• Photo of Tridens flavus (Tridens flavuss)

Plant Profile: Tridens flavus

Taxonomy: Tridens flavus

Names

Grease Grass, Purpletop, Purple Top, Purpletop Tridens, Redtop, Redtop Tridens, Tall Redtop, Tall Redtop Tridens

  • Photo of Tridens flavus (Tridens flavuss)

Phonetic Spelling:TRY-dens FLA-vus

Genus:Tridens

Species:flavus

Family:Poaceae

This is a native warm-season bunchgrass belonging to the Poaceae family, known for its striking reddish-purple seed heads that emerge in late summer and linger into the fall, creating a stunning visual effect when planted in large groups. It thrives in saline environments and is commonly found along roadside ditches. The oily nature of its seed heads gives rise to its nickname, grease grass, and these seeds serve as a food source for various birds and mammals.

Purple Top is a perennial grass that typically reaches heights of 3 to 5 feet and spreads about 3 feet wide. Its foliage showcases a vibrant color as it grows each spring. Once the leaves mature, purple panicles begin to form, blooming from August through November. This grass is also highly resistant to deer.

Seasons of Interest:

     Bloom: Late Summer to Fall, specifically from August to October; Fruit/Seed/Nut: Fall to Winter

Potential Issues: Insects, diseases, or other plant-related problems:

Tridens flavus Feature Summary

Tridens flavus Image Gallery

Tags

#purple
#perennial
#wildlife plant
#moths
#salt tolerant
#cover plant
#food source
#NC native
#deer resistant
#native garden
#pollinator plant
#native ornamental grass
#larval host plant
#food source fall
#food source herbage
#bird friendly
#food source hard mast fruit
#mammals
#butterfly friendly
#butterfly larvae
#Piedmont Mountains FACU
#Coastal FACU
#pollinator garden
#audubon
#common wood-nymph butterfly
#various skipper butterflies

Similar Plants

Tridens flavus Feature Summary

Attributes
Mountains, Piedmont, Coastal Plain.
Seed heads are a food source for birds and mammals. This is a larval host plant that supports various skipper larvae and 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. This species is also the larval host of a number of butterflies and moths, including Polites origenes (Crossline Skipper), Pompeius verna (Little Glassywing), and Poanes viator (Broad-winged Skipper). It provides excellent cover year-round.
Salt, Deer, Drought, Erosion, Dry Soil, Air Pollution
Perennial
Fruit
Fruits display from September to November.
Caryopsis
Flowers
Purple panicles appear July to October.
Purple/Lavender
Gold/Yellow
Brown/Copper
Cream/Tan
Good Cut
Showy
Long-lasting
Whole Plant Traits
Perennial
Native Plant
Ornamental Grasses and Sedges
Erect
Clumping
Coarse
Cultural Conditions
Full sun (6 or more hours of direct sunlight a day)
Partial Shade (Direct sunlight only part of the day, 2-6 hours)
Dappled Sunlight (Shade through upper canopy all day)
Good Drainage
Moist
Occasionally Dry
Coastal
Mountains
Piedmont
4a
4b
5b
5a
6a
6b
7a
7b
8b
8a
9a
9b
Clay
High Organic Matter
Loam (Silt)
Sand
Shallow Rocky
Landscape
Butterfly Garden
Pollinator Garden
Woodland
Meadow
Naturalized Area
Butterflies
Pollinators
Songbirds

Tridens flavus Attributes

Tridens flavus: Country Or Region Of Origin

North America, NC

Tridens flavus: Distribution

Mountains, Piedmont, Coastal Plain.

Tridens flavus: Wildlife Value

Seed heads are a food source for birds and mammals. This is a larval host plant that supports various skipper larvae and 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. This species is also the larval host of a number of butterflies and moths, including Polites origenes (Crossline Skipper), Pompeius verna (Little Glassywing), and Poanes viator (Broad-winged Skipper). It provides excellent cover year-round.

Tridens flavus: Particularly Resistant To (Insects/Diseases/Other Problems)

Salt, Deer, Drought, Erosion, Dry Soil, Air Pollution

Tridens flavus: Life Cycle

Annual
Biennial
Bulb
Perennial
Woody

Tridens flavus: Recommended Propagation Strategy

Division
Grafting
Layering
Leaf Cutting
Root Cutting
Seed
Stem Cutting

Tridens flavus Fruit

Tridens flavus: Fruit Description

Fruits display from September to November.

Tridens flavus: Fruit Type

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

Tridens flavus: Display/Harvest Time

Fall
Spring
Summer
Winter

Tridens flavus Flowers

Tridens flavus: Flower Description

Purple panicles appear July to October.

Tridens flavus: Flower Color

filter_vintage
Brown/Copper
filter_vintage
Cream/Tan
filter_vintage
Gold/Yellow
filter_vintage
Purple/Lavender

Tridens flavus: Flower Inflorescence

Catkin
Corymb
Cyme
Head
Insignificant
Panicle
Raceme
Solitary
Spadix
Spike
Umbel

Tridens flavus: Flower Value To Gardener

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

Tridens flavus: Flower Bloom Time

Winter
Spring
Summer
Fall

Tridens flavus Whole Plant Traits

Tridens flavus: 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

Tridens flavus: Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Tridens flavus: 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

Tridens flavus: Maintenance

Low
Medium
High

Tridens flavus: Texture

Fine
Medium
Coarse

Tridens flavus Cultural Conditions

Tridens flavus: 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)

Tridens flavus: Soil Drainage

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

Tridens flavus: 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

Tridens flavus: NC Region

Coastal
Mountains
Piedmont

Tridens flavus: USDA Plant Hardiness Zone

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

Tridens flavus: Soil Texture

Clay
High Organic Matter
Loam (Silt)
Sand
Shallow Rocky

Tridens flavus Leaves

Tridens flavus: Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Tridens flavus: Leaf Color

spa
Green

Tridens flavus: Leaf Type

Compound (Pinnately , Bipinnately, Palmately)
Fronds
Needles
Sheath
Simple

Tridens flavus: Leaf Arrangement

Alternate
Opposite
Other/more complex
Rosulate
Whorled

Tridens flavus: Leaf Shape

Acicular
Auriculate
Cordate
Cuneate
Deltoid
Elliptical
Filiform
Lanceolate
Linear
Oblanceolate
Oblong
Obovate
Obtuse
Orbicular
Ovate
Palmasect
Palmatifid
Peltate
Pinnatifid
Pinnatisect
Reniform
Rhomboidal
Spatulate
Subcordate
Subulate

Tridens flavus: Hairs Present

No
Yes

Tridens flavus: Leaf Length

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

Tridens flavus: Leaf Width

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

Tridens flavus Stem

Tridens flavus: Stem Is Aromatic

No
Yes

Tridens flavus Landscape

Tridens flavus: 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

Tridens flavus: 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

Tridens flavus: Landscape Location

Coastal
Container
Hanging Baskets
Houseplants
Lawn
Meadow
Naturalized Area
Near Septic
Patio
Pond
Pool/Hardscape
Recreational Play Area
Riparian
Rock Wall
Slope/Bank
Small Space
Vertical Spaces
Walkways
Woodland

Tridens flavus: Attracts

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