Free AI Lawn Diagnosis
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Upload a photo of your lawn problem. Our AI analyzes it in seconds and identifies diseases, pests, weeds, and nutrient deficiencies specific to Florida grass types. You'll get a detailed diagnosis with treatment recommendations and product suggestions.

Yes, LawnLens offers 3 free diagnoses per month. Upgrade to Pro for 30 diagnoses/month plus SMS reminders and diagnosis history.

LawnLens is trained on Florida's four main grass types: St. Augustine, Bermuda, Zoysia, and Bahia grass. Our AI understands the unique diseases, pests, and care requirements for each grass type in Florida's climate.

LawnLens uses a custom-trained DINOv2 vision model with 81% top-1 accuracy across 33 lawn conditions, combined with GPT-4o for detailed treatment advice. For best results, upload a clear, well-lit photo showing the affected area of your lawn.

Brown patches in Florida lawns are most commonly caused by fungal diseases like Brown Patch (Rhizoctonia solani) and Large Patch, which thrive in warm, humid conditions. Other causes include chinch bug damage, drought stress, over- or under-watering, soil compaction, and improper mowing height. St. Augustine and Zoysia grasses are especially susceptible during Florida's wet season from June through September.

Chinch bugs are tiny black insects (about 1/6 inch) with white wings found at the base of grass blades. Look for irregular yellow-brown patches that spread outward, especially in sunny areas near driveways and sidewalks. To confirm, push a bottomless coffee can into the soil at the edge of a damaged area, fill it with water, and watch for chinch bugs floating to the surface within 10 minutes. Southern chinch bugs are the #1 pest of St. Augustine grass in Florida.

In Florida, fertilize your lawn during the active growing season from March through October. Apply a slow-release nitrogen fertilizer every 8–10 weeks. Avoid fertilizing during winter dormancy (November–February) or during drought stress. Many Florida counties have fertilizer blackout periods during summer rainy season — check your local ordinances. A soil test from your county extension office will tell you exactly which nutrients your lawn needs.

The most common lawn diseases in Florida include Brown Patch (circular brown areas in cool, wet weather), Gray Leaf Spot (diamond-shaped lesions on St. Augustine), Take-All Root Rot (yellowing and thinning grass with black roots), Dollar Spot (small bleached circles), and Pythium Blight (greasy dark patches in hot, humid conditions). Most fungal diseases in Florida are triggered by overwatering, poor drainage, or excessive nitrogen fertilization.