What Dallisgrass Looks Like
Dallisgrass grows in coarse, circular clumps that are usually wider and taller than the surrounding lawn. It has broad grass blades and produces tall seed stalks with branching seed heads. The seed heads may show dark or black-looking spots, making the weed easy to notice when it is mature.
Why It Spreads
Dallisgrass often appears in thin, weak, compacted, or poorly maintained turf. It spreads by seed and can also survive through its crown and short underground growth. Because it is perennial, it does not naturally die out at the end of the season like crabgrass or goosegrass.
How to Prevent It
Prevention is mainly about keeping the lawn thick and reducing bare or weak areas where dallisgrass can establish. Proper mowing height, fertilization, watering, aeration where appropriate, and repairing thin spots can help reduce future pressure. Preventing seed heads from maturing can also help slow spread.
Best timing: Spring through fall by thickening the lawn and removing seed heads before they mature.
How to Control It
Dallisgrass is difficult to selectively control in many lawns, and options depend heavily on turf type and product label. Small clumps may be physically removed by digging out the crown and roots. For herbicide control, use only products labeled for dallisgrass and your specific lawn type. Multiple applications or spot renovation may be needed. Always read and follow the product label.
Best timing: Late spring through summer when dallisgrass is actively growing, depending on labeled product options.
Recommended Solution
Step 1: Confirm the weed is dallisgrass by looking for coarse clumps, broad blades, and tall seed stalks with branching seed heads.
Step 2: Identify your lawn type before choosing any herbicide, because dallisgrass control options are limited and turf-specific.
Step 3: For small patches, dig out the entire clump, including the crown and root system, then repair the bare spot.
Step 4: For larger patches, use only a product labeled for dallisgrass and your specific turfgrass.
Step 5: Expect repeat treatments or spot renovation for established clumps.
Step 6: Mow before seed heads mature and improve thin areas with proper mowing, fertilizer, watering, and soil care.
