big cordgrass
Spartina cynosuroides · Poaceae
big cordgrass (Spartina cynosuroides) is a perennial grass or grass-like plant in the Poaceae family. It is native to North America. USDA records it as hardy in zone 6 and warmer, down to about -3°F.
At a glance
| Type | graminoid USDA |
|---|---|
| Lifecycle | perennial USDA |
| Native status | native USDA |
| Mature height | 8 ft USDA |
| Light | full-sun USDA |
| Water need | high USDA |
| Growth rate | moderate USDA |
| Soil pH | 5.8–7.5 USDA |
| Bloom | March–May USDA |
| Flower color | Yellow USDA |
| Hardiness zones | 6 and warmer USDA |
| Guild layer | understory Derived |
| Nursery availability | Routinely Available USDA |
USDA quoted from the USDA PLANTS database · Derived computed by a fixed rule from those columns. No value on this page is estimated.
Growing conditions
It needs full sun. USDA rates it as having needs consistently moist ground. Its drought tolerance is rated none — it needs reliable moisture. It tolerates saturated, poorly drained ground well (USDA rates its anaerobic tolerance high). It is recorded on soils from pH 5.8 to 7.5 — a broad range that spans acidic through mildly alkaline ground. Its cold limit is zone 6.
Size and growth
At maturity it reaches about 8 ft, making it a plant that will finish above head height. It grows at a moderate rate.
Bloom period
USDA records a bloom period of March through May. Flowers are yellow.
A flowering date, not a pollinator rating.
Foliage, flower and season
Summer foliage is green, coarse in texture. Its flowers are not conspicuous — a plant for form and foliage. Its active growth period is spring and summer. USDA rates its lifespan as long.
What the site needs to provide
USDA records it across sites receiving 40 to 60 inches of annual precipitation. It needs at least 210 frost-free days to finish its season. It roots to at least 20 inches. Fertility requirement: medium.
Propagating it
Propagate it from bare root and sprigs. Its seed spreads at a slow rate. It spreads vegetatively at a rapid rate.
Resilience and wildlife
Browsing animals rate it barely palatable — the sourced basis for calling it deer-resistant. Its fire tolerance is rated high. Its growth form is recorded as rhizomatous.
Role in a guild
Understory. In a layered planting this is the layer beneath the canopy, tall enough to hold structure but shaded from above. The layer is derived by a fixed rule from growth habit and mature height.
Tags
Related plants
Others in Spartina
- smooth cordgrass Spartina alterniflora
- sand cordgrass Spartina bakeri
- alkali cordgrass Spartina gracilis
- saltmeadow cordgrass Spartina patens
Similar role and hardiness
- Uruguayan pampas grass Cortaderia selloana
- parsley hawthorn Crataegus marshallii
- Franklin tree Franklinia alatamaha
- little walnut Juglans microcarpa
- crapemyrtle Lagerstroemia indica
Where this data comes from
Every value on this page comes from the USDA PLANTS database record for symbol SPCY, or is computed from those values by a fixed rule. Nothing here is estimated or model-generated. Where USDA publishes no value, this page omits the claim rather than filling the gap.
- Quoted from USDA PLANTS: active growth period, Bloom, Bloom end, browse palatability, cold stratification, Drought tolerance, fall conspicuous, fertility requirement, fire tolerance, Flower color, flower conspicuous, foliage color, foliage porosity winter, foliage texture, frost free days min, fruit conspicuous, growth form, Growth rate, Hardiness zones, Lifecycle, lifespan, Light, Mature height, Minimum temperature, Native status, Nitrogen fixation, Nursery availability, precipitation max in, precipitation min in, propagation, resprout ability, root depth in, seed spread rate, Soil pH, Soil pH (upper), Tolerance of wet soil, Toxicity, Type, vegetative spread rate, Water need.
- Derived by a fixed rule from those columns: Guild layer.
Read our full data sources and methodology.
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