Perennial Ryegrass Overseeding in South Louisiana

Heavy rains flooded a newly overseeded St. Augustine lawn, likely washing perennial rye seed into a neighbor's yard.

Ryegrass Fate in Zone 9

Perennial rye typically dies when spring temperatures exceed 85-90°F — but in south Louisiana's mild winters, it may persist and reseed. Keep mowed; prevent seedhead formation.

Removal Options

• If St. Augustine goes fully dormant (no green tissue after hard freeze): apply glyphosate during winter
• If St. Augustine stays semi-active: wait until late spring when ryegrass naturally declines

Better Alternative

Use annual ryegrass next year — it dies reliably in spring, easier to manage.