I am self taught. Wait til the forsythias bloom. If you do it too early it just doesn't last as long. Those yellow bushes all around in late April early May, I do crabgrass preventer on the south side in last half of April most years north side in Early to Mid May. You wont get it perfect every year its an art and that's what makes it fun for me. forsythia below.
Fertilizing my lawn for initial spring application
- Thread starter spierceisu
- Start date
My pre-emergent won't be going down for at least another week. Earliest I have put my down (Homeowner since 2017) is Easter. Latest is the last week of April.
I thought that was for seeding, you can put pre-emergent earlier from what I understand.
Soil Temparature Maps | GreenCast | Syngenta
Add in your zip code. If the ground temps are above 50 for several days in a row, it is time to spread.
A week out for those in the metro
If I put crabgrass preventer down today and ground temp goes above 50-55 degrees before it rains does that negate the preemerge? So ? Do I need to water to activate ?Soil Temparature Maps | GreenCast | Syngenta
www.greencastonline.com
Add in your zip code. If the ground temps are above 50 for several days in a row, it is time to spread.
View attachment 111494
A week out for those in the metro
My yard is in desperate need of grass seed in many spots due to past construction damage, yet also want to get the initial fertilizer on. In which order and time separation would you put them on? Should I wait until next week when it'll be consistently warmer?
Am I good to dethatch now?Soil Temparature Maps | GreenCast | Syngenta
Add in your zip code. If the ground temps are above 50 for several days in a row, it is time to spread.
View attachment 111494
A week out for those in the metro
You will still get some benefit, it just may be reduced a bit. Not all of the weed seed will germinate as soon as the ground hits 55. You're still better off getting pre-emergent down slightly late than not at all, just don't be surprised if you do happen to see a few escape.
I'd think you want to wait until you've mowed a time or two. Dethatching can be pretty tough on the grass and I wouldn't want to stress it that hard while its coming out of dormancy.
IEM :: ISU Soil Moisture County Temperature Estimates
Iowa Environmental Mesonet of Iowa State University
Here is the soil temp site I use if anyone is interested. Easy to read.
Makes sense. Do guys wait until they dethatch for crab grass preventer though? Seems like a long time to wait to apply that after a couple mowings.
I'd time them separately. After the pre-emergent is watered in it binds to the soil, so dethatching later shouldn't have any impact on it's efficacy.
4 inch test is better for corn and soy. 2 inch is better for grass IMO.IEM :: ISU Soil Moisture County Temperature Estimates
Iowa Environmental Mesonet of Iowa State Universitymesonet.agron.iastate.edu
Here is the soil temp site I use if anyone is interested. Easy to read.
Soil Temparature Maps | GreenCast | Syngenta
I've never detatched my lawn. Just aerating in the fall. Maybe someone else has experience.
I would agree that wrecking your lawn in the first weeks of growth may do a lot of harm.. But I'm just a DIY/Youtube watcher, no biology/horticulture degree
Sweet. Thanks. Are you an agronomist?
I wonder if I can just put the crab grass preventer down now then. Or maybe that would lead me to just having to do it again in May since it might not last as long.
