Repairing Bare Patches in a Mature Sod Lawn

Bare spots in a three-year-old sod lawn can stem from several causes. Before patching, diagnose the issue to prevent recurrence.

Identify the Cause

• Grub damage – Dead turf lifts like carpet.
• Fertilizer burn – Damage appears after summer applications and doesn't recover in fall.
• Mechanical injury – Mower scalping, foot traffic, or equipment.

Seed Selection

Choose a blend of perennial ryegrass, Kentucky bluegrass, and fine fescues (hard, chewing, or creeping red). Avoid tall fescue unless your lawn is already tall fescue, and never use annual (Italian) ryegrass. Check seed labels for a package date within six months.

Step-by-Step Patch Repair

1. Loosen the top 1–2 inches of soil with a rake or shovel.
2. Mix in a 1–2 inch layer of quality compost or potting soil.
3. Spread seed generously; press down with the back of a rake for good soil contact.
4. Water thoroughly, then keep the seedbed consistently moist (not soggy) until germination—2 to 6 weeks.
5. Water daily (1–2 times in warm weather, 3 times in heat). A light straw mulch helps retain moisture.
6. Once grass reaches 3–5 inches and has been mowed twice, switch to deep, infrequent watering (once weekly for 1.5–2 hours).

Best Timing

Spring (May) and early fall (September) are ideal for renovation.

Long-Term Lawn Care

• Fertilize lightly in late spring, early fall, and late fall (May, September, late October). Skip summer applications.
• Grub control – If grubs are confirmed, apply imidacloprid (Merit) in June (e.g., Scotts GrubEx).
• Aerate annually in fall.
• Mow high – 2.5–3.5 inches; never remove more than 1/3 of blade height.
• Water deeply – 1–1.5 inches per week, soaking soil 8–12 inches deep.

A healthy lawn starts with mowing high, watering deeply, and fertilizing wisely—three times a year is plenty.