Northern Sea Oats

Chasmanthium latifolium

Plant Details:

Plant Type: Ornamental Grass
Plant Family: Poaceae
Plant Description: Clump-forming perennial grass native to North America. Its chief characteristic are the flat seed heads that appear in late-summer to early-fall. The seed heads emerge green but turn to purplish-bronze with age eventually turning to tan when temperatures reach freezing. One of the most tolerant grasses to shade. Grows naturally along streams and other moist areas so it requires moist well-drained soils.


Maintenance Type: Ornamental Grass - Small
Plant Care: Ornamental Grass - Small (showy non-turf grasses that go dormant in winter, under 3' tall): Gather dried seed head stalks in one hand and use hand pruners to cut and remove 2/3 of the total grass height. For warm season grasses (more common), this is best done in late winter to early spring. For cool season grasses apply the same maintenance practices in the late fall, once the plant is dormant.

Plant Attributes:

Mature Size: 2-4' tall x 1-2.5' wide
Utah Native: No
Plant Select: No
Pollinator Friendly: Yes
Localscapes: Infill Plant
Foliage Interest: No
Foliage Colors: Light Green
Bloom Colors: Green
Bloom Seasons: Late Summer
Bloom Period: Aug - Sep

Growing Conditions:

Hardiness Zone: 5 to 9
Light Requirement: Full Sun (6+ hrs sun), Full Shade (0-4 hrs sun), Part Shade (4-6 hrs morning sun), Part Sun (4-6 hrs afternoon sun)
Irrigation Requirement:     High (1/2" more than once per week)
Salt Tolerant: Unknown
Deer Resistant: Unknown

Garden Location:

  • Neighborhood Landscapes
    • Harvest Haven
    • Tradition with a Twist
  • Spring
  • Summer
  • Fall
  • Winter