☀️ Bermuda Grass Calculator — Seed, Fertilizer, Water & Full Care Guide (2025/2026)

For a new lawn: 1–2 lbs of hulled (dehulled) Bermuda seed per 1,000 sq ft. Hulled seed germinates much faster (7–14 days) than unhulled (28–42 days). For overseeding thin Bermuda: 0.5–1 lb/1,000 sq ft. For winter ryegrass overseeding: 8–10 lbs annual ryegrass or 6–8 lbs perennial ryegrass per 1,000 sq ft in October when daytime temps drop below 70°F.

Bermuda's fertilization window is April–August. Begin fertilizing after at least 50% of the lawn has greened up and soil temps are consistently above 60°F (typically late April in Zone 7, early April in Zone 8–9). Apply 1 lb N/1,000 sq ft every 4–6 weeks through the active growing season. Stop all nitrogen by September 1 in Zone 7 or September 15 in Zone 8–9 — late nitrogen pushes tender growth vulnerable to frost damage.

Hybrid Bermuda (TifTuf, Tifway 419, Celebration): 0.5–1 inch. Common Bermuda: 1–1.5 inches. Rotary mowers work well at 1–1.5 inches; reel mowers are needed for 0.5–0.75 inch heights. Scalp-mow once in early spring (one pass at 0.5–1 inch lower than normal) to remove dormant thatch and speed green-up. Never remove more than one-third of the blade in a single mowing.

Overseed Bermuda with annual or perennial ryegrass in October–November when daytime temps consistently drop below 70°F. Mow Bermuda short (0.5–0.75 inch), scalp and bag clippings to allow seed-to-soil contact. Apply 8–10 lbs annual ryegrass or 6–8 lbs perennial ryegrass per 1,000 sq ft. Seed germinates in 7–10 days with consistent moisture. Ryegrass thins out as Bermuda resumes growth in spring. This is purely cosmetic — ryegrass provides green color through winter dormancy.

Bermuda goes dormant when soil temperatures drop below 55°F consistently, and air temps fall below 50°F regularly. In Zone 7: typically October–November through March–April. In Zone 8–9: December–February or shorter. In Zone 10: may not fully go dormant. Dormant Bermuda appears brown and straw-colored but is alive and healthy. Green-up occurs in spring when soil temps return to 55–60°F.

Bermuda needs nitrogen-rich fertilization during its growing season (April–August). Best products: (1) Lesco 24-2-11 Professional Fertilizer; (2) The Andersons 16-0-8 with Humic; (3) Scotts Turf Builder Southern Lawn Food. Use slow-release nitrogen products to reduce flush growth and disease. Iron supplements (chelated iron or milorganite) enhance deep green color. Avoid high phosphorus unless soil test indicates deficiency.

Spring dead spot (SDS) is caused by the fungus Ophiosphaerella spp. and is most severe in Zone 7–8 lawns in transition zones. Prevention: (1) reduce thatch with annual dethatching/vertical mowing; (2) maintain soil pH 6.0–6.5; (3) reduce late-season nitrogen (stop by Sep 1); (4) apply preventive fungicide (azoxystrobin or thiophanate-methyl) in September. Curative options are limited once SDS appears — affected areas must fill in from surrounding healthy rhizomes (typically 6–10 weeks).