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*The Angi rating for Weed Maintenance companies in Monrovia, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Weed Maintenance needs.

*The HomeAdvisor rating for Weed Maintenance companies in Monrovia, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Weed Maintenance needs.

Last update on January 25, 2026

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Weed Services questions, answered by experts

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. 

You should add 1 to 4 inches of mulch, depending on your garden type and needs. Keep in mind that no amount of mulch can completely prevent weeds, but a heavier coverage (closer to 4 inches) can suppress weeds enough that you are only seeing them sprout every few weeks. Finer mulch prevents weeds more effectively than large mulch, so if you’re using mulched leaves or shredded bark, 1 to 2 inches will likely suffice, while 3 to 4 inches is best for larger mulch, like bark chips or straw.

The main problem with crabgrass is that it produces thousands of seeds that can remain dormant until the following season. To get rid of it, you have to remove existing plants before they have a chance to spread seeds and stop old seeds from germinating.

Each season’s climate influences approaches needed for effective suppression.

Purchase a selective herbicide that targets clover and similar weeds but doesn't take out your grass. You can also keep it from growing with corn meal gluten or remove clover from your lawn manually at the start of the season as part of your lawn maintenance checklist.

The Monrovia, CA homeowners’ guide to weed maintenance services

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