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Perennial Ryegrass

Lolium perenne

Quick Definition

Perennial ryegrass is the fastest-germinating lawn grass (5 to 7 days) with excellent wear tolerance. Primarily used as a blend component with bluegrass (10 to 20%) for quick establishment and as winter overseeding on bermuda lawns in the South.

Quick Facts

Type
Cool-season bunch grass
Zones
3 to 7
Germination
5 to 7 days (fastest lawn grass)
Primary Use
Blend component (10 to 20% with bluegrass)
Secondary Use
Winter overseeding on bermuda lawns
Sun
Full sun (6+ hours)
Mowing Height
2.5 to 3.5 inches
Water Need
Moderate
Traffic Tolerance
Excellent

What Is Perennial Ryegrass

Perennial ryegrass is a cool-season bunch grass valued for two things: it germinates in 5 to 7 days (fastest of any lawn grass) and it has excellent wear tolerance. It’s rarely used as a standalone lawn in the US because it lacks the density of bluegrass and the heat tolerance of fescue. Instead, it’s used as a blend component (10 to 20% mixed with bluegrass) for quick establishment and as an overseeding grass on warm-season lawns for winter color in the South.

How to Identify Perennial Ryegrass

Ryegrass blades are medium-width with a distinctive glossy appearance on the upper surface and prominent parallel veins on the underside. The blades fold in the bud (like bluegrass) but are wider and shinier. Ryegrass forms dense clumps and has a finer texture than tall fescue but coarser than bluegrass.

Frequently Asked Questions

Is perennial ryegrass good for lawns?

As part of a blend, yes. A mix of 80% Kentucky bluegrass and 20% perennial ryegrass is one of the most popular lawn seed combinations: the ryegrass establishes quickly (5 to 7 days) to stabilize the soil while the slower bluegrass fills in over the next month. As a standalone lawn, ryegrass is less ideal because it doesn't spread to fill gaps.

How fast does ryegrass germinate?

5 to 7 days, making it the fastest-germinating lawn grass. Kentucky bluegrass takes 14 to 21 days and tall fescue 7 to 14 days. This speed is why ryegrass is included in blends and why it's used for quick repair of damaged areas.

What is the difference between annual and perennial ryegrass?

Annual ryegrass dies after one season and is used for temporary cover or erosion control. Perennial ryegrass persists year after year and is a legitimate lawn grass. Always buy perennial ryegrass for lawns. Annual ryegrass is cheaper but creates a weed problem when it reseeds.

Can I overseed bermuda with ryegrass for winter?

Yes, this is a common practice in the Southeast. Overseed bermuda in October with perennial ryegrass at 8 to 10 lbs per 1,000 sq ft. The ryegrass provides green color through winter while the bermuda is dormant. The ryegrass dies in late spring as temperatures rise and bermuda takes over again.