Lawn Care
Complete Step-by-Step Floratam Grass Maintenance Guide
Floratam Grass Profile and Agronomic Specs
Floratam is a specific, robust cultivar of St. Augustine grass (Stenotaphrum secundatum) developed jointly by the University of Florida and Texas A&M University. Originally bred for resistance to the St. Augustine Decline (SAD) virus and improved drought tolerance, it features a distinctively coarse leaf texture and wide stolons. While it dominates southern coastal landscapes, maintaining its dense, carpet-like appearance requires strict adherence to specific agronomic thresholds. Deviating from these parameters often leads to thatch accumulation, fungal outbreaks, or chinch bug infestations.
| Metric | Optimal Range / Requirement |
|---|---|
| Mowing Height | 3.5 to 4.0 inches |
| Soil pH | 5.5 to 7.5 (Tolerates up to 8.5) |
| Annual Nitrogen | 2.0 to 4.0 lbs per 1,000 sq. ft. |
| Weekly Water Need | 0.75 to 1.0 inches (Deep soak) |
| Shade Tolerance | Moderate (Requires 4-6 hours direct sun) |
Step 1: Precision Mowing Protocols
The most common failure point in Floratam maintenance is scalping. Because Floratam grows vertically and produces thick stolons (above-ground runners), cutting it too short severs the crown and exposes the soil to weed invasion. Set your rotary mower deck to exactly 3.5 to 4.0 inches.
Follow the one-third rule: never remove more than one-third of the leaf blade in a single pass. For a 4-inch target height, you must mow when the grass reaches 5.5 inches. During peak summer growth (June through August), this typically requires mowing every 5 to 7 days. Always use a sharp mulching blade; dull blades tear the coarse Floratam leaf tips, causing a grayish-white frizz that invites Gray Leaf Spot pathogens.
Step 2: Targeted Fertilization Schedule
Floratam requires a steady supply of nitrogen, but over-application leads to rapid thatch buildup and increased susceptibility to chinch bugs. Aim for 2 to 4 pounds of actual nitrogen per 1,000 square feet annually, split into three or four applications.
- Spring Green-Up (April): Apply a slow-release, high-nitrogen fertilizer like Lesco Professional 15-0-15 St. Augustine Fertilizer ($45-$55 per 50lb bag). The 15% nitrogen content with zero phosphorus complies with most southern municipal watershed regulations.
- Mid-Summer Maintenance (July): Switch to a micronutrient-heavy blend. Floratam frequently suffers from iron chlorosis in high-pH soils, manifesting as yellowing between leaf veins. Apply Ironite Plus Lawn & Plant Food at 2 lbs per 1,000 sq. ft. to restore deep green color without forcing excessive top growth.
- Fall Root Building (October): Apply a winterizer with higher potassium, such as Andersons Professional PGF 10-10-10, to harden the stolons against occasional winter freezes and improve spring recovery.
Step 3: Deep Watering and Soil Moisture Management
Floratam's deep root system thrives on infrequent, heavy watering rather than daily light sprinkling. Program your irrigation system to deliver 0.75 inches of water per session, twice a week during peak heat.
Calibration Tip: Place three empty, flat-bottomed tuna cans in different zones of your lawn. Run your sprinklers until the cans collect exactly 0.75 inches of water. Note the runtime (e.g., 35 minutes). Program your controller for this exact duration to eliminate water waste and prevent shallow rooting.
Always irrigate between 4:00 AM and 6:00 AM. Watering in the evening leaves the coarse Floratam blades wet overnight, creating the perfect humid microclimate for Brown Patch (Rhizoctonia solani) and Gray Leaf Spot.
Step 4: Proactive Pest and Disease Control
While Floratam was originally bred for chinch bug resistance, the Southern chinch bug (Blissus insularis) has developed widespread resistance to older pyrethroid chemicals. If you notice expanding patches of yellowing grass that mimic drought stress—particularly in full-sun areas near driveways or sidewalks—part the thatch and inspect the soil line for tiny black and white insects.
For active infestations, rotate your chemical classes. Use a product containing Imidacloprid (a neonicotinoid) or a combination product like Allectus (which contains both Bifenthrin and Imidacloprid) to bypass genetic resistance. Apply at the label rate of roughly 1.5 ounces per 1,000 sq. ft. and water it in immediately with 0.25 inches of irrigation to push the active ingredient into the thatch layer where the nymphs feed.
Warning: Take-All Root Rot (TARR)
If your Floratam lawn exhibits irregular yellow patches and the roots pull up easily, appearing black and rotted, you are likely dealing with TARR. Fungicides are largely ineffective once symptoms appear. The proven cultural remedy, supported by Texas A&M AgriLife Extension, is topdressing the affected areas with a 1-inch layer of Canadian Sphagnum Peat Moss (not standard peat or compost). The highly acidic nature of sphagnum (pH 4.0-4.5) locally suppresses the Gaeumannomyces graminis fungus. Apply 1 bale per 1,000 sq. ft. in early spring.
If your Floratam lawn exhibits irregular yellow patches and the roots pull up easily, appearing black and rotted, you are likely dealing with TARR. Fungicides are largely ineffective once symptoms appear. The proven cultural remedy, supported by Texas A&M AgriLife Extension, is topdressing the affected areas with a 1-inch layer of Canadian Sphagnum Peat Moss (not standard peat or compost). The highly acidic nature of sphagnum (pH 4.0-4.5) locally suppresses the Gaeumannomyces graminis fungus. Apply 1 bale per 1,000 sq. ft. in early spring.
Step 5: Core Aeration and Dethatching Rules
Floratam spreads via thick stolons, not rhizomes. Traditional core aeration (pulling soil plugs) can sever these stolons and damage the turf canopy. Instead, rely on liquid aeration (using humic acid and fulvic acid soil conditioners) to break up compacted clay soils without physical disruption.
Monitor your thatch layer annually by cutting a small wedge of turf with a spade. If the spongy, dead organic layer between the soil and the green blades exceeds 0.5 inches, it is time to verticut. Verticutting uses vertical blades to slice through the stolons and pull up dead material, promoting new lateral growth. Never use a standard power rake on Floratam, as the aggressive tines will rip the shallow root system out of the soil entirely.
Seasonal Maintenance Matrix
| Season | Primary Action Items | Product / Tool Recommendations |
|---|---|---|
| Spring (Mar-May) | Pre-emergent weed control, initial fertilization, TARR peat moss treatment. | Prodiamine 65 WDG (Pre-M), Sphagnum Peat Moss, Lesco 15-0-15. |
| Summer (Jun-Aug) | Strict mowing schedules, chinch bug scouting, deep irrigation calibration. | Allectus Granular Insecticide, Tuna cans for irrigation auditing. |
| Fall (Sep-Nov) | Potassium-heavy winterizing, post-emergent broadleaf weed control. | Andersons PGF 10-10-10, Celsius WG (for broadleaf weeds like dollarweed). |
| Winter (Dec-Feb) | Dormancy management, equipment servicing, soil testing. | UF/IFAS Extension Soil Test Kit, Mower blade sharpening service. |
Successful Floratam maintenance relies on consistency rather than intervention. By maintaining the 4-inch canopy height, enforcing strict morning watering schedules, and utilizing sphagnum peat moss for fungal suppression, homeowners can sustain a dense, weed-resistant turf that thrives in challenging southern heat. For localized soil deficiencies, always submit a soil sample to your local cooperative extension office, as outlined by UF/IFAS guidelines, before applying unverified amendments.
