// SPECIES PROFILE · PERENNIAL · NATIVE · EVERGREEN · SHADE · GROUNDCOVER

Heartleaf

Hexastylis arifolia

Heartleaf (also called Little Brown Jug or Arrowleaf Ginger) is one of the most elegant and durable evergreen groundcovers native to the southeastern United States — a low, rhizomatous perennial of the forest floor whose glossy, leathery, heart-shaped leaves form a dense, dark-green carpet in the deepest shade. The leaves are often strikingly variegated with silver or pale green mottling along the veins, giving the foliage a luminous, stained-glass quality in the dim woodland light. Hexastylis arifolia (sometimes still listed as Asarum arifolium) is a close cousin of the better-known wild ginger, and like its relatives, its odd, jug-shaped brown flowers bloom at ground level in spring, pollinated by ants and ground beetles. For NE Oklahoma woodland gardens, it is a premier choice for replacing non-native groundcovers (ivy, vinca, monkey grass) under mature trees.

// QUICK FACTS

Family: Aristolochiaceae (birthwort / Dutchman's pipe family)
Life cycle: Evergreen perennial; rhizomatous groundcover; extremely long-lived
Native range: Southeastern US — Virginia to Florida, west to Louisiana and eastern Oklahoma
USDA hardiness: Zones 5–9 (Tulsa = 7a/7b)
Mature size: Foliage 4–8 in tall; spreads indefinitely by rhizomes as a groundcover
Bloom period: April – June (NE OK); flowers hidden at ground level beneath the foliage
Flower: Small, fleshy, jug-shaped, brownish-purple; pollinated by ants and ground beetles
Sun: Full shade to part sun; best in dappled woodland light or deep shade
Soil: Moist, well-drained, humus-rich acidic loam; pH 4.5–6.5; tolerant of clay with organic amendment
Water: Medium; prefers consistent moisture but tolerates short dry spells once established
Wildlife: Ant-pollinated · pipevine swallowtail host · dense cover for ground-dwelling invertebrates

Heartleaf (Hexastylis arifolia) groundcover of glossy heart-shaped leaves with silver variegation — *Hexastylis arifolia* — the glossy, often silver-variegated heart-shaped leaves form a dense evergreen carpet in deep shade. Photo: Rooted Revival.

Identification

[ field key — leaf · flower · rhizome · vs. Asarum canadense ]

Habit & Rhizome

A low, evergreen, rhizomatous perennial forming a dense, prostrate carpet of overlapping leaves 4–8 in tall. The plants spread by shallow, creeping, aromatic rhizomes that run just beneath the leaf litter, rooting at nodes and producing new leaf clusters each year. Individual plants are connected in a loose colonial network. The rhizomes have a distinctive ginger-like scent when crushed or cut (hence the name "wild ginger," though it is not related to culinary ginger). Growth is slow but persistent; a planting will gradually expand to cover available ground over 5–10 years. The evergreen foliage provides year-round structure in the woodland garden.

Leaves

The leaves are the showpiece: evergreen, simple, alternate, distinctly heart-shaped (cordate) to triangular-ovate, 2–5 in long and wide, with a deep basal sinus (notch) where the petiole attaches. The blade is thick, leathery, and glossy dark green, often strikingly variegated with silver, pale green, or cream-colored reticulations along the veins. The leaf margin is entire, and the petiole is 2–6 in long, usually reddish-brown at the base. Leaves persist for 2–3 years before being replaced. The pattern and intensity of variegation varies by individual and population, and highly variegated forms are prized by gardeners.

Flowers

The flowers are cryptic, hidden at ground level beneath the foliage and often covered by leaf litter. They are fleshy, jug- or urn-shaped (urceolate), about 1/2–1 in long, with three short, triangular lobes at the opening. The color is dull brownish-purple to reddish-brown, giving them a somewhat fungal or carrion-like appearance. The flowers are borne on short peduncles that lie on the ground. They bloom in April through June and are pollinated primarily by ants and small ground beetles that crawl into the flower seeking the faint odor of decay or the small nectar reward. This is a classic example of myrmecophily (ant pollination).

Fruit & vs. Asarum canadense

The fruit is a fleshy capsule that splits open at maturity to release several brown seeds with a fleshy appendage (elaiosome) attractive to ants, which disperse the seeds (myrmecochory). Key differences from Canadian wild ginger (Asarum canadense): H. arifolia has evergreen, glossy, often variegated leaves (vs. deciduous, matte, uniformly green leaves of A. canadense), and its flowers are jug-shaped and brown-purple (vs. the cup-shaped, dark reddish-brown flowers of A. canadense with longer, more pointed lobes).

Habitat & Range in NE Oklahoma

Hexastylis arifolia is native to the southeastern United States, ranging from Virginia and Kentucky south to Florida and the Gulf Coast, and west to Louisiana and eastern Oklahoma. In NE Oklahoma it reaches the western edge of its range, occurring in rich, mesic deciduous forests on acidic soils — the deeply shaded understory of oak-hickory and mixed hardwood forests, especially on north-facing slopes, along wooded creek bottoms, and in deep ravines. It is often found growing in association with other acid-loving woodland species like flowering dogwood, sourwood, and various Vaccinium (blueberry) species in the Ozark foothill region of Delaware, Adair, and Cherokee counties.

In Oklahoma, H. arifolia is uncommon and localized, restricted to the highest-quality remnant forest stands in the easternmost counties. Its presence is an indicator of a woodland floor that has been relatively undisturbed, with a deep duff layer of acid leaf litter (oak, hickory, pine) and minimal compaction. It is absent from the disturbed, invasive-choked woodlands that characterize much of the Tulsa metro area's remaining forest fragments unless deliberately planted.

Ecology & Wildlife Value

[ ant pollination · seed dispersal · pipevine swallowtail · forest-floor ecology ]

Ant-Mediated Pollination & Dispersal

Hexastylis arifolia has a mutualistic relationship with ants at both ends of its reproductive cycle. The ground-level flowers are pollinated by small ants and carabid beetles that are attracted to the faint, fungus-like scent and crawl into the floral chamber. After fertilization, the seeds develop a fleshy, oily elaiosome that is highly attractive to ants, which carry the seeds back to their nests, consume the elaiosome, and discard the intact seed in their underground refuse chambers — an ideal germination site. This dual ant dependency (pollination + dispersal, or "myrmecochory") is relatively rare and ecologically specialized.

Pipevine Swallowtail Host

Plants in the family Aristolochiaceae, including Hexastylis, contain aristolochic acids that are sequestered by the larvae of the pipevine swallowtail (Battus philenor), making both caterpillars and adult butterflies distasteful to predators. While the primary host in our region is woolly Dutchman's pipe (Isotrema tomentosum, formerly Aristolochia tomentosa), the foliage of Hexastylis species also serves as a secondary host, and pipevine swallowtail caterpillars may occasionally be found on heartleaf in the wild.

Forest Floor Habitat

The dense, evergreen foliage carpet created by H. arifolia provides year-round cover and humid microhabitat for a wide range of forest-floor invertebrates: millipedes, isopods (roly-polies), springtails, spiders, small beetles, and the larvae of numerous decomposer insects. This rich invertebrate community in turn supports salamanders, frogs, small snakes, and ground-foraging birds like ovenbirds and thrushes. A woodland floor with a healthy Hexastylis groundcover is a functioning ecosystem, not just a mulch bed.

Herbivory & Chemical Defense

The aromatic rhizomes and leaves contain essential oils and aristolochic acids that make the plant moderately deer-resistant and generally unpalatable to rabbits and other generalist herbivores. Deer may browse a few leaves in winter when other forage is scarce, but they do not preferentially seek out heartleaf. Slugs and snails occasionally rasp the leaf surface in very wet springs but rarely cause significant damage to the leathery foliage.

Horticulture & Care

[ shade groundcover · slow establishment · propagation · companion plants ]

Site selection & soil

Heartleaf is a shade specialist for the forest floor. Plant it in deep to dappled shade under mature hardwoods (oaks, hickories, maples), on the north side of buildings, or in any cool, shaded area where few other perennials thrive. It prefers acidic, humus-rich, well-drained soil with a deep layer of leaf litter. In NE Oklahoma, the native soils under oak-hickory forest are naturally acidic and ideal. On alkaline or heavy clay soils, amend with 3–4 in of pine bark fines, peat moss, and leaf mold, and plant on a slight slope or raised area to ensure drainage.

Planting: Plant container-grown divisions or bare-root rhizomes in spring or fall. Set rhizomes horizontally 1–2 in deep.
Spacing: 8–12 in apart for a solid mat in 3–4 years. This is a slow grower — be patient.
Water: Water during establishment and during prolonged summer drought. Mature stands are moderately drought-tolerant.
Mulch: A permanent 2–3 in layer of shredded oak leaves or pine straw is the ideal mulch. Renew annually in fall.

Propagation

Division is the most practical method. Dig rhizomes in early spring or fall and cut into sections, each with at least 2–3 leaves and some roots. Replant immediately into prepared soil and keep moist. Seed propagation is possible but slow: collect ripe seed, remove the fleshy elaiosome, and sow immediately in a shaded nursery bed. Seeds require warm-moist stratification followed by cold-moist and typically germinate the second spring after sowing. Seedlings reach transplant size in 2–3 years.

Pests & diseases

Slugs & snails — minor leaf grazing in wet conditions. The leathery texture limits damage.
Root rot — in poorly drained, compacted, or waterlogged soil. Ensure good drainage.
No significant insect pests or diseases. This is a very low-maintenance species once established.

Companion plants in a woodland garden

Heartleaf is a foundational groundcover in the woodland garden matrix. Layer it with other shade-loving species: Christmas fern (Polystichum acrostichoides) and maidenhair fern (Adiantum pedatum) for upright texture, wild ginger (Asarum canadense) for a deciduous groundcover contrast, bloodroot and trilliums for spring ephemeral interest, false Solomon's seal for 2–3 ft architectural height, green dragon (Arisaema dracontium) and Jack-in-the-pulpit for curiosity value, and American alumroot (Heuchera americana) for textural contrast. Under oaks, interplant with Leavenworth's sedge on the drier edges and eastern woodland sedge in the moister zones.

A connoisseur's groundcover: Heartleaf is not for the impatient gardener. A planting takes 3–5 years to fill in to a solid mat, and the flowers are virtually invisible. But the reward is a dark, glossy, evergreen tapestry that looks more like a piece of the primeval forest floor than anything you can buy at a big-box store. It is a plant for gardeners who love texture, shade, and subtlety.

Cultural & Traditional Uses

Like its cousin Asarum canadense, heartleaf has a history of traditional use by Indigenous peoples and folk herbalists:

Medicine: The aromatic rhizome was used by several southeastern tribes (Cherokee, Creek, Choctaw) as a digestive aid, carminative (gas relief), and mild stimulant, prepared as a tea or chewed directly. It was also used externally as a poultice for skin conditions.
Flavoring: The ginger-scented rhizome was used sparingly as a flavoring and as a seasoning for game meats and stews.

Caution: Plants in the Aristolochiaceae family contain aristolochic acids, which are known nephrotoxins (kidney toxins) and carcinogens. Do not consume any part of heartleaf in any quantity. Traditional uses involved specific preparation methods and small doses; modern medical knowledge advises against ingestion.

Sources & Further Reading

USDA NRCS PLANTS Database — Hexastylis arifolia: plants.usda.gov/plant-profile/HEAR6
Lady Bird Johnson Wildflower Center — Native Plant Database: wildflower.org — HEAR6
Flora of North America — Hexastylis arifolia (Vol. 3): Aristolochiaceae.
Cullina, W. (2000). Wildflowers: A Guide to Growing and Propagating Native Flowers of North America. Houghton Mifflin.
Weakley, A.S. (2020). Flora of the Southeastern United States. UNC Herbarium, North Carolina Botanical Garden.
Wikipedia — Hexastylis arifolia: en.wikipedia.org/wiki/Hexastylis_arifolia

Hero photo: Rooted Revival.