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Questions tagged [herbicide]

Herbicides are chemicals used to kill plants.

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1answer
55 views

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 ...
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3answers
50 views

Options to kill/remove invasive buckthorn

I have a large number of mature buckthorn shrubs in my yard that were there when I purchased the property. This is classified as an invasive in North America. Not only is it problematic in terms of ...
5
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2answers
218 views

Will glyphosate directly harm Monarchs or other butterflies?

A large portion of my yard is infested with (non-native) Japanese knotweed, which is nearly impossible to remove without herbicides. I have been waiting until late summer/early autumn to begin an ...
2
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1answer
36 views

Is there a selective herbicide for crabgrass that can be applied during high temps?

I'm in Alabama zone 8a, and crabgrass is taking over my Zoysia lawn. I just purchased the home and was not able to put down a spring preemergent. The crabgrass infestation is pretty thick in spots and ...
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3answers
82 views

Control of oxalis corniculata

I have a "plague" of Oxalis corniculata in the middle of Vinca minor. Is there any way to eliminate it chemically or just tearing it off?
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2answers
75 views

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 ...
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2answers
80 views

Control of Hyacinthoides hispanica (Spanish bluebell) in an established landscape

We have several well established beds that are infested with Hyacinthoides hispanica (Spanish bluebell). For a variety of reasons I am unable to dig them out or use "petrochemicals" like RoundUp so I'...
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3answers
65 views

What is proper way of disposing weed treated with herbicides?

I would like to know what is proper way of disposing weed treated with herbicides? Is it safe to use tree killed by herbicide as firewood?
6
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3answers
103 views

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 ...
3
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0answers
190 views

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 ...
4
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2answers
46 views

How do I remove one of two different plants growing in the same spot?

There's a shrub planted in the corner of my property, that the previous owner put there to help mask the utility pole behind it. I kind of like this idea, but there is another plant growing in the ...
7
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2answers
311 views

What is this weed and how do I kill it without killing the grass?

What is this weed and how do I kill it without killing the grass? I've tried different brands of the usual spectrum herbicide that kills everything but doesn't kill grass, and everything - like ...
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3answers
2k views

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 ...
5
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1answer
510 views

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 ...
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0answers
29 views

Procedure to ensure herbicide uptake in Japanese knotweed [duplicate]

I am planning to eradicate a stand of Japanese knotweed by injection of imazapyr. This bamboo-like plant develops a rhizome system far below the ground and the only way to kill it is allow it to ...
8
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1answer
755 views

How long for glyphosate to penetrate plant

How long between spraying Glyphosate and the Glyphosate "getting in place" to kill the plant. My issue is this - I want to make productive use of an area overrun by very well established weeds - and ...
4
votes
1answer
128 views

How do I naturally eradicate a stand of invasive bamboo?

I am on a 1 acre hill-side near the Oregon coast. The previous owner of this property decided it was a good idea to plant some type of invasive bamboo that covers a good 50% of the property (mostly ...
3
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1answer
128 views

Need help controlling purslane germinating after seeding new lawn

I recently reworked a small section of my lawn (200 sqft). This work included solarization, tilling in some compost, rolling flat, spreading seed, top dressing with compost and rolling again. With ...
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2answers
556 views

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 ...
7
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2answers
156 views

Elimination of Japanese Knotweed by injection

I have a Japanese Knotweed problem in a limited area (about 15x15 feet). It is very difficult to dig up the roots because they can be a good 2 feet underground. Therefore I am considering death by ...
6
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2answers
330 views

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 ...
9
votes
1answer
146 views

Variegated Arboricola shrubs leaves wilting

What can I do to help this Variegated Arboricola to grow healthy and stop wilting? I am in Southern Florida. I was spraying my lawn with Ortho® Weed B Gon® Weed Killer For Lawns Ready-To-Spray2 which ...
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1answer
566 views

What is the most effective way to eradicate burdock, curly dock and mugwort from a field?

We've got a small "meadow" area that is in bad shape from new home construction. Despite heavy seeding with native warm-season grasses and proper mowing, the area is overrun with mugwort, curly dock, ...
8
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1answer
127 views

Can I add commercial roses to my compost pile?

I'd like to add commercial roses to my compost pile, but don't know if I can. I'm not sure what kind of chemicals store bought roses are usually treated with. Bonus question: Can I dump the water in ...
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2answers
857 views

What are the uptake and decay rates for Spectracide® Weed Stop® for Lawns?

Once a lawn has been treated with Spectracide® Weed Stop® for Lawns how long are the active ingredients 'active'? Do some decay faster then others? Following the links from the Manufactures site ...
3
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1answer
758 views

Is Clopyralid or Dicamba more effective in the control of clover in lawns?

September's coming up, time to start getting ready for clover control. I have always used Clopyralid (3,6-dichloro-2-pyridinecarboxylic acid). The brand I use is Lontrel. My question is, how well ...
2
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2answers
124 views

Can I use herbicides in flood conditions without harming good plants?

In Arizona, USA, it is monsoon season, meaning that our dry, arid, and rainless state suddenly gets a lot of rain over the period of about two months. This sort of flooding is perfect for spreading ...
9
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1answer
658 views

Is it safe to eat dandelions previously treated with a selective iron herbicide?

Three years ago, I started trying to reduce the number of dandelions in my lawn with a household selective herbicide named Scotts® EcoSense® Weed B Gon® (MSDS and retailer product page). The ...
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2answers
1k views

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 ...
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2answers
56 views

Targeted Glyphosate use on hardy nettles

We're about to begin our vegetable garden, and we have had some trouble in the past with a nettle that is particularly nasty. Our plan is to apply glyphosate based herbicide directly to the freshly ...
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3answers
632 views

Why is triclopyr not available in California?

I'm considering using a triclopyr based herbicide to defeat some clover in my lawn (dwarf fescue) in San Francisco, CA. For example, there is this product: http://www.homedepot.com/p/Ortho-Weed-B-Gon-...
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2answers
251 views

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?
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1answer
146 views

Is adding a surfactant causing my herbicide to solidify?

I mixed Triplet SF with some non-ionic surfactant in a ratio of 3:1. The mixture coagulated and formed what looked like you might see gumming up the outlet of a soap pump dispenser. Is there ...
9
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4answers
52k views

To be effective, how long does Glyphosate weed killer need to be applied before it rains?

Yesterday I used around 3 litres (approximately 1 gallon) of glyphosate (generic Roundup) around my garden. It was in the evening around 6pm. This morning I awoke to the sound of rain. Will the rain ...
6
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1answer
1k views

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 ...
6
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1answer
765 views

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 ...
9
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2answers
408 views

How do I prepare and sow a lawn organically?

Sowing a lawn organically seems to have 2 problems that need solving: Killing the weeds prior to sowing Avoiding weed growth after sowing Once the soil is levelled, I'm considering trying the false ...
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2answers
750 views

Natural herbicide to kill weeds in a hard landscape environment?

I've got some weeds growing up between the flagstones in our backyard -- is there something natural and okay environmentally that I can use to kill the weeds? Obviously, I don't want anything growing ...
11
votes
1answer
925 views

How to prevent regrowth of elm saplings from concrete foundation?

At the base of our old garage where the concrete foundation meets an asphalt slope down to the alley behind, we've had small elm tree saplings grow as weeds over the past three years. I've never ...
7
votes
1answer
4k views

Will over spray from Ortho Weed-B-Gon Max kill my flowers?

I was spraying some Ortho Weed-B-Gon Max on my lawn, and some of the mist/over-spray got in and around my flower bed (on flowers). Are my flowers doomed, or is there still hope that they will live ...
8
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2answers
588 views

What's a good selective herbicide?

I bought a house 2 years ago in San Francisco where the yard had been allowed to do whatever it pleased. Now I have an amazing mix of clover, weeds and grass throughout the entire yard. Is there a ...
47
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2answers
8k views

How long before poisons like Round-up become inert?

If I spray some grass with a poison like Round-up or Kills All, how long before that spray is not dangerous to plants? So for example, if after spraying, I walk through the sprayed area and then onto ...