• Photo of Panicum amarum (Panicum amarums)

Plant Profile: Panicum amarum

Taxonomy: Panicum amarum

Names

Bitter Panicgrass, Bitter Panicum, Bitter Switchgrass, Coastal Switchgrass, Panic Grasses, Seabeach Grass, Switchgrass

  • Photo of Panicum amarum (Panicum amarums)

Phonetic Spelling:PAN-ih-kum a-MAHR-um

Genus:Panicum

Species:amarum

Family:Poaceae

Bitter switchgrass is a warm-season ornamental perennial belonging to the Poaceae family. This grass thrives in sandy dunes and coastal regions, ranging from Connecticut down to Florida and Texas. The variety amarulum is also found in these areas, as well as in sandflats and sandhills. It thrives in well-drained soils with low to medium moisture levels, demonstrating resilience even in poor sandy loams. Along the southern coast of North Carolina, it serves as an effective dune stabilizer.

This grass forms clumps and propagates through rhizomes. To keep its shape looking appealing, it should be cut back to the ground during late winter or early spring. Bitter switchgrass integrates seamlessly into landscapes, making it an excellent choice for rain gardens or borders. It is a low-maintenance plant that requires minimal water, tolerates dry conditions, withstands drought, and is resistant to air pollution. Additionally, it exhibits a high tolerance for salt.

**Seasons of Interest:**
- **Bloom:** Fall to Winter, September to February

**Insects, Diseases, and Other Plant Issues:**
There are no significant insect or disease threats. However, excessive organic material in the soil may cause the grass to become floppy. While it can tolerate light shade, too much shade can lead to a loss of form, resulting in a more open growth habit and potential flopping.

**Propagation:**
Through rhizomes.

Panicum amarum Feature Summary

Panicum amarum Image Gallery

Tags

#rain garden
#drought tolerant
#wildlife plant
#salt tolerant
#low maintenance
#winter interest
#fall interest
#air pollution tolerant
#erosion control
#highly beneficial coastal plants
#NC native
#borders
#native ornamental grass
#larval host plant
#food source herbage
#coastal FAC
#native sedge
#bird friendly
#food source hard mast fruit
#mammals
#butterfly friendly
#butterfly larvae
#Piedmont Mountains FACU
#pollinator garden
#audubon
#meadows
#common wood-nymph butterfly
#various skipper butterflies

Similar Plants

Panicum amarum Feature Summary

Attributes
Native to North America, Mexico
This is a larval host plant for various Skipper butterflies and the Common Wood-Nymph (Cercyonis pegala) which have one brood from late May to October. Adult Common Wood-Nymph butterflies feed on rotting fruit and flower nectar.
Fruit
Fruits are available August-December.
Caryopsis
Flowers
Flowers bloom July-November.
Showy
Long-lasting
Whole Plant Traits
Perennial
Ornamental Grasses and Sedges
Arching
Dense
Clumping
Cultural Conditions
Full sun (6 or more hours of direct sunlight a day)
Moist
Occasionally Dry
Very Dry
Coastal
4a
4b
5b
5a
6a
6b
7a
7b
8b
8a
2a
2b
3a
3b
9a
9b
Leaves
Green
Gray/Silver
Blue
< 1 inch
Landscape
Butterfly Garden
Pollinator Garden
Winter Garden
Rain Garden
Native Garden
Drought
Pollution
Salt
Dry Soil
Erosion
Black Walnut
Butterflies
Pollinators
Songbirds
Small Mammals

Panicum amarum Attributes

Panicum amarum: Country Or Region Of Origin

Native to North America, Mexico

Panicum amarum: Wildlife Value

This is a larval host plant for various Skipper butterflies and the Common Wood-Nymph (Cercyonis pegala) which have one brood from late May to October. Adult Common Wood-Nymph butterflies feed on rotting fruit and flower nectar.

Panicum amarum: Recommended Propagation Strategy

Division
Grafting
Layering
Leaf Cutting
Root Cutting
Seed
Stem Cutting

Panicum amarum Fruit

Panicum amarum: Fruit Description

Fruits are available August-December.

Panicum amarum: Fruit Type

Achene
Aggregate
Berry
Capsule
Caryopsis
Drupe
Follicle
Legume
Nut
Pome
Samara
Schizocarp
Siliqua

Panicum amarum: Display/Harvest Time

Fall
Spring
Summer
Winter

Panicum amarum Flowers

Panicum amarum: Flower Description

Flowers bloom July-November.

Panicum amarum: Flower Color

filter_vintage
Pink

Panicum amarum: Flower Value To Gardener

Edible
Fragrant
Good Cut
Good Dried
Long Bloom Season
Long-lasting
Showy

Panicum amarum: Flower Bloom Time

Winter
Spring
Summer
Fall

Panicum amarum Whole Plant Traits

Panicum amarum: Plant Type

Annual
Bulb
Carnivorous
Edible
Epiphyte
Fern
Ground Cover
Herb
Herbaceous Perennial
Houseplant
Mushroom
Native Plant
Ornamental Grasses and Sedges
Perennial
Poisonous
Rose
Shrub
Succulent
Tree
Turfgrass
Vegetable
Vine
Water Plant
Weed
Wildflower

Panicum amarum: Habit/Form

Arching
Ascending
Broad
Cascading
Climbing
Clumping
Columnar
Conical
Creeping
Dense
Erect
Horizontal
Irregular
Mounding
Multi-stemmed
Multi-trunked
Open
Oval
Prostrate
Pyramidal
Rounded
Spreading
Vase
Weeping

Panicum amarum: Maintenance

Low
Medium
High

Panicum amarum Cultural Conditions

Panicum amarum: Light

Dappled Sunlight (Shade through upper canopy all day)
Deep shade (Less than 2 hours to no direct sunlight)
Full sun (6 or more hours of direct sunlight a day)
Partial Shade (Direct sunlight only part of the day, 2-6 hours)

Panicum amarum: Soil Drainage

Frequent Standing Water
Good Drainage
Moist
Occasional Flooding
Occasionally Dry
Occasionally Wet
Very Dry

Panicum amarum: Available Space To Plant

12 inches-3 feet
12-24 feet
24-60 feet
3 feet-6 feet
6-feet-12 feet
Less than 12 inches
more than 60 feet

Panicum amarum: NC Region

Coastal
Mountains
Piedmont

Panicum amarum: USDA Plant Hardiness Zone

thermostat
2a
thermostat
2b
thermostat
3a
thermostat
3b
thermostat
4a
thermostat
4b
thermostat
5a
thermostat
5b
thermostat
6a
thermostat
6b
thermostat
7a
thermostat
7b
thermostat
8a
thermostat
8b
thermostat
9a
thermostat
9b

Panicum amarum: Soil Texture

Clay
High Organic Matter
Loam (Silt)
Sand
Shallow Rocky

Panicum amarum Leaves

Panicum amarum: Leaf Color

spa
Blue
spa
Gray/Silver
spa
Green

Panicum amarum: Hairs Present

No
Yes

Panicum amarum: Leaf Feel

Fleshy
Glossy
Leathery
Papery
Prickly
Rough
Rubbery
Slippery
Smooth
Soft
Velvety
Waxy

Panicum amarum: Leaf Width

< 1 inch
1-3 inches
3-6 inches
> 6 inches

Panicum amarum Stem

Panicum amarum: Stem Is Aromatic

No
Yes

Panicum amarum Landscape

Panicum amarum: Landscape Theme

Asian Garden
Butterfly Garden
Children's Garden
Cottage Garden
Cutting Garden
Drought Tolerant Garden
Edible Garden
English Garden
Fairy Garden
Garden for the Blind
Native Garden
Nighttime Garden
Pollinator Garden
Rain Garden
Rock Garden
Shade Garden
Water Garden
Winter Garden

Panicum amarum: Resistance To Challenges

Black Walnut
Compaction
Deer
Diseases
Drought
Dry Soil
Erosion
Fire
Foot Traffic
Heat
Heavy Shade
Humidity
Insect Pests
Pollution
Poor Soil
Rabbits
Salt
Slugs
Squirrels
Storm damage
Urban Conditions
Voles
Wet Soil
Wind

Panicum amarum: Attracts

Bats
Bees
Butterflies
Frogs
Hummingbirds
Moths
Pollinators
Predatory Insects
Reptiles
Small Mammals
Songbirds
Specialized Bees