There are a few things you should ask a weed service company before hiring to ensure you’re choosing the best professional for the job:

• How often will you apply herbicides?

• Do you include any spot treatments or manual weed removal in your pricing?

• Do you offer pet-safe and kid-safe herbicides?

• What other lawn services can you provide?

• Do you offer any kind of guarantee for the work performed?

• Are you properly licensed and fully insured?

• Do you have any customer references I could speak with?

Landscape fabric and a few inches of gravel should be enough to put under a deck to prevent weeds from flourishing. If you don’t want to invest the time and money on a project like this, you can regularly spray the area underneath your deck to kill weeds.

Mowing your grass regularly, especially if you’re mowing close to the ground, can help kill Johnsongrass. Frequent mowing helps limit the spread of Johnsongrass and can even deplete carbohydrate reserves in rhizomes over time. The more time you leave in between mowing, the more likely Johnsongrass is to regrow and take over your lawn. 

Some of the particular herbicides that work best to get rid of nut grass without killing the grass include Halosulfuron-methyl, mesotrione, sulfentrazone, and metsulfuron. A herbicide like glyphosate would kill nutgrass, but it will kill nearby plants, too.