St. Augustine Seasonal Care Calendar
Winter: minimal care, lawn may stay semi-green in south Florida but is dormant in zones 8-9. Do NOT fertilize. Mow only if needed. Apply pre-emergent for winter weeds if not done in late fall. Early Spring: watch for green-up — first fertilizer application after lawn is 50%+ green. Apply pre-emergent before soil hits 55°F. Begin Large Patch fungicide if temps are 60-75°F. Spring/Summer: peak growth, mow weekly at proper height, fertilize every 6-8 weeks with slow-release N. Monitor for chinch bugs in hot sunny areas and gray leaf spot during humid stretches. Reduce nitrogen June through August. Fall: apply Large Patch preventive fungicide when soil temps drop to 75°F. Last fertilizer 6 weeks before first expected frost. Apply potassium (0-0-62) for winter hardiness in zones 8-9.
Frequently Asked Questions
Does St. Augustine go dormant in winter?
In north Florida and the Gulf Coast, yes — it goes dormant and turns brown. In south Florida, it may stay semi-green year-round. Never fertilize dormant St. Augustine.
When should I start fertilizing in spring?
Wait until the lawn is at least 50% green and soil temps are consistently above 65°F. Fertilizing too early wastes product and can promote weed growth before the grass can compete.
What is the most important fall task for St. Augustine?
Apply preventive fungicide when soil temps drop to 75°F. Large Patch is the biggest fall threat. Also reduce nitrogen and mowing frequency as growth slows.
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