I mowed the lawn this week for the first time this season and that’s got me thinking about lawn maintenance. Indiana was very hot and extremely dry last year, which made for crabgrass proliferation. Our lawn was definitely affected and to help control it this year, I am applying a Preemergence Herbicide. The word “Preemergence” is key here. The prefix “pre” literally means that this type of herbicide must be applied BEFORE the crabgrass emerges.
I’m using a product by Scott’s called Halts. You can find this as well as many other products at your local hardware store. It’s in granular form, so I’ll simply dump the contents into the mini spreader and walk it over the grass. As the wheels turn, the product is broadcast onto the yard with even coverage.
So how does one know when germination will occur?
Check with your local extension office to see the predicted crabgrass germination date for your area. Remember that preemergence herbicides must be applied at least two weeks prior to these dates to control crabgrass. In Indianapolis, the date is April 21– now count back two weeks and that’s when you should apply the product. Many of these products can be applied as early as mid March. I think April 1st is good and easy to remember.
There are other seasonal indicators for crabgrass germination. If you see any of these, it’s probably to late for a Preemergence herbicide.
- When redbuds are in full bloom
- Before lilacs bloom
- Before forsythia blooms drop
- Before dandelions reach puff ball stage
All is not lost though. If you can’t get to it before germination occurs, you’ll have to wait until it is visible and apply at Postemergence herbicide. Postemergence herbicides control crabgrass after it has emerged and are most successful on small crabgrass plants. These types of products are a bit more difficult to use. Check with your local hardware store or garden center for product recommendations. And always remember to read the label before using any product.