The Fall Fertilization Window in North Texas
Fall fertilization is the most underrated application of the year. Homeowners obsess over spring green-up and summer color, and then stop feeding the lawn in August. That’s the opposite of what a warm-season lawn actually needs. The work you do in fall decides what the lawn looks like in April.
September is the recovery window.
By late August the lawn has been through 60 days of heat stress. A mid-September fertilization at a moderate nitrogen rate pushes a recovery flush of growth before the lawn begins its fall slowdown. This is the application that fills in the thin spots created by summer.
Use a balanced N-P-K blend, a pure nitrogen shot this late creates soft growth that’s vulnerable to first frost.
October/November is the winterizer.
Six to eight weeks after the September application, a potassium-heavy winterizer goes down. The N rate drops (or disappears). The K rate is high. The goal is root health and cold tolerance, not top growth.
This one application does more to improve the following spring’s green-up than anything you can do in March. The plant stores energy in its crown and roots over winter, and a well-fed crown comes out of dormancy earlier, denser, and greener.
Don’t skip the fall pre-emergent.
Fall fertilization is often paired with fall pre-emergent, timed to mid-September through mid-October. The fertilizer feeds the warm-season turf going into dormancy. The pre-emergent stops cool-season weeds (Poa annua, henbit, chickweed) from establishing during the lawn’s weakest period.
Skipping either one is leaving obvious value on the table.
“The best-looking lawn in Rockwall in April was fed correctly in October. That’s the whole trick.”
— Chris Rather, CGCS
See Rather Green’s fertilization program →
Or call Chris directly at 972-649-9912 for a free lawn evaluation.
