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Weed Identification

orchardgrass

Family

Poaceae

Scientific Name

Dactylis glomerata

Other Common Names:

orchardgrass

Habit

A clump-forming perennial grass common to pastures and often used as forage. Orchardgrass can be a big problem in tall fescue lawns of residential areas established on existing pasture. In addition, orchard grass seed are grown for commercial forage production and often are found as a contaminate in turf-type tall fescue seed due to similar size and shape. Plants can grow to 2 to 4 ft tall but also tolerate mowing at typical lawn heights.

Leaves

Leaves are light green, folded into a V-shape at the base, have a prominent midrib along the underside, and margins that are rough to the touch. The ligule is a tall jagged membrane and plants lack auricles. Leaves are 10 to 13 inches long and 2 to 10 mm wide.

Identifying Characteristics

Leaves folded in the bud and ligule is tall, pointed and often jagged across the top. The seedhead is a panicle that is densely clustered with fan-shaped spikelets.

Flower Seed Head

Seedhead often borne on tall slender stalk to waist high and consist of a densely clustered panicle with fan-shaped green spikelets. Flowers late spring into early summer.

Seed Fruit

Seed are similar in size and shape to tall fescue. Seed are flat, narrow and may have awns up to 2 mm long.

Where Found

Found in pastures, ditches or any open disturbed site. A serious weed problem in tall fescue lawns.

Leaf Hair on Upper Surface

no hairs

Leaf Arrangement

folded in bud

Mature Leaf Width

Varies: 
less than 5 mm
6 to 15 mm

Stem

flat or oval

Seedhead

panicle

Life Cycle

perennial

Auricle

not present

Ligule

membrane

Ligule Length

more than 3 mm

Plant Type

Grass