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Importance

An increasing problem in arable situations.

Description

Large, dark green tufted perennial 30 - 60 cm. Flower head is flattened, with the spikelets arranged alternatively on opposite sides of the stem. Spikelets are awnless, unlike Italian rye-grass. Similar to common couch but has no rhizomes and the underside of the leaves are glossy.

The flower head may also be confused with couch grass. However, the spikelets of perennial rye-grass lie at 90° unlike couch where spikelets lie flat against the stem.

Ligule

Perennial Rye-grass ligule Short: up to 2 mm. Blunt.

 

 

 

 

 

 

 

 

 

Auricles: Small if present.

Leaf blade: Dark green and hairless. Leaf blades folded in shoot.

Perennial Rye-grass 1
Perennial Rye-grass 2
Perennial Rye-grass - young Perennial rye-grass seedling.
Perennial Rye-craft ligule photo Perennial rye-grass ligule. Photo © HGCA.

 

 

 

Perennial Rye-grass 3 Perennial rye-grass flower heads.
Perennial Rye-grass - mature Perennial rye-grass flower head. Photo © www.aphotoflora.com

Identify grass-weeds

You can use this page to help identify the grass-weeds in your crops, and then find out about the best crop protection products to control them.

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