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Mountain Stonecrop

Sedum ternatum (SEE-dum ter-NAY-tum)

Family: Crassulaceae Native Groundcover (<1 ft)

The genus name comes from the Latin word sedeo meaning to sit in reference to the habit of many of the sedum species to sit and sprawl over rocks. The species name means in threes and refers to the leaves which appear in whorls of three. Mountain Stonecrop matures to a 6 inch high plant with a 1 foot spread and four-parted white flowers. Like many of its genus, it is often used as ground cover. The stems will creep along the ground or over rocks, forming dense mats. The stems usually send up a single flowering branch, 4 to 8 inches high, and several shorter, leafier, non-flowering branches. Stems break away and die in winter, leaving newly rooted plants separated from the mother plant. The leaves tend to fall off easily; however, the fallen leaves can be used to propagate new plants. Some references describe this plant as mildly toxic if ingested, while others do not. In any event, stems and leaves may be eaten raw when very young and tender. As the stems and leaves age, but before the plants flower, the edible parts may still be eaten if they are briefly cooked. The sap can irritate the skin of some people and the leaves, eaten in quantity, can cause stomach upsets. In nature, Mountain Stonecrop is often found in moist forests, wooded ravines, coves, bottomlands, or shaded rock outcrops or river banks. Plant 6 to 12 inches apart in a site with partial to full shade in well-drained soil. It will tolerate full sun, seldom needs watering, and will grow in moist soils with good drainage. The plant tolerates shade and moist soils better than most other sedums as well as drought and heat, rocky and poor soils. It establishes itself quickly, but may do less well in cold temperatures. Diseases, Insect Pests, and Other Plant Problems: No serious diseases or insect problems, except for occasional slugs and snails. Avoid wet or poorly drained conditions. VIDEO Created by Laura Barth for "Houseplants, Succulents, and Cacti," a plant identification course created in partnership with Longwood Gardens.

Source: NC State Extension Gardener Plant Toolbox ↗ NC State Extension Gardener Plant Toolbox, 61 attributes.

How it fits the guild

Guild layer 5 - Groundcover (<1 ft) Optimal soil pH Alkaline (>8.0); Neutral (6.0-8.0)
See companions & conflicts ↓

Companions & Conflicts

Curated pairwise relationships between this plant and others in the library — who feeds whom, who competes, who confuses the pests. Green reads as a good pairing, red as one to avoid.

No curated interactions recorded for this species yet.

Also noted by NC State

Related species the NC State Plant Toolbox flags for this plant — look-alikes to tell apart, and plants that play a similar role in a planting. Ones we carry in the library are linked.

Full plant profile

Growing Conditions
Plant type
Ground Cover; Herbaceous Perennial; Native Plant; Succulent; Wildflower
Life cycle
Perennial
USDA zones
3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b
Light
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)
Soil texture
Clay; Sand; Shallow Rocky
Soil pH
Alkaline (>8.0); Neutral (6.0-8.0)
Soil drainage
Good Drainage | Moist | Occasionally Dry | Very Dry
Available space
Less than 12 inches
NC region
Coastal; Mountains; Piedmont
Mature size
Height: 0 ft. 3 in. - 0 ft. 6 in. | Width: 0 ft. 6 in. - 1 ft. 0 in.
Growth rate
Medium
Maintenance
Low
Canopy layer
5 - Groundcover (<1 ft)
Form & Appearance
Habit / form
Creeping; Dense; Spreading
Texture
Fine
Foliage
Broadleaf Evergreen; Deciduous
Leaf color
Green
Leaf type
Simple
Leaf arrangement
Alternate; Whorled
Leaf shape
Orbicular; Ovate; Spatulate
Leaf margin
Entire
Leaf feel
Fleshy; Smooth
Leaf size
1-3 inches long
Hairs present
No
Leaf detail
Flat or rounded leaves. Lower leaves are spatulate. Non-flowering stems have 1/2 to 1 inch flat, oval, medium green leaves arranged in whorls of three. Flower stems have smaller leaves.
Flower color
White
Flower value
Showy
Flower form
Cyme
Flower shape
Star
Flower size
< 1 inch
Flower detail
Flower stalk branches into three curved or horizontal branches of white flowers, 4-5 petals with sharp points and 5 green sepals. Clusters of tiny white, star-like flowers (to 1/2" wide) with purplish stamens. Blooms from April to June.
Bloom time
Spring
Fruit type
Capsule
Fruit size
< 1 inch long, < 1 inch wide
Fruit detail
Displays from May to July. Collect the very small, dark-brown seeds 2 to 3 weeks after the plant flowers. Air-dry and store in sealed, refrigerated containers.
Stem detail
Arching stem
Wildlife & Ecology
Native status
Native
Origin
South East Canada and Eastern United States
Distribution
Maine to Georgia and west, from Michigan to Iowa and Arkansas
Wildlife value
attracts butterflies
Attracts
Butterflies; Pollinators; Songbirds
Play value
Attractive Flowers; Attracts Pollinators; Textural
Food & Medicine
Edible parts
Leaves; Flowers; Stems
Harvest time
Summer
Fruit type
Capsule

Edibility

The stems and leaves, when very young and tender, may be eaten raw. Later, until they flower, they may be briefly cooked. When ingested in large quantities, can cause stomach upset.

Landscape Use
Landscape location
Naturalized Area; Recreational Play Area; Rock Wall; Slope/Bank
Landscape theme
Butterfly Garden; Children's Garden; Native Garden; Pollinator Garden
Design feature
Border; Mass Planting
Garden tags
#children's garden #pollinator plant #semi-evergreen #native wildflower #succulent #NC native #bird friendly #food source nectar #food source pollen #food source summer #FACU Piedmont Mountains #Audubon #Coastal FACU #fall interest #playground plant #deciduous #groundcover #perennial #herb garden #NC Native Pollinator Plant #fpp
Problems & Resistance
Disease problems
Southern Blight of Herbaceous Ornamentals
Resistant to
Deer; Drought; Poor Soil
Propagation
Division; Leaf Cutting; Root Cutting; Seed; Stem Cutting

Planted at Hunnicutt

Nobody’s planted this one yet.