At DoMyOwn, we’re receiving a lot of
phone calls on pre-emergents and weeds popping up after people have applied
those pre-emergents. You did a lot of hard work and you’re still seeing weeds
out there, but you’re not alone. When you’re applying those pre-emergents, it’s
going to lessen the weed pressure that you have. The less weeds that you have
in the lawn, the less you’re going to have to spend
on post emergents to eradicate those weeds to get the lawn growing again.
Let’s dive into some reasons why you may be seeing weeds even after applying a
pre-emergent. So pre-emergence work on seeds. They prevent seeds from
germinating in the lawn. Usually you need to get that
pre-emergent down before the soil temperatures reach 50 to 55 degrees. And if you’ve done that you don’t have anything to worry about with summer weeds. Knowing that the pre-emergent that you put down is probably preventing
spring and summertime weeds, rather than those wintertime weeds that you’re
seeing pop up into the lawn. Poa Annua for example would germinate in the fall, but
you may not see it until early spring when the soil temperatures actually
warm up enough. Then it actually starts actively growing and from there you
see the white seed heads as it’s reproducing for the next coming year.
Another example of that would be crabgrass. Crabgrass usually goes to seed around 50 or 55 degrees in the soil temperatures so that’s why it’s real
important to get that pre-emergent down prior to that. And then it grows season
long throughout the spring and summer. Just know that a pre-emergent isn’t
going to work on every type of weed. Some weeds grow through stolons or rhizomes,
or even a bulb that already have an established root system there. A
pre-emergent is going to prevent seeds from actually germinating to establish
that root system. When you’re applying those pre-emergents, make sure that
you’re getting even coverage. You’re double swiping the curbs along concreted areas, because that’s where the soil actually cools off and warms up quicker
in those areas which breaks down that pre-emergent. So when you’re double
swiping the curbs with a liquid application, make sure that you’re going
back over it twice, and if you’re doing it in a granular fashion, make sure that
you have your spreader guard down to put that extra pre-emergent along that edge.
Just know that it takes time for that pre-emergent to work.
It can take a good year of pre-emergents to control those weeds in the lawn. It’s
not going to go away overnight, it didn’t show up overnight, so just be patient,
this is very common. These weeds pop up, but you do need to apply a post-emergent
to take care of those weeds. Knowing the type of weed that you’re dealing with is
key. That way, you can find a selective post-emergent to eradicate those weeds that are currently in your yard. Doing that… if
you have a ton of weeds you may need to do a blanket application over that turf.
If you just have a few weeds here and there, you can do a spot treatment.
When doing a spot application, it’s important to spray the weed itself and
not spray the turf around it. Even though it’s a selective herbicide and it
wouldn’t affect that turf, you can still stunt some of the grass around it, so to
keep it all uniform you want to try and spray the weed itself and not the grass.
We’ve got a lot of resources to help identify those weeds. With a team of
experts in addition to that, you can live chat with us, you can use our guides as
reference, or you can call us and we’ll try to make product recommendations over the phone. So let’s get that lawn weed free! Don’t forget to subscribe and check
out our videos. We appreciate you watching.