Preventing Crabgrass & Goose Grass

Identification

Crabgrass and goosegrass are commonly misidentified. Both are annual grasses that germinate from seed in early to late spring and aggressively spread throughout June and July. They are often mistaken for perennial grasses, which persist in lawns year-round. Unlike annual weeds, most perennial grasses cannot be selectively controlled, making accurate identification essential.

An Ounce of Prevention

Once established, crabgrass and goosegrass are difficult to eliminate without damaging desirable turf. Early intervention is critical. Applying Zamzows Defendz Crabgrass Preventer helps control crabgrass by targeting its tender seedlings. Timing is key—applying the product too early can reduce its effectiveness as it breaks down before all seeds have germinated, while applying too late allows stronger seedlings to survive.

Nature provides a helpful guide: when forsythia bushes bloom—those bright yellow flowering shrubs—it signals that soil temperatures are rising and it’s the right time to apply crabgrass preventer.

To prevent goosegrass, a second application is recommended around mid-May, approximately 90 days after the initial treatment. Unfortunately, there is no distinct visual cue for this timing, so marking your calendar is important.

A Pound of Cure

Soil temperatures can vary significantly between sun and shade, which impacts weed germination. For continued protection throughout the season, especially in lawns with a history of crabgrass issues, consider two applications of crabgrass preventer spaced 60 to 70 days apart.

Though post-emergent options for controlling mature crabgrass exist, they are only about 70% effective and require multiple treatments under strict temperature conditions. Preventative measures remain the most effective strategy for managing crabgrass and goosegrass in your lawn.