When to apply pre-emergent in North Texas is a question we get a lot at Wells Brothers. Within a month it will be time to apply a pre-emergent herbicide for the lawn. Pre-emergent herbicide does one thing and one thing only stops weed seeds from growing. There is no fertilizer in pre-emergent herbicide.
The synthetic products that Wells Brothers recommends are Gallery for the control of broadleaf weeds and Dimension for the grasses. The 10-pound bag of Gallery will cover 2,000 square feet. This application will last around 4 months. Dimension is available in a 12-pound bag that covers 3,500 square feet and in a 35-pound bag that covers 10,000 square feet. Dimension can be reapplied every 4 weeks.
Also in the synthetic line is an excellent product called “Showcase Specialty Herbicide”. A 50-pound bag of Showcase will cover 21,780 square feet (half an acre). It is designed for professionals with a pull type spreader. Quantities are limited to stock on hand.
The all-natural product is called Corn Gluten Meal. It comes in a powder and granulated form. The powder works faster but is a mess to deal with. The granulated is slower to activate but easier to apply. The application rate for both is 20 pounds per 1,000 square feet.
We get asked a lot about applying pre-emergent and fertilizer at the same time. The answer is you apply one then the other. You do not mix them in the spreader at the same time.
Check out the Wells Brothers easy to read Lawn Product Application Guides. They’re easy to follow schedules for the application of fertilizers and pre-emergent in both Bermuda and St. Augustine Lawns. I hope these will fit your need. Please note that these are guides. Weather conditions such as rain and heat will alter the timing of these products.