Is it okay to spray broadleaf herbicide on new standing grass?

Question

The fescue seed has been down now for 3 weeks.

It has come up and has already been mown once or twice now.

I want to spray for the broad leaf weeds now in the lawn with Ortho weed b gone Max concentrate.

Will it be okay?

How much longer should i wait, if not?

I am afraid if I wait too long here in Tennessee that it will be too cool at the end of this month for it to work. Last week we had temperatures up in the upper 80's and lows in the 60's, but this week it will get down to the mid 70's for highs, and low 50's for lows.


Thanks for your answers!

Answer 1

Best not follow foo's advice, if you use Round-up it will kill everything including the grass!!!!

Its probably too soon to spray your lawn, most manufactures of selective herbicides recommend 4-6 weeks before you spray. So best wait a few more weeks or until spring. I don't know which chemicals are available in the States but here in the UK the following chemicals are available;

>2,4-D
>Mecoprop-P
>Dicamba (probably too strong for a new lawn)
>fluroxypyr
>clopyralid
>MCPA

These names listed are the active ingredients, and not the trade names, trade names may include Bio-lawn and Verdone.

Best of luck, but what ever you do don't use Round-up!!
Rups

Answer 2

I'm in Tennessee too and I'm in the same boat. I'm going to wait for about another month to do any weed and feed on the lawn. It's better to give the new grass a little more time to mature before you start hitting it with chemicals.

And by all means, don't do what the first answerer said and use glyphosphate. That's Roundup and you'll just kill everything, including your new grass. I think he may have read your question wrong and that you were starting from scratch instead of just trying to kill the weeds in a newly seeded lawn.

Answer 3

read the instructions, very carefully, some broad leaf herbicides will kill fescue's, use the recommended application, do not over dose your grass.Rather than weed-be gone or round -up, look into something like MSMA, it's much easer on grass and still deadly to broad leaf weeds.
good luck

Answer 4

You'd be best to use Glyphosate - probably Roundup as its the most established well know. Its the perfect time of year to use it and it breaks up on contact with soil so its safe to use.

Answer 5

you do not spray herbicides on new grass,,,,, you must wait for at least 6 weeks, for it to establish itself, or you will kill it.....try a product called Tupersan.. it doesn't kill the new growth