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).

67 questions
51
votes
2 answers

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 my lawn, how long until I am not going to be…
Vaccano
  • 611
  • 1
  • 6
  • 8
15
votes
7 answers

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 have diluted the glyphosate or will my weeds…
Coomie
  • 2,864
  • 6
  • 21
  • 35
12
votes
1 answer

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 managed to pull one out when they are very small, and…
Michael
  • 317
  • 1
  • 7
10
votes
2 answers

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 at all there, so it doesn't matter if it kills…
Noah
  • 203
  • 1
  • 4
9
votes
2 answers

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 seed bed technique to kill off any remaining…
Highly Irregular
  • 1,473
  • 5
  • 14
  • 27
9
votes
1 answer

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 is near these plants. Prior to the…
Ryan Gates
  • 367
  • 1
  • 2
  • 11
9
votes
1 answer

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 manufacturer's web site says: Weed B Gon controls…
Steve HHH
  • 253
  • 2
  • 7
8
votes
2 answers

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 good selective herbicide I can use or is my only…
Dave
  • 253
  • 1
  • 3
8
votes
1 answer

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 the vase on the pile as well (with the little…
Philip
  • 1,162
  • 3
  • 11
  • 20
7
votes
1 answer

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 on?
Tester101
  • 593
  • 1
  • 4
  • 8
7
votes
2 answers

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 clover, dandelions, etc - does die, but not this stuff.…
BlueDogRanch
  • 173
  • 4
7
votes
1 answer

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 only have 3 days in which to prepare the area and…
davidgo
  • 3,426
  • 1
  • 14
  • 25
7
votes
3 answers

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 injection: cutting off the stalks about 6 inches…
Andre Lenotre
  • 905
  • 4
  • 15
7
votes
2 answers

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 it looks like the active ingredients are 2,4-d,…
James Jenkins
  • 245
  • 1
  • 11
6
votes
2 answers

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 eradication campaign using glyphosate. In general I…
alexw
  • 203
  • 1
  • 5
1
2 3 4 5