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Redtop
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Pollen Type: Grass
Cross-Reactivity: Colonial Bent Grass, Koeler’s Grass, Common Wild Oats, Tall Oatgrass, Velvetgrass
HS Allergy Extract: Redtop or Timothy
Family: Poaceae
Genus/Species: Agrostis alba
Common Names: Redtop, Herd’s Grass, Creeping Bent Grass
Distribution: Throughout the United States except for the warmest areas.
Locations: Widely cultivated for lawns, pastures, and meadows. A common escape in cooler regions.
Pollinating Period: June through mid-August, mostly June & July. As early as April in Pacific Coast states.
Pollination Method: Wind-pollinated
Description: Redtop is an upright perennial grass 2’-5’ feet tall and up to 1/3” wide. It’s flat, hairless, and mostly smooth on both sides and grows by creeping root stalks (rhizomes). Its flowers grow on loose pyramidal-shaped panicles (loose branches containing the seed heads) up to 12” long. Flower clusters (spikelets) on the head are usually reddish colored. It is considered a fairly heavy pollinator.
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