Any professional/amateur Gardeners on SVTP?

I have a problem with Grape Hyacinth all over the lawn. It just spreads further every year. Weed killers don't seem to kill it. You can't just dig it up either. There's utterly 100s that you can see, and that's just whats above the soil. There's a shitload of bulbs still waiting to come up.
I have to bag my lawn everytime so I don't further spread those little ****ers all over my yard.

I want to kill it dead. Preferably while keeping the grass green.
Any professional suggestions, or anyone else that has dealt with these bastards?

Gasoline.

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2,4D Herbicide

Digging and vinegar spray, LOL. Almost sounds like you have to kill the yard and start over. That is a NASTY weed. Maybe your local garden shop will have some advice.

Weather Man said:

Digging and vinegar spray, LOL. Almost sounds like you have to kill the yard and start over. That is a NASTY weed. Maybe your local garden shop will have some advice.

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They sold me a stump killer that you spray, and that didn't do it last year.
The damn "bulbettes" are a good 4-6" under the soil. Digging would make an absolute mess. I'm hoping to defeat these ****ers without killing the grass.

Get up with the folks at Do my own or The Lawn Forum, they will steer you in the right direction.

Not sure what that is, but I just had my whole yard killed and starting fresh. There was no stopping the deep rooted weeds. Like you said, some nasty ass shit was like 12” under the surface. It laughed at round up.

2,4-D is your best herbicidal approach. The downside is it will take more than one application, so it may take a couple years to eliminate. If it that bad, kill everything and start over. There are other kill all herbicides besides Round-Up. Look for some thing with a higher glyphosate content.

Does the 2,4D kill the bulbs too? Or just the actual vegative growth above the soil?

I have a similar invasive weed that at least is green. It keeps spreading every year. The plan to remove it, if I moved forward, was to spray the entire backyard and sides with a strong herbicide in the Spring and wait until early Fall to re-seed from scratch or lay down sod. Due to the expense and mess to do that, I declined. Like I said, the weed is green (lighter in color than the good grass), so it could be worse, I guess.

I recommend digging them up when they first start to grow, or smother them out. Get a bunch of cardboard and dig the top inches up, lay down some cardboard, soak it down then bury it with the soil. The plants wont be able to penetrate the cardboard and should rot in the soil before the cardboard disintegrates.

Pre-emergent 3 times a year, coupled with spot treatments as they pop up. Need to core aerate before to get everything deep below the roots. Fertilizer and as the grass grow it will choke everything else out. Plan at least 2 good seasons before you really see results.

98 svt said:

Does the 2,4D kill the bulbs too? Or just the actual vegative growth above the soil?

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It will kill above ground, but weaken the bulb; hence the statement from the quote below, it will take 2 good seasons to really abate it. A good dose of high glyphosate will kill everything and very likely the bulbs. You just need to figure which way you prefer. Junior00 has the best plan to treat and correct if not killing everything.

Junior00 said:

Pre-emergent 3 times a year, coupled with spot treatments as they pop up. Need to core aerate before to get everything deep below the roots. Fertilizer and as the grass grow it will choke everything else out. Plan at least 2 good seasons before you really see results.

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Great plan.

gf uses white vinegar to kill weeds. she might add salt to it also, I don't remember

BlckBox04 said:

gf uses white vinegar to kill weeds. she might add salt to it also, I don't remember

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Salt works well but you have to be careful with the dosage, it can wipe everything.

MDShelby said:

It will kill above ground, but weaken the bulb; hence the statement from the quote below, it will take 2 good seasons to really abate it. A good dose of high glyphosate will kill everything and very likely the bulbs. You just need to figure which way you prefer. Junior00 has the best plan to treat and correct if not killing everything.



Great plan.

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It’s the only way I’ve ever gotten control of a yard besides burning it all and reseeding from scratch.

Junior00 said:

Salt works well but you have to be careful with the dosage, it can wipe everything.

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Epsom salt and Dawn liquid.

Junior00 said:

Pre-emergent 3 times a year, coupled with spot treatments as they pop up. Need to core aerate before to get everything deep below the roots. Fertilizer and as the grass grow it will choke everything else out. Plan at least 2 good seasons before you really see results.

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What do you mean by Pre-emergent?
Other than that I've been doing everything else you mentioned.
Only my time will tell now.

98 svt said:

What do you mean by Pre-emergent?
Other than that I've been doing everything else you mentioned.
Only my time will tell now.

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Basically it’s an herbicide than keeps the seeds from popping up or sprouting. I usually do spring, early summer and fall. “Weed & Feed” is basically that plus a fertilizer.

Have you had your soil tested? The pH as well as soil temps will tell you a lot about what type of fertilizer will be most applicable. For instance, the typical all purpose 13-13-13 contains equal parts potassium, phosphate and nitrogen. Depending on the soil you may need more of one and less of the others. Core aeration helps greatly because it allows oxygen and the nutrients you apply to reach the roots much easier as well as bypasses the soil compaction that slows the absorption.

Make sense? It is by no means an easy process but diligence will yield results. Raking thatch and reseeding with a quality encapsulated seed will help fill in bare spots and choke out weeds as well. The tighter the coverage, the leas chance errant things will be able to germinate.

Junior00 said:

Basically it’s an herbicide than keeps the seeds from popping up or sprouting. I usually do spring, early summer and fall. “Weed & Feed” is basically that plus a fertilizer.

Have you had your soil tested? The pH as well as soil temps will tell you a lot about what type of fertilizer will be most applicable. For instance, the typical all purpose 13-13-13 contains equal parts potassium, phosphate and nitrogen. Depending on the soil you may need more of one and less of the others. Core aeration helps greatly because it allows oxygen and the nutrients you apply to reach the roots much easier as well as bypasses the soil compaction that slows the absorption.

Make sense? It is by no means an easy process but diligence will yield results. Raking thatch and reseeding with a quality encapsulated seed will help fill in bare spots and choke out weeds as well. The tighter the coverage, the leas chance errant things will be able to germinate.

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Yes sir it all makes sense.
I know all about the NPK etc. Never bothered to check my soul ph though.
Truth is, I have a "green" thumb, so I understand how most of it works. I'm just not used to killing my "weeds".


The 2,4-D is new to me, but it turns out the stuff I sprayed them with uses it. I'll hit them again in a week or so. I put down some seeds a couple weeks ago as well.