// SPECIES PROFILE · TREE · NATIVE · DIOECIOUS

Sassafras

Sassafras albidum

Sassafras is the genus that broke the rule that "every leaf on a branch looks the same." On a single twig you will find three different leaf shapes at once — a simple oval, a two-lobed mitten, and a three-lobed trident — an arrangement found in only a handful of woody plants worldwide. Crush a twig or a leaf and the wood gives off a sweet, spicy, distinctly American aroma: this is the tree whose root bark flavored the original root beer and the file´ powder of Louisiana gumbos. In NE Oklahoma it lives at the western edge of its range, scattered through the Ozark and Ouachita uplands and the eastern Cross Timbers, where it produces some of the most spectacular fall color — molten orange, scarlet, salmon and gold — of any native tree.

// QUICK FACTS

Family: Lauraceae (laurel family)
Group: Deciduous tree
Native range: SE Canada through E US west to E Texas / E Oklahoma
USDA hardiness: Zones 4–9 (Tulsa = 7a/7b)
Mature size: 30–60 ft typical · to 100 ft on best Ozark sites
Crown form: Open, layered, sympodial — "candelabra" branching
Sex: Dioecious — separate male & female trees
Bloom time: March – April (yellow racemes, before leaf-out)
Fruit ripe: August – September (dark blue drupe on red pedicel, female trees only)
Sun: Full sun to part shade (best fall color in sun)
Soil: Acidic, well-drained sandy / loamy / chert; intolerant of high pH; pH 5.5–8.0
Water: Adaptable; drought-tolerant once established
Larval host: Spicebush swallowtail · Eastern tiger swallowtail · Promethea moth
Wildlife value: 30+ bird spp on fruit · deer browse · pollinator nectar

Sassafras (Sassafras albidum) — foliage showing the characteristic three leaf shapes on one branch — *Sassafras albidum*. Photo via Wikipedia / Wikimedia Commons.

Identification

[ field key — three leaf shapes · aromatic twigs · sympodial branching ]

Habit & Bark

Small to medium tree with a distinctive open, layered, almost candelabra-like crown — the result of a sympodial branching pattern in which each year's lead shoot dies back and lateral buds take over, producing tiered horizontal layers of foliage. Mature trunks 12–30 in dbh, occasionally larger in deep Ozark coves. Bark is thick, deeply furrowed, reddish-brown to gray-brown with flat-topped ridges — on a freshly cut surface the inner bark and sapwood are pale yellow-orange and intensely fragrant. Forms extensive clonal thickets from root suckers around any parent tree.

Leaves — the three shapes

The diagnostic feature, found on every sassafras and on no other tree in the eastern US: three distinct leaf shapes occur together on the same branch:

Unlobed: simple ovate leaf, like a smooth elm.
Mitten: two-lobed, with a single lateral "thumb" — left-handed and right-handed mittens both occur.
Trident: three-lobed, with two equal lateral lobes and one central lobe.

All three forms are alternate, 3–6 in long, with smooth margins, soft texture, and a strong sweet citrus-spice aroma when crushed. Petioles and young twigs are bright yellow-green.

Flowers, Fruit & Sex

Dioecious: male and female flowers on separate trees. In March–April, before leaf-out, both sexes produce small bright yellow-green flowers in 1–2 in racemes at the ends of twigs — one of the earliest sources of nectar in the regional spring. Female trees follow with dark blue, ovoid drupes (~10 mm) held on bright scarlet pedicels in a small cup, ripening in late summer and stripped quickly by birds. The combination of blue fruit on red stem is unmistakable.

Fall Color & Confusables

Fall color in NE Oklahoma is among the most spectacular of any native tree: a single canopy can show yellow, orange, salmon, scarlet and burgundy at once, often peaking late October to early November. Confusable in winter only with red mulberry, but mulberry has no aromatic bark. The leaf shapes are unmistakable in the growing season — if you find a tree with three leaf shapes and a sweet citrus-spice smell, it is sassafras. Spicebush (Lindera benzoin) is the closest aromatic Lauraceae relative in our region but is a small shrub with single-shaped elliptic leaves.

Habitat & Range in NE Oklahoma

Sassafras reaches its western range limit in eastern Oklahoma. It is common in the Ozark Highlands of Adair, Cherokee, Delaware and Sequoyah counties, common in the Ouachita Mountains of Le Flore and McCurtain counties, scattered through the eastern Cross Timbers from Tulsa east, and effectively absent from the western half of the state where soil pH and drought exceed its tolerance. In the Tulsa metro itself it is uncommon as a wild tree but plants well on the slightly acidic sandstone soils of the Osage Hills, the Tulsa University area, and the Arkansas River bluffs.

Ecologically, sassafras is a pioneer / mid-successional species that colonizes old fields, fence rows, fire-disturbed uplands, and timber clearings on acidic, well-drained, sandy or chert soils. It is highly shade-intolerant in the seedling stage but will hold a place in the mid-canopy of an oak-hickory forest for decades. Like persimmon, it spreads aggressively by root suckers, often forming pure clonal thickets from a single seed-grown parent — the entire grove may be genetically identical and all one sex. This clonal habit explains the otherwise puzzling pattern of dense fruiting groves adjacent to identical-looking groves with no fruit at all: those second groves are male.

Ecology & Wildlife Value

[ swallowtails · spring nectar · bird fruit · deer browse ]

Lepidoptera — the swallowtails

Sassafras and its sister-shrub spicebush are the obligate primary larval hosts of the spicebush swallowtail (Papilio troilus) — one of the most spectacular butterflies in eastern North America, whose green caterpillars with their disquieting "fake snake eyes" fold sassafras leaves into silk-lined nests. Also a primary host of the eastern tiger swallowtail (Papilio glaucus) and the promethea moth (Callosamia promethea). Without sassafras and spicebush in our woodlands, two of our most charismatic butterflies cannot complete their life cycle.

Spring pollinators

The early-spring yellow racemes — opening before most other woody plants leaf out — are a critical first nectar source for emerging queen bumblebees, mining bees (Andrena), and small flies. Honey bees use them heavily where colonies overwinter. Bloom typically coincides with redbud and serviceberry across the eastern Cross Timbers.

Birds & Mammals

The lipid-rich blue drupes are taken by 30+ bird species during late summer and fall migration: wood thrush, gray catbird, northern flicker, pileated woodpecker, eastern kingbird, great crested flycatcher, eastern phoebe, scarlet and summer tanagers, rose-breasted grosbeak, and yellow-throated vireo. White-tailed deer browse twigs and seedlings heavily — in fact, deer pressure is one of the main checks on sassafras regeneration in eastern OK woodlands. Black bears (where they occur in the Ouachitas) consume the fruit.

Allelopathy & soil

Sassafras leaves and roots produce mild allelopathic compounds that suppress some understory competitors — a contributor to the species' tendency to form near-pure clonal thickets. The deep taproot helps cycle minerals from depth, and leaf litter is moderately rich in calcium and magnesium, contributing to soil-building on poor acidic upland sites.

Safrole — the FDA root-beer story: The aromatic compound safrole, which gives sassafras its distinctive scent, was banned by the US FDA from commercial food and beverage use in 1960 following rodent studies linking high doses to liver cancer. Modern commercial root beer is flavored with safrole-free sassafras extract or with synthetic substitutes. Casual home use (occasional tea from young roots) is not considered acutely dangerous, but should be limited; pregnant or nursing women and people with liver conditions should avoid it. Children should not consume it.

Sex & siting for fruit: Because sassafras is dioecious and spreads clonally, a single planted tree may never produce fruit. To establish a fruiting grove for wildlife, plant 3–5 seedlings from different seed sources spaced 20–30 ft apart and accept that you will not know the sex of each until they begin flowering at 6–10 years of age.

Horticulture & Care

[ siting · planting · pruning · pests · sourcing ]

When to plant intentionally

Sassafras earns a place in any NE Oklahoma landscape that has the right soil and enough room. It is an outstanding small-to-medium native tree for naturalized borders, hedgerows, woodland edges, restoration plantings, and specimen use where you want fall-color drama. It does not belong in tight foundation plantings, in alkaline soils (much of the western Tulsa metro on limestone-derived clays), or where the suckering habit will become a maintenance problem.

Planting & establishment

Season: bare-root in late winter / early spring, or container stock in fall. Sassafras is notoriously difficult to transplant because of a deep brittle taproot — small seedlings (under 24 in) transplant much more reliably than larger stock.
Sun: full sun for best fall color and form; tolerates substantial shade as a juvenile but needs a canopy gap to grow into a tree.
Soil: acidic, well-drained, sandy or loamy — this is the non-negotiable site requirement. Sassafras is intolerant of compacted, alkaline, or poorly-drained clay; it will limp along in mediocre conditions and never thrive. If your soil pH is above ~6.8, do not plant it.
Hole: 2× rootball width, same depth; backfill with native soil only. Do not amend.
Spacing: 25–40 ft from buildings and other large trees; expect a clonal grove to develop.
Water: deep weekly soaks during the first two growing seasons; minimal supplemental water once established.
Mulch: 3" wood-chip ring; do not fertilize.

Pruning & suckers

Prune lightly, in late winter, to remove crossing branches and shape the natural layered crown — do not over-prune the candelabra form. Root suckers will appear in a 10–20 ft radius around the parent tree; mow them to maintain a single specimen, or allow them to develop into a multi-trunked grove. Sassafras resprouts vigorously from the stump after damage.

Pests & diseases

Generally healthy — sassafras has no major pest problems in NE Oklahoma.
Laurel wilt disease (Raffaelea lauricola, vectored by redbay ambrosia beetle) is the major emerging threat to all Lauraceae in eastern North America. As of the early 2020s the disease has reached Mississippi, Alabama, and parts of Arkansas; monitor regional Forest Service bulletins for Oklahoma occurrence. Do not move firewood.
Japanese beetles may skeletonize foliage in heavy infestations; cosmetic.
Sassafras weevil (Odontopus calceatus) leaf-mines young leaves; minor.

Cultivars & sourcing

Sassafras is essentially never sold as named cultivars. Buy seedling stock from regional native-plant nurseries (Sunshine Nursery, Wild Things Nursery, the OSU Forestry Services Forest Regeneration Center, the Missouri Department of Conservation George O. White Nursery), or grow from locally collected seed (cold-stratify 90–120 days). For a fruiting grove, buy seedlings from at least two unrelated seed sources to ensure both sexes.

Cultural & Material Uses

Few American trees have so deep a cultural footprint. From pre-contact Indigenous medicine to colonial-era export, from Cajun cooking to the soft-drink aisle, sassafras has been continuously used for over 500 years.

Indigenous medicine: Documented use across many eastern nations — Choctaw, Chickasaw, Cherokee, Creek (Muscogee), Seminole, Iroquois, Algonquian and others — as a spring tonic, blood purifier, febrifuge, and treatment for skin conditions and insect bites. Root bark tea and leaf decoctions were the most common preparations.
File´ powder — Choctaw / Louisiana Creole cuisine: Dried and powdered young sassafras leaves are file´ powder — the traditional thickening and flavoring agent for Louisiana gumbo, introduced to French and Creole cuisine by the Choctaw of southern Mississippi and Louisiana. File´ contains negligible safrole and is not subject to the FDA root-bark restriction; it remains in everyday culinary use across the Gulf states.
Root beer: Sassafras root bark was the original principal flavoring agent in root beer from the mid-19th century until the 1960 FDA ban. Charles Hires's commercial "Hires Root Beer" (1876) was sassafras-based. Modern root beer uses safrole-free extract or synthetic flavoring.
Colonial export: One of the first commercial exports from the New World to England — in the late 1500s and early 1600s, sassafras root bark was traded as a (largely speculative) cure for syphilis, fevers and "the pox," briefly commanding higher prices per pound than tobacco. It is documented in the cargo manifest of the Jamestown colony.
Wood: Soft, lightweight, brittle, with a coarse grain and a pale orange-brown color. Naturally durable in contact with the ground — used historically for fence posts, rail ties, ox yokes, well buckets, fence rails, dugout canoes, and small boat construction. Aromatic when freshly cut; holds its scent for years. Modern small-shop woodworkers use it for boxes, bowls, and craft items where the orange color and aroma are wanted.
Essential oil: Steam-distilled from root bark, sassafras oil is 80–90% safrole and is now restricted commercially because safrole is a precursor to the synthesis of MDMA — sassafras oil is a US DEA Schedule I List I chemical. Legitimate small-batch use (for soap, perfumery) requires regulatory awareness.
Tea: Casual home preparation of sassafras-root tea remains widely practiced in the Ozarks and Ouachitas as a traditional spring tonic — consumed with the safrole caveats noted above. Bark from young root suckers is the traditional source.

Sources & Further Reading

USDA NRCS PLANTS Database — Sassafras albidum: plants.usda.gov/plant-profile/SAAL5
USDA Forest Service Silvics of North America, Vol. 2 (Hardwoods) — Griggs, M.M., Sassafras albidum: srs.fs.usda.gov/pubs/misc/ag_654 — sassafras/albidum
USDA Forest Service Fire Effects Information System (FEIS) — Sassafras albidum: fs.usda.gov/database/feis/plants/tree/sasalb
Lady Bird Johnson Wildflower Center — Sassafras albidum: wildflower.org — SAAL5
Missouri Botanical Garden Plant Finder — Sassafras albidum cultural and design profile.
Oklahoma Forestry Services — Trees of Oklahoma; OSU Extension Tree Species for Oklahoma Landscapes.
USDA APHIS / US Forest Service — Laurel Wilt Disease bulletins, distribution maps, and management recommendations.
Moerman, D.E. — Native American Ethnobotany Database, Sassafras albidum entries (naeb.brit.org).
FDA 21 CFR 189.180 — safrole and sassafras oil prohibition (1960).
Kamdem, D.P. & Gage, D.A. (1995), "Chemical Composition of Essential Oil from the Root Bark of Sassafras albidum," Planta Medica 61(6): 574–575.
Wikipedia — Sassafras albidum: en.wikipedia.org/wiki/Sassafras_albidum

Sassafras

Identification

Habit & Bark

Leaves — the three shapes

Flowers, Fruit & Sex

Fall Color & Confusables

Habitat & Range in NE Oklahoma

Ecology & Wildlife Value

Lepidoptera — the swallowtails

Spring pollinators

Birds & Mammals

Allelopathy & soil

Horticulture & Care

When to plant intentionally

Planting & establishment

Pruning & suckers

Pests & diseases

Cultivars & sourcing

Cultural & Material Uses

Sources & Further Reading

Companion Planting