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10 votes

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

From pioneer.com: "Foliar absorption of herbicides occurs in a liquid phase only; once a water droplet has dried on the leaf surface and herbicides have crystallized little to no additional ...
Danijel's user avatar
  • 221
10 votes
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How long for glyphosate to penetrate plant

Glyphosate is systemic in action - that means it takes about three weeks to kill a plant, but with the added proviso that it's at its most effective as a weedkiller if applied when weeds are growing ...
Bamboo's user avatar
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8 votes

Can I degrade Groundclear with vinegar

Checking the product label for Groundclear, we see Glyphosate and Imazapyr are the villains. Active Ingredients Glyphosate, isopropylamine salt.....5.00% Imazapyr, isopropylamine salt.......0.08% ...
MackM's user avatar
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7 votes
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What is this weed and how do I kill it without killing the grass?

It does look like wild violets, and they are difficult to eradicate, but triclopyr, or any other lawn weedkiller that purports to kill these, is much more effective used in autumn, see here https://...
Bamboo's user avatar
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7 votes
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How do I naturally eradicate a stand of invasive bamboo?

I'm sorry to say that its likely most of those methods will work - chopping it all down and covering with black plastic will probably mean you'll have bamboo shoots growing up through the plastic, it'...
Bamboo's user avatar
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6 votes

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

Glyphosate is a systemic herbicide. It really only needs a few hours to get into the plant before a rain. It is not a quick killer in basic formulation, but absent resistance, it kills the whole plant....
Tony's user avatar
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5 votes
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Why does Tenacity® (mesotrione) kill bentgrass but not other grasses?

That particular herbicide is known as a HPPD inhibitor. It works by blocking an enzyme in the plants. The plants normally break down a particular amino acid (tyrosine) and use the components to ...
PoloHoleSet's user avatar
5 votes

Elimination of Japanese Knotweed by injection

The usual method is to pour glyphosate down the hollow stalks,not sure how well the one you mention will do. Repeat and ongoing treatments are necessary,but one other thing - if you're going to cut ...
Bamboo's user avatar
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5 votes
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How long does Copper sulfate pentahydrate persist in the soil, after application?

Because of the variability of the environmental fate of this chemical, which shows different decay/leaching rates in different soil textures/environments, you cannot get a direct answer such as "...
J. Musser's user avatar
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5 votes
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Is it safe to use herbicide without clear withholding period?

This Monsanto page says that it depends on the strength of the product used. For the product used on perennial weeds, wait 72 hours. Glyphosate is a contact killer that is taken up by the leaves, ...
Graham Chiu's user avatar
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5 votes

How heavily are herbicide products restricted in the UK?

Quinchlorac is not approved for use anywhere in the EU, and the UK is unlikely to approve it post-Brexit "just because it can". Arguably it is banned for good reasons, since it has long ...
alephzero's user avatar
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4 votes

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

It's hard to tell from the picture, but I think that may be a tree of heaven that sprouted there. If that's the case if you just cut it to the ground it will come back over and over again but if you ...
Tyler K.'s user avatar
  • 1,729
4 votes

Will glyphosate directly harm Monarchs or other butterflies?

I have a hard time with injecting glyphosate into hollow stems for treatment. I've read this as well but the way glyphosate works is to be taken up by the leaves, vigorously growing leaves and it is ...
stormy's user avatar
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4 votes
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What type of weed is this and what is an effective way of removing it?

It's Stellaria media, commonly known as Chickweed and its an annual (dies in winter). It's very easy to dig out, but the difficulty is the amount of seed it produces IF you have allowed it to flower; ...
Bamboo's user avatar
  • 134k
3 votes

Will glyphosate directly harm Monarchs or other butterflies?

You're right in that the effect on Monarch butterflies is indirect - its caused by glyphosate being used on milkweed. But if you are going to treat Japanese knotweed with glyphosate, you don't need to ...
Bamboo's user avatar
  • 134k
3 votes
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Weed control 1 year before installing turf

The weeds won't overtake turf, provided you haven't left persistent/pernicious weed roots in the ground, it's grass sown from seed that will have that problem. You just need to ensure you dig out, all ...
Bamboo's user avatar
  • 134k
3 votes
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Ivy or something else? Want to know the accurate name

Looks like blackberry, invasive in zone 8 and probably many other zones. I find the fruit to be flavorless but many people love it, birds also love the fruit.
blacksmith37's user avatar
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3 votes
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Can something else grow after We spray/pour herbicide to kill a plant?

It sounds like your contractor is proposing using a stump killer if you don't have the stumps and roots bored out. These products are usually not sprayed,but applied directly to the stump; ...
Bamboo's user avatar
  • 134k
3 votes

Will applying copper sulfate for the sewer drain kill trees?

If tree roots have managed to find their way into the sewer pipe and expanded their entrance hole through sheer growth then the pipe may be compromised enough that any poison poured into the sewer may ...
Colin Beckingham's user avatar
3 votes
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How and what herbicide to spray around trees without killing them?

Yes, glyphosate is the one to go for. As well as preventing strimmer (what you call "weedwacker") damage, maintaining a vegetation-free circle around the trunk is particularly beneficial for ...
Peter4075's user avatar
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3 votes

How to get rid of the weed not the grass

With the greatest respect, the easiest solution is to realise that there is no logical reason why domestic lawns have to be weed free. It's different if you're a professional groundsperson. In that ...
Peter4075's user avatar
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2 votes

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

Glyphosate must penetrate the leaf surface to provide effective weed control. While absorption occurs relatively quickly, rain after an application can wash glyphosate off before it has a chance to ...
TeeC's user avatar
  • 21
2 votes
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Need help controlling purslane germinating after seeding new lawn

Once the grass does get established, I don't think purslane will germinate there anymore (unless you remove your lawn some day, since the seeds can last a long time). I would just pull them ...
Brōtsyorfuzthrāx's user avatar
2 votes

How can I remove crabgrass from a Zoysia lawn, and flower beds?

Re the flowerbeds, yes, you need to dig them over and extract all weed roots, preferably without leaving any behind. The guy at Home Depot's advice was incorrect though - if you want to use Round Up, ...
Bamboo's user avatar
  • 134k
2 votes

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

An other method it to use "flamethrower" (add "garden" or "weed" to google search). They are not really flamethrowers, but I think such name attract more people. But you really need to dig or to use ...
Giacomo Catenazzi's user avatar
2 votes

Weed control 1 year before installing turf

I am constantly amazed that in all my decades of gardening, weeds have never ever been a problem..they are there, I know how to manage them effortlessly and I also know that a healthy bed of soil that ...
stormy's user avatar
  • 40.5k
2 votes

Is it safe to use herbicide without clear withholding period?

When I was in pesticide...school, grins, there was an instructor who laughingly said you could drink this stuff. ha ha. The chemistry of glyphosate changes the second it is sprayed on another ...
stormy's user avatar
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2 votes
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Sequencing for tick, weed and fertilize treatments for lawn

It is unlikely you will need to use any kind of pesticide to kill ticks on your lawn; assuming you practice good maintenance, like cutting it regularly, and the lawn is primarily in sun and is ...
Bamboo's user avatar
  • 134k
2 votes

Does the glyphosate in our urine make it improper for use as a fertilizer?

Well that is the 64 dollar question... It is likely that the amount of glyphosate present in human urine is at such a low level it will be ineffective as a weedkiller, but nonetheless, glyphosate ...
Bamboo's user avatar
  • 134k
2 votes
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Do my tomatoes have aminopyralid herbicide damage?

Tomatoes are hyper sensitive to herbicides , it can drift hundreds of feet from an application area and affect tomatoes. And, yes, herbicide in a compost can affect them. My son got some free rich ...
blacksmith37's user avatar
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