Phleum pratense is a perennial bunchgrass, growing 2-3.5 ft. (0.61-1.1 m) tall, with a swollen or bulblike base, without rhizomes. It starts growth in early spring.
Foliage
Glabrous, distinctly veined on blade and sheath; blades flat to somewhat keeled, 4-8 in. (10.2-20.3 cm) long, up to 0.38 in. (0.95 cm) wide, tapering toward the tip, with midrib prominent on upper surface; leaves rolled in buds.
Flowers
The flowers occur from May to August. White little petals appears and the flower head is 2.8-5.9 in. (7-15 cm) long.
Fruit
The seeds are dense, cylindrical, symmetrical spike-like panicle, 2-5 in. (5-12.7 cm) long. The seeds have little hairs on them.
Ecological Threat
Phleum pratense will over take roadsides and abandoned fields but it requires larges amounts of nutrients from the soil.