Spike Bent
Agrostis exarata
Care
full sun, part shade
Adaptable, tolerant of sand, loam and clay.
1–3ft tall
Mar-May
Friendly
Marshes and wet meadows throughout California from sea level to 10,000 ft elevation, extending to British Columbia and the Great Plains
Care Guide
Planting
Plant spike bentgrass in full sun to part shade in spring or fall. This native bunchgrass is remarkably adaptable and will tolerate sandy, loamy, or clay soils, so soil preparation is minimal - just choose a spot with decent drainage. Space plants about 1–2 feet apart to account for their mature height of 1–3 feet.
After Planting
Water weekly during your first summer to establish the plant, then gradually reduce watering as it matures. Spike bentgrass is a perennial that spreads by rhizome and seed, so once established, it should need little supplemental water beyond Bay Area rainfall. The biggest mistake is overwatering: this native grass prefers drier conditions once it's in the ground, so resist the urge to baby it after the first season.
Wildlife Supported
Birds
Migratory waterfowl graze on grass shoots during fall migration staging; critical stopover fuel
Insects
Primary forage grass for nymphal development and adult nutrition
Primary larval host grass; caterpillars feed May-August
Nymphs and adults feed throughout growing season
Larval host in wetland and marshy grassland habitats
Caterpillar host plant; larvae feed on grass blades April-June
Sap-feeding pest and food source for beneficial insects; present in cool seasons
Fungal pathogen; host relationship indicates ecological role in natural population dynamics
Early season pollen source for emerging colonies
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