Algae Control in Lawns: Drainage Fixes & Cultural Solutions

Green-to-black scum on soil surface? Algae — thriving in wet, sunny, compacted, or over-fertilized areas. It crusts over when dry, smothering grass and blocking water.

Non-Chemical Control

1. Fix drainage: redirect downspouts, fill low spots.
2. Break up algae crust so water reaches soil.
3. Soil test healthy vs. affected areas; amend per results (lime/fertilizer).
4. Aerate compacted zones.

Severe Cases

Copper sulfate: 5 oz in 3 gallons water per 1,000 sq ft. Use sparingly.

Diagnosis and cultural correction almost always suffice.