Understanding Crabgrass: What It Is and How It Grows in Florida

Crabgrass is a common weed that can be a major nuisance for Florida homeowners. Known for its rapid growth and ability to thrive in hot, humid conditions, crabgrass can quickly take over lawns if not properly managed.

What is Crabgrass?

Crabgrass (Digitaria spp.) is an annual grass that grows low to the ground with wide, flat blades. It’s named for its growth habit, which resembles the sprawling legs of a crab. There are several species of crabgrass, with smooth crabgrass (Digitaria ischaemum) and large crabgrass (Digitaria sanguinalis) being the most common types found in Florida.

How and Where Crabgrass Grows in Florida

Crabgrass thrives in the warm, sunny climate of Florida, making it a persistent problem during the summer months. It typically invades lawns where the grass is thin or where the soil is compacted or poorly drained. Its seeds germinate in late spring or early summer when soil temperatures reach around 55°F, and the weed continues to grow vigorously through the hot summer months.

Crabgrass is particularly fond of:

• Disturbed Areas: Such as bare spots or recently seeded lawns.
• Weak Lawns: Lawns that are poorly maintained, overwatered, or mowed too low are more susceptible to crabgrass invasion.
• Edges and Borders: Often establishes itself along the edges of sidewalks, driveways, and flower beds, where it can easily spread into the lawn.

Preventing and Managing Crabgrass

1. Healthy Lawn Practices: The best defense against crabgrass is maintaining a thick, healthy lawn. Proper mowing, watering, and fertilization practices help create a dense grass cover that can outcompete it.
2. Pre-Emergent Herbicides: Apply a pre-emergent herbicide in early spring before crabgrass seeds germinate. This creates a barrier that prevents the seeds from sprouting.
3. Post-Emergent Treatments: If crabgrass is already present, post-emergent herbicides can be used to target and eliminate the weed. Be sure to follow the product instructions carefully to avoid damaging your lawn.
4. Hand Pulling: For smaller infestations, hand-pulling crabgrass can be effective, especially when the soil is moist. Be sure to remove the entire root to prevent regrowth.

Crabgrass – FAQ

Q: When does crabgrass typically germinate in Florida?
A: Crabgrass seeds usually germinate in late spring or early summer when soil temperatures reach about 55°F. This is why applying pre-emergent herbicides early in the season is crucial for prevention.

Q: How can I prevent crabgrass from taking over my lawn?
A: Maintain a thick, healthy lawn through proper mowing, watering, and fertilization. Applying pre-emergent herbicides in early spring can also help prevent the seeds from germinating.

Q: Can crabgrass be removed by hand?
A: Yes, hand-pulling can be effective for small patches, especially when the soil is moist. Be sure to remove the entire root to prevent regrowth.

Q: Is crabgrass more common in certain areas of my lawn?
A: It often invades thin, weak areas of the lawn, as well as edges along sidewalks, driveways, and flower beds where grass coverage is sparse.

Q: What type of herbicide is best for crabgrass control?
A: Pre-emergent herbicides are best for preventing crabgrass, while post-emergent herbicides can be used to treat existing infestations. Always follow the product’s instructions to avoid damaging your lawn.

Crabgrass can be a challenging weed to manage, but with proper lawn care practices and timely treatments, you can keep it under control. Regular monitoring and early intervention are key to preventing it from taking over your lawn.

Lawn Care Extraordinaire has been serving the Venice, Sarasota, and Bradenton communities since 1979, bringing over 48 years of combined experience in lawn care and pest control. We specialize in a wide range of services, including lawn fertilization, weed control, pest management, and tree and shrub care. Our commitment to quality service and deep community roots ensure that your lawn stays healthy and beautiful year-round. For more information or to schedule a service.