If you use straight round up (only glyphosate active ingredient), you can spray and seed the same day.

 

Would Roundup for Lawns 3 allow reseeding right away? The label says to wait 4 weeks.

Longer background: We had tried spraying with Bayer advanced season long weed control, but the barnyard grass grew through that. Online research led to the conclusion that we needed something with quinclorac in it, hence roundup for lawns 3, which also has MCPA, dicamba, and sulfentrazone

 

No. Round up for lawn is a different product and I don't think it will kill barnyard. This product is very similar to weed by gon.

The regular round up (glyphosate), is a non selective killer. It kills anything, grass or weeds. You can spot kill the weeds and seed at the same time.

 

If the label says to wait 4 weeks, then you have to wait 4 weeks.

Straight glyphosate - generic or roundup - with no other active ingredients will allow you to spray and seed at the same time. This will kill the barnyard grass.

 

Yes, sorry I should have clarified earlier. I did try Roundup for lawns 1 (the spot treatment), with the same listed active ingredients as RUFL 3, and it did kill barnyard grass in a few areas. In both the front and backyards, though, the barnyard grass and other weeds are fairly enmeshed with the grass, so rather than do 100+ spot treatments (how I would need to apply glyphosate, to not kill the current lawn, correct?), I was looking for a spray option that would leave my grass alone but kill the others.

To clarify, the lawn is currently about 40% quality grass, 30% grass with a few scattered weeds, and 30% clay/weeds with some grass still in good evidence. I have neighbors who are starting over on their lawn, but I do not think we are there.

I do understand that I will have to wait to reseed if I use RUFL 3, I was more wondering whether it would be worthwhile to reseed without taking care of the weeds first (and using RUFL3 after a few weeks according to the label, probably in mid-October), or whether reseeding in mid-October after using RUFL3 would be better. Or if reseeding in the spring after taking care of the weeds now would be the preferred way to go. Or if there is some obvious path I should attempt that my cursory internet searches have not revealed.

Thanks for your timely replies.

John

 

Mid October is too late to seed. Spring is an option but not ideal. Next Fall (mid to late August), to be candid, is the best option.

If the barnyard grass is that wide spread, a blanket application Is required. But this puts you into mid to late October for seeding. I would take care of the weeds now and put a plan together for seeding next August.

Seeding projects can't be rushed.

 

Yes, that is what I figured. Would there be any benefit to the lawn by spraying now, but also adding top soil soon after so that current grass can grow/spread a bit?

 

Adding soil isn't going to help the good grass grow/spread. Plus any soil you bring in could have weed seeds, potentially giving you a larger problem.

I would take care of the weed problem this fall and feed with nitrogen weekly; which will help any KBG you have spread and fill in a bit.

The other option, as mentioned above, is to get regular Roundup (with glyphosate as the only ingredient) and spray and seed the same day. You will likely not get a complete kill of all weeds, but you should get the majority of them.

 

Am I the only one who thinks adding an inch or two of topsoil is overrated? I've heard so many people here in northeast Ohio say we have bad clay soil, but I don't think it's true. My soil composition is clay-loam and I have a CEC of 11.6. I feel like adding 1-2" of topsoil prior to seeding a whole yard is pointless.