5 Best Weed and Feed for St Augustine 2025 – Tested & Reviewed

The Fertilome St. Augustine Weed & Feed earns our top recommendation because it's specifically engineered for the unique needs of St Augustine grass. Unlike generic formulations that attempt to work on all grass types, this product recognizes that St Augustine has different nutritional requirements and weed pressure challenges than Northern grasses.

The 15-0-4 fertilizer ratio provides the optimal nitrogen boost that St Augustine craves for thick, carpet-like growth, while the zero phosphorus content prevents the nutrient imbalances that can stress warm-season grasses. The dual pre and post-emergent herbicide system tackles both existing weeds and prevents new ones from germinating throughout the growing season.

The Scotts Triple Action1 represents the premium approach to comprehensive lawn care, combining three essential functions into one application. The formula uses a sophisticated blend of pendimethalin for pre-emergent control, 2,4-D and dicamba for post-emergent broadleaf elimination, plus balanced fertilization to promote thick grass growth that naturally crowds out weeds.

What sets this apart from basic weed and feed products is the extended 4-month crabgrass prevention window and the ability to tackle both existing weeds and prevent future germination simultaneously. The large 33.94-pound bag size makes it economical for substantial properties while ensuring consistent application rates.

Scotts Halts takes a focused approach that many lawn care experts prefer: do one thing exceptionally well rather than compromise across multiple functions. This pre-emergent specialist prevents crabgrass, foxtail, spurge, barnyardgrass, and other grassy weeds from ever germinating, which is far more effective than trying to kill established weeds later in the season.

The weather-resistant formula means you don't have to worry about perfect timing around rain or temperature fluctuations. Once applied to dry grass, it creates a chemical barrier in the soil that remains effective regardless of subsequent weather conditions, providing season-long protection when applied correctly.

This specialized formula solves the classic lawn care dilemma: how to prevent weeds without killing new grass seedlings. Traditional pre-emergent herbicides prevent all seed germination, including the grass you want to grow. Scotts Built For Seeding uses selective chemistry that targets weed seeds while allowing desirable grass varieties to establish successfully.

The 6-week protection window aligns perfectly with the critical establishment period for new grass. During this vulnerable time, the formula provides nutrition to accelerate root development and shoot growth while creating an invisible barrier against common weeds like dandelions, crabgrass, and clover that would otherwise compete with young grass.

The EZ Feed Plus represents the liquid approach to weed and feed, offering immediate contact action that granular products can't match. The hose-end sprayer system ensures even distribution and proper dilution, eliminating the guesswork of mixing concentrates or calibrating spreaders for granular applications.

Liquid formulations provide faster uptake through leaf surfaces, which explains why users see weed curling within days rather than weeks. The fertilizer component is immediately available to grass roots, providing that quick green-up effect that makes lawns look healthier almost immediately after application.