Overseeding Bermuda with Ryegrass in Phoenix: Golf Course Rough Strategy

Optimal Window

Mid-September through second week of October. Soil temps ideal for rye germination; Bermuda slowing but not dormant.

Critical Prep (No Scalping Allowed)

1. Mow gradually lower with bagger over several weeks—remove clippings.
2. Remove thatch: Rent a dethatcher (vertical mower), set shallow, run multiple directions. Rake/bag debris. This scarifies soil for seed contact.
3. Seed application: Spread perennial rye blend at 10–15 lbs/1,000 sq ft.
4. Water regime: Multiple short cycles daily (e.g., every 2 hrs for 15 min) to keep surface constantly moist. If golf course has irrigation, coordinate with superintendent.

Post-Germination

• No fertilizer until rye established (3 weeks).
• Then apply balanced organic fertilizer.
• Mow rye at 1.5–2 inches.

Spring Transition

Stop watering rye in late spring; it dies out as Bermuda wakes up. Scalp rye remnants to speed transition.