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ornamental grass

Northern sea oats

Chasmanthium latifolium

Preview: plant data is awaiting horticulturist review. A professional horticulturist hasn't reviewed our plant table yet. Lists still follow fixed rules for zone, sun, pets, deer and invasive status.

Hardy in zones 5–9, Northern sea oats is an ornamental grass. It grows 2–4 ft tall and 1.5–2.5 ft wide, so plant it 2 ft apart. Give it full sun to part shade and average water, and it copes with wet soil. It flowers green in July to September. In a FloraVista list it usually plays the grass role: a grass or grass-like plant that adds movement and fine texture in the middle. It is native to the Midwest, the Mid-Atlantic, the Southeast, Texas and the South-Central states and Florida and the Gulf. Deer usually leave it alone, and it is not listed as toxic to dogs or cats. Our rules leave it out of lists in the Desert Southwest, where summer heat, humidity or mild winters hold it back even inside its zone range.

Facts from our plant table

Botanical name
Chasmanthium latifolium
Plant type
Ornamental grass, herbaceous
Hardiness zones
5 to 9
Sun
Full sun (6+ hours); Part sun (4–6 hours); Part shade (2–4 hours)
Water
Medium; tolerates wet soil
Soil
Adaptable; best in moist, fertile soil.
Mature size
2–4 ft tall × 1.5–2.5 ft wide
Spacing
2 ft apart (centre to centre)
Growth rate
Medium
Bloom
Jul–Sep · green
Roles in a bed
Grass
Styles
natural, cottage
Deer resistance
High: deer rarely eat it
Pets
Not listed as toxic to dogs or cats
Native to
Midwest, Mid-Atlantic, Southeast, South-Central and Florida/Gulf
Pot size and price
1-gallon pot, typically $10–$18 (easy to find)
Plant in
Spring or Fall
First-year watering
Water deeply once or twice a week through the first summer, more in heat; keep the soil evenly moist but not soggy. Established plants need water only in dry spells.
Pruning
Cut off seed heads before they shatter to limit heavy self-seeding; cut back in late winter.

Sources: Missouri Botanical Garden Plant Finder; state extension service fact sheets; ASPCA toxic and non-toxic plant list (true grasses and sedges are not listed as toxic); Rutgers NJAES deer resistance ratings; state extension service; Invasive Plant Atlas of the United States; state noxious weed and invasive plant lists; US garden-centre and home-improvement retail listings (general knowledge, 2026 estimate); USDA PLANTS database; state extension service native plant lists. Not yet reviewed by a horticulturist.

Guides that include this plant

Good companions

The plants our list engine most often puts in the same bed as Northern sea oats, across the sun, zone, pet, deer and style combinations it fits.

If you can't find it

Substitutes our engine offers for Northern sea oats: same role in the bed, passing the same rules.

How this page was made

This page was generated from this plant's record in FloraVista's plant table by fixed rules. The companions and substitutes come from the lists our rules engine composes. No named expert has reviewed this page.

Data status: the plant table is awaiting review by a horticulturist. Check each plant with a local nursery or extension office before you buy.

Sources

  • Missouri Botanical Garden Plant Finder, state extension services and the USDA PLANTS database (zones, size, sun, water, bloom, native range)
  • ASPCA toxic and non-toxic plant lists (dog and cat toxicity)
  • Rutgers NJAES and regional extension deer-resistance ratings
  • State noxious-weed and invasive-plant lists and the Invasive Plant Atlas of the US
  • Typical US garden-centre listings (pot size and price band)

Generated . How FloraVista chooses plants