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Our 25+ year old lawn needs replacing. The grass company said to mow it, fertilize it, and when the weeds and grass are 1" tall, spray it with RoundUp super concentrate mix, using 2.5 oz/gallon/300 sq. ft.

Three to seven days later, shave off the grass and then do the usual things to place down sod.

I want to use marker dye with the RoundUp, but was told only certain blue dyes with no ruin the RoundUo effectiveness. What are the names of these blue dyes and where to buy them?

The manufactures of RoundUp is probably the best people to ask this.

StarTech said:

The manufactures of RoundUp is probably the best people to ask this.

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Unfortunately two reps (Scott's) said they do not deal or know about marker dyes.

MowerMark said:

Our 25+ year old lawn needs replacing. The grass company said to mow it, fertilize it, and when the weeds and grass are 1" tall, spray it with RoundUp super concentrate mix, using 2.5 oz/gallon/300 sq. ft.

Three to seven days later, shave off the grass and then do the usual things to place down sod.

I want to use marker dye with the RoundUp, but was told only certain blue dyes with no ruin the RoundUo effectiveness. What are the names of these blue dyes and where to buy them?

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How can you prevent a super concentrate from affecting the new turf if it rains after application?

Is the lawn flat? If it is, why not use a weed & feed/pre-emergent, let that do its job and overseed, to let the new grass crowd the weeds out?

I don't understand your first sentence. The lawn is flat, yes. There are at least four different grasses and three different weeds. Nimblewill is now dormant. Strong roots from a nearby hedge are invading 20% the lawn. Soil is hard/compressed in areas. About 20% of the lawn is not even in the ground! It grows like an above ground trampoline. There are mole tunnels.

Decided to proceed with RU a few days ago... stupid me. Nimblewill won't be destroyed by RU since it's dormant. My choices now are:

1. Proceed with lawn replacement and installation of a screen 1-2" below the grass, and hope that shaving off the lawn eliminates most or all of the dormant nimble. Follow Gym123's advice if weeds appear.
2. Leave the dead lawn and see if more weeds appear and replace the lawn when the weather is warmer.

Any other suggestions?

Paint for lawn stripes is available- why does it need to be blue?

I have seen lawns removed, tilled, rolled and a layer of looser soil distributed on top for seeding or sod. The new roots will loosen the bottom layer, as long as it can't become too dry. I don't know where you live or the soil, but my yard is very hard and has a lot of clay under the soil.

I found this link referring to Nimblewill and it shows that Roundup works, as well as another called 'Tenacity'.

I’ve been using a product call Strike-3, formerly Triplet, for the last ten years and have found that it kills only the we end, never the grass. Must be careful as it will also take out the betterhalfs flowers and lower portions of evergreens. Follow directions. Last year neighbor put in a new lawn. This year I sprayed it and by the end of the summer it looked so good he treated me and my wife to a full BBQ dinner with drinks. Great evening. Don’t be scared of sticker shock, this stuff works. I treat my lawn each year, no thistle, dandelion, chickweed, creeping charlie. Only thing it take multiple year to kill is broadleaf.

Gym123 said:

Paint for lawn stripes is available- why does it need to be blue?

I have seen lawns removed, tilled, rolled and a layer of looser soil distributed on top for seeding or sod. The new roots will loosen the bottom layer, as long as it can't become too dry. I don't know where you live or the soil, but my yard is very hard and has a lot of clay under the soil.ave up this year

I found this link referring to Nimblewill and it shows that Roundup works, as well as another called 'Tenacity'.

How do I control nimblewill in my lawn?

yardandgarden.extension.iastate.edu

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Thank you, Gym. Yes, for six years I've applied Tenacity 3x/growing season. But the last two seasons even double strength applications made no difference, even though there was mild blanching of the entire grass. So I gave me this year not knowing of anything except Tenacity.

It is hoped that using a sod cutter will remove most or all of the dormant parts of Nimble and other enemies.

Rivets said:

I’ve been using a product call Strike-3, formerly Triplet, for the last ten years and have found that it kills only the we end, never the grass. Must be careful as it will also take out the betterhalfs flowers and lower portions of evergreens. Follow directions. Last year neighbor put in a new lawn. This year I sprayed it and by the end of the summer it looked so good he treated me and my wife to a full BBQ dinner with drinks. Great evening. Don’t be scared of sticker shock, this stuff works. I treat my lawn each year, no thistle, dandelion, chickweed, creeping charlie. Only thing it take multiple year to kill is broadleaf.

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Rivets, what does "we end" mean? Thank you.

This website features Strike-3 for sale, and also has a weed guide: https://www.pedchem.com/products/wf-strike-three-herbicide-weed-killer?variant=1268601636

BUT there is no listing for nimblewill so it seems Strike-3 will not control Nimble.

From what I read nibble weed is hard to control. Never tried here but it might be a little more sensitive to Roundup than your regular grasses so try spraying at a reduce strength that how I control Sage Grass here. I used the Roundup as a growth regulator here so it is spray at half strength but it does take out the Sage Grass and leaves the the hardy multi-year grasses.

You also may want to use a pre-emergent to prevent seeds from spouting as that takes care of the crab grasses here.

Don’t you understand that spellcheck changes weeds to “we end”. Sorry about that.

MowerMark said:

Thank you, Gym. Yes, for six years I've applied Tenacity 3x/growing season. But the last two seasons even double strength applications made no difference, even though there was mild blanching of the entire grass. So I gave me this year not knowing of anything except Tenacity.

It is hoped that using a sod cutter will remove most or all of the dormant parts of Nimble and other enemies.

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All I can say is, I hope that stuff never makes it into my lawn.

Gym123 said:

All I can say is, I hope that stuff never makes it into my lawn.

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Which "stuff" ?

StarTech said:

From what I read nibble weed is hard to control. Never tried here but it might be a little more sensitive to Roundup than your regular grasses so try spraying at a reduce strength that how I control Sage Grass here. I used the Roundup as a growth regulator here so it is spray at half strength but it does take out the Sage Grass and leaves the the hardy multi-year grasses.

You also may want to use a pre-emergent to prevent seeds from spouting as that takes care of the crab grasses here.

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What are your favorite pre-emergents?

MowerMark said:

Which "stuff" ?

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The Nimblewill.

A neighbor gave me a new bottle of Barricade and it is alleged to be a pre-emergent stopping weeds for a year. Anyone here have experience with it?