why does Tenacity® (mesotrione) kill bentgrass but not other grasses?

Tenacity (mesotrione) is used to kill bentgrass, clover, and other non-desirables. I get how an herbicide could selectively kill broadleaf weeds while leaving grasses alone, but how does it manage to kill bentgrass and poa annua while not harming…
That Idiot
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Is it best to wait for poison ivy to fully sprout leaves before spraying it?

I have a fair amount of poison ivy growing on one part of my fence. Now that spring is here, it's just barely started to grow again, and buds that will turn into the dreaded leaves have began to appear (note the slightly lighter colored growth…
Derek
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Will glyphosate based herbicide work with a food thickener?

I would like to thicken some Roundup to form a drip-free paint for targeting weeds in groundcover beds. If I use Thick-It starch based food thickener, will I get the result I want? I would be watering down the Roundup 4-5 times normal, because of…
J. Musser
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How to eradicate Berberis growing in a Thuja hedge?

I have some Berberis shrubs growing inside a hedge of Thujas. They are very difficult to access. Is there any efficient chemical method of eradicating just those Berberis shrubs?
elhombre
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Pepper plants are showing strange, deformed new growth, what could it be? Virus? Deficiency? Herbicide?

A New-ish gardener here! This year I have planted 5 varieties of peppers in a brand-new raised bed in central Arkansas (zone 7b). The fill for the raised bed is 100% compost purchased from a local plant store, with no amendments or…
Joseph Benton
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What type of weed is this and what is an effective way of removing it?

This weed kind of took over my front yard (around 300 sq ft). I'd like to remove it all and then mulch most of the area What type of weed is it and what would be an effective way of removing it? In the past, I have used vinegar with success, but…
Viccari
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Will the yellow stain from prodiamine come off of white landscape stone?

I hired landscapers to do a ton of work at my house and one part was to fill a very large area with white landscape stone. Contract stated they would put paper under it then the stone. They did not put the paper down and with one storm weeds came up…
Susan Beth RB
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How can I remove crabgrass from a Zoysia lawn, and flower beds?

We just bought a new house in Orlando. The home is great but we noticed crab grass taking over and a few other weeds. I'm a total noob with grass stuff, although I'm researching all I can. The grass type is Zoysia. Trugreen recently came and did…
Jay S.
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How long does Copper sulfate pentahydrate persist in the soil, after application?

In particular, I am interested in it's effects after it has been applied and the roots affected have been largely removed. Does it break down over time, and if so what is the time frame? What will happen if something else is planted where roots…
Michael
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Will herbicide damage affect long term grapevine trunk health?

My new vineyard (planted 2 months ago) has experienced some herbicide drift two weeks ago from a neighboring soybeans field, causing immature and new leaves to cup, finger around the edges and not properly develop into decent leaves. Symptoms seem…
Paul W
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Will applying copper sulfate for the sewer drain kill trees?

We have old terra cotta sewer drain pipes and recently had a plumber remove a large amount of tree roots. He said we should flush root killing crystals a couple times a year. I am assuming it is copper sulfate. Will the copper sulfate kill or effect…
awpawluczkowycz
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Weed control 1 year before installing turf

I want to install irrigation and turf in my backyard sometime next year. Related questions have been asked, but the focus is mostly about soil preparation. In my case, a variety of grassy and broadleaf weeds have been established for multiple years.…
Spencer Joplin
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