Atlantic mannagrass
Glyceria obtusa · Poaceae
Atlantic mannagrass (Glyceria obtusa) 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 -8°F.
At a glance
| Type | graminoid USDA |
|---|---|
| Lifecycle | perennial USDA |
| Native status | native USDA |
| Mature height | 3.3 ft USDA |
| Light | shade USDA |
| Water need | high USDA |
| Growth rate | rapid USDA |
| Soil pH | 4–7 USDA |
| Bloom | June–August USDA |
| Flower color | Green USDA |
| Hardiness zones | 6 and warmer USDA |
| Guild layer | herb-layer 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 tolerates full shade. USDA rates it as having needs consistently moist ground. Its drought tolerance is rated low. It tolerates saturated, poorly drained ground well (USDA rates its anaerobic tolerance high). It is recorded on soils from pH 4 to 7 — a broad range that spans acidic through mildly alkaline ground. Its cold limit is zone 6.
Size and growth
At maturity it reaches about 3.3 ft, making it roughly waist to chest height. It grows quickly.
Bloom period
USDA records a bloom period of June through August. Flowers are green.
A flowering date, not a pollinator rating.
Foliage, flower and season
Summer foliage is green, fine in texture. Its flowers are not conspicuous — a plant for form and foliage. Its active growth period is spring. USDA rates its lifespan as short, so plan on replacing or resowing it rather than treating it as permanent structure.
What the site needs to provide
USDA records it across sites receiving 40 to 50 inches of annual precipitation. It needs at least 140 frost-free days to finish its season. It roots to at least 4 inches. Fertility requirement: medium.
Propagating it
Sprigs is the only propagation method USDA lists. Its seed spreads at a moderate rate. It spreads vegetatively at a moderate rate.
Resilience and wildlife
Browsing animals find it moderately palatable, so expect deer and rabbits to take an interest. Its fire tolerance is rated none. Its growth form is recorded as rhizomatous.
Role in a guild
Herb layer. In a layered planting this is the herbaceous middle — perennials and grasses that fill the space between ground cover and shrubs. The layer is derived by a fixed rule from growth habit and mature height.
Tags
Related plants
Others in Glyceria
- small floating mannagrass Glyceria borealis
- rattlesnake mannagrass Glyceria canadensis
- melic mannagrass Glyceria melicaria
- fowl mannagrass Glyceria striata
Similar role and hardiness
- Rhodes grass Chloris gayana
- lanceleaf tickseed Coreopsis lanceolata
- tenangle pipewort Eriocaulon decangulare
- Palmer's penstemon Penstemon palmeri
Where this data comes from
Every value on this page comes from the USDA PLANTS database record for symbol GLOB, 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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