Each window lists what to do and when, tuned to Orlando's climate and St. Augustinegrass. Timing runs on soil temperature, so treat these as guides and confirm with the current soil temp.
Feb - early MarSpring pre-emergent for crabgrass and summer annuals once daytime temps hold 65-70°F for four to five days running. Do not fertilize yet — the grass is not growing enough to use it, and it will just leach through the sand.
Mar - AprFirst feeding once the lawn is fully green and growing, using slow-release nitrogen. Start scouting for chinch bugs on sunny edges and along driveways as it warms.
May - JunRaise St. Augustine to 3.5-4 inches and mow often. Chinch bug damage peaks now — look for spreading yellow-to-brown patches in the hottest, driest spots before assuming it is drought.
Jun - SepRainy season. Dollarweed, nutsedge, doveweed, and chamberbitter take off, and brown patch shows up in the humidity. Many Central Florida counties restrict nitrogen and phosphorus in these months — check your local ordinance before feeding.
Sep - OctLast feeding of the year while the grass is still actively growing. Fall pre-emergent as soil temps fall through 70°F to stop Poa annua and winter broadleaf weeds.
Nov - JanGrowth stalls and inland frost can brown the lawn — that is dormancy, not death, so do not try to fix it with fertilizer. Stop feeding, mow only as needed, and cut watering back sharply.