Crabgrass Life Cycle

Of all lawn weeds, crabgrass is the most common and bothersome. Crabgrass is probably the only weed that everyone hates! Even though it is a grass, crabgrass doesn’t blend in with lawn grasses in color, habit or texture and can be so aggressive that it out competes the good turf grass. Understanding the life cycle of crabgrass will help you deal with it more effectively.

What is crabgrass and how does it get in my lawn?

Crabgrass is an annual grassy weed with broad blades, rough texture and a lighter green color. Germinating from seed each spring when soil temps reach 50° to 55°F, crabgrass plants mature and produce seeds.  The crabgrass plant is killed by frost in late autumn, leaving behind seed and a bare spot for the weeds to germinate the following spring.  The cycle continues, weed seeds carry in the wind, move by rainfall and settle into bare spots ready to multiply in warmer weather.

What does crabgrass look like?

Crabgrass is a low growing weed with lots of stems that form flat clumps. Clumps spread out and root along the stems at joints. The blades are coarse, pointed and short. As crabgrass matures, they send up branched seed heads that have thousands of crabgrass seeds. Looking out over your yard, crabgrass shows up as patches of much lighter green than the rest of your turf lawn.

What is the best way to kill crabgrass?

The best way to eliminate crabgrass in your lawn is to prevent crabgrass from germinating. Prevent crabgrass germination with two applications of Prevent®, a crabgrass pre-emergent. One application of Prevent goes down in early spring before crabgrass seeds can germinate and a second booster shot of Prevent will go down 10-12 weeks later.

I found crabgrass in my lawn. How do I kill crabgrass?

Crabgrass and foxtail that have escaped the control from Prevent like Houdini from his straight jacket can now be killed with Uncle’s Q-Bomb products. Post emergent crabgrass herbicide, Uncle’s Q-Bomb products will control a wide variety of broadleaf and grass weeds, including: crabgrass, foxtail, clover, dandelion, black medic, english daisy, morning glory, dollarweed, speedwell, torpedo grass, barnyardgrass, bindweed, signal grass, and wild violet. Use as broadcast or spot treatments to actively growing weeds as a post emergence. 

Recommended applications for best post-emergence crabgrass control.

Uncle’s Q-Bomb products are most effective when applied to newly germinated 1-2 leaf crabgrass, to one tillercrabgrass and when crabgrass has matured to five tillers or greater. Do not mow 2 days before or after a Q-Bomb application. If soil is dry, irrigate turf grass in advance for best results. No rainfall or water for 24 hours after application. Apply ½ inch of water 2-7 days after application, if no rainfall has occurred during this time period.

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