🌾 Overseeding 101

Revive your thin or patchy lawn with proper overseeding techniques.

What is Overseeding?

Overseeding is spreading grass seed over an existing lawn to fill in thin spots, improve density, and introduce improved grass varieties. It’s the most cost-effective way to rejuvenate a tired lawn.

Best Time to Overseed

Overseeding into an established lawn means you’re competing with existing grass — timing and preparation matter more than with bare-soil planting.

Step 1: Mow Low

Cut your grass shorter than usual — about 1.5–2 inches. This lets seed reach the soil instead of getting trapped in the canopy.

Step 2: Rake and Dethatch

• Rake vigorously to remove thatch and debris
• For heavy thatch (>½ inch), use a dethatcher or power rake
• The goal is to expose bare soil in thin areas

Step 3: Aerate (Highly Recommended)

Core aeration pulls plugs of soil from the lawn, creating perfect seedbed spots:

• Relieves soil compaction
• Improves seed-to-soil contact
• Enhances water and nutrient penetration

Step 4: Spread Seed

Use a broadcast spreader at half the rate recommended for new lawns. Overlap passes for even coverage. Focus extra seed on thin areas.

Step 5: Topdress (Optional)

A thin layer (¼ inch) of compost or topsoil over the seeded areas helps retain moisture and protects seed. This step isn’t required but significantly improves results.

Step 6: Water

• Light watering 2–3 times daily for the first 2–3 weeks
• Keep seed consistently moist — don’t let it dry out
• After germination, transition to deeper, less frequent watering

Step 7: Delay Mowing

Wait until new grass reaches 3–4 inches before mowing. Use a sharp blade and avoid cutting more than the top third.

Common Mistakes

• Overseeding without aeration — seed sits on top and never germinates
• Using the wrong seed — match your existing grass type
• Skipping starter fertilizer — new seedlings need phosphorus
• Mowing too early — uproots tender seedlings
• Herbicide too soon — wait until after 3–4 mowings