When fighting grassy weeds, you must wait a little longer to plant your grass seed, whether you’re seeding your entire lawn, overseeding or treating bare patches. With the Weed B Gone Plus Crabgrass Control, wait at least four weeks to plant seed. Because this is specially formulated to stop grassy weed seeds from germinating, it also can stop your regular grass seed from growing.
How long you must wait to plant grass seed after treating your lawn with a Scotts Weed B Gon product depends on which product you use. When fighting broadleaf weeds such as dandelions with the basic Weed B Gon weed killer, wait at least three weeks to sow your grass seed. This product specifically targets the seeds of broadleaf weeds, but it can stop or slow down your grass seed’s germination as well.
Although you can’t spread grass seed at the same time you spray your lawn with Weed B Gon, other options exist to treat your lawn for weeds at the same time you plant seed. These typically come in the form of weed and feed products that offer fertilizer along with the herbicide. Look for products specifically designed to be spread with grass seed, often noted on the label as a starter fertilizer plus weed control.
Weed and Seed Together
Keeping your lawn weed-free is a constant battle that uses cultural practices, such as deep waterings, to encourage grass to choke out weeds, as well as chemical products, such as using Weed B Gon, to kill weeds before they start. These chemicals often kill grass seed as well, keeping it from germinating along with the weed seeds, so wait before you sow your seed.
When you’ve already planted your grass seed and want to apply a pre-emergent herbicide to keep weeds from competing with your new grass for water and nutrients, have a little patience. Applying a weed-control product such as Weed B Gon too soon can kill young grass. Instead, wait until you’ve mowed the new grass at least three times before using herbicides on your lawn.
I just sprayed today, and it’s supposed to rain in 2 days (and a few days in a row). I was hoping I could toss down the grass seed tomorrow before rain, but I wasn’t sure if that’s too soon, or if it matters with this particular chemical.
I’m not concerned about getting it perfect. If 10% of the seed I put down comes up and starts to spread over the years, I’d consider that a win. Every amount above that certainly welcome, but.
Can I over-plant grass seed a day after spraying Ortho Weed B Gon? If not, how long do I need to wait (and why)?
Thank you for the detailed and prompt reply. I am going to drop some tomorrow night.
Bonus S Weed & Feed is for St. Augustine, Zoysia and Centipede lawns (which all grow in your area). It is not for Bermuda or Fescue lawns. Bermuda grows well in your area, however you are probably too far south for a good fescue lawn (except maybe in shade). Now for your question. Per the info on the label you can not seed any kind of grass for 6 months after putting down Bonus S. This would put you into a less than ideal time of year to seed Bermuda. Fescue can be seeded that time of year, however my experience with our Heat-Tolerant Blue blend is further north (like the Atlanta area). Sounds like you have good growing conditions for Bermuda or Zoysia.
Bermuda likes sunny areas, so if you have shade the grass will be thinner. St. Augustinegrass can tolerate more shade. This is a good time to seed Bermuda. Put down some Bermuda seed and some Starter Lawn Food and don’t let the area dry out for long periods of time. If you have only a few bare spots to take care of, the Scotts EZ Seed with Bermudagrass is a good way to go, as the mulch helps to keep the seed moist. Stay away from the weed controls in the areas you are seeding. Feed again with Turf Builder for Southern Lawns a couple of times this summer. Once your new grass has been mowed 4 times, you can spray your weeds with Ortho Weed B Gon MAX plus Crabgrass Killer, however pick a day when the mid day temps are not in the 90’s or above.
You need to decide whether you should kill off everything and start over or to improve what you have. Since the kill off everything and start over option is best done in Late Aug/Early Sept, you have two options. The first option is to nothing till late summer when you start the process by killing your lawn with Roundup. The second option, and the approach I have seen others take in your situation is to feed your lawn a few times to see how much good grass you have (you may be surprised). Then make a decision on what to do next in late Summer. If you decide to do this, feed now with Turf Builder with Halts Crabgrass Preventer and then again in about 6 weeks with Turf Builder Weed & Feed. You can then decide if you want to keep improving your existing lawn by feeding two more times in fall or to kill it off and start over with new grass. I will be happy to guide you with the proper steps… check back with me around mid August.
So should I use the Ortho first and then do the Turf Builder? How long in between the spraying of Ortho to spreading the TB?