// SPECIES PROFILE · SHRUB · NATIVE · WETLAND EDGE

Winterberry

Ilex verticillata

Winterberry is the deciduous holly — a shrub that drops every leaf in October to reveal bare gray stems absolutely encrusted with brilliant scarlet-red drupes so dense and vivid that the branches look dipped in red lacquer. It is, by any measure, one of the most spectacular winter fruit displays in the North American flora, and it comes at precisely the season when the landscape offers the gardener the least color. Ilex verticillata is a wetland-edge specialist, native to swamps, wet woods, and pond margins across the eastern US and into the eastern Cross Timbers of Oklahoma, where it reaches the western limit of its range. Like all hollies, it is dioecious — male and female flowers occur on separate plants, and you must have at least one male within pollinator range for the females to set fruit. In NE Oklahoma, Winterberry brings spectacular winter interest to rain gardens, wet meadows, pond edges, and any landscape feature with consistently moist soil. The cut branches are superlative for holiday arrangements. For sheer visual impact in the dormant season, there is nothing else like it.

// QUICK FACTS

Family: Aquifoliaceae (holly family)
Life cycle: Deciduous shrub; moderate lifespan 30–50+ yr
Native range: Eastern N. America — Canada to Florida, west to Missouri and eastern OK
USDA hardiness: Zones 3–9 (Tulsa = 7a/7b)
Mature size: 6–10 ft tall; 6–10 ft spread; suckering to form colonies
Bloom: June–July (small white, inconspicuous)
Fruit: Brilliant scarlet-red drupes, September–March
Sun: Full sun to part shade; best fruit set in full sun
Soil: Moist to wet, acidic (pH 4.5–6.5); tolerates seasonal flooding
Water: Medium to wet; requires consistent moisture
Sex: Dioecious — male pollinator required for fruit
Wildlife: Winter bird fruit · bee-pollinated flowers
Special feature: Bare stems covered in scarlet fruit through winter

Winterberry (Ilex verticillata) bare branches covered with scarlet-red drupes in winter — *Ilex verticillata* in winter — bare gray stems encrusted with brilliant scarlet drupes. Photo: Rooted Revival.

Identification

Habit & Stem

A multi-stemmed, suckering deciduous shrub forming dense colonies in favorable wet sites. Stems are slender, gray to gray-brown, with small, light-colored lenticels. The shrub has a rounded, somewhat irregular outline. In winter, the bare stems cloaked in red fruit are unmistakable.

Leaves

Alternate, simple, deciduous, 1.5–3 in long, elliptic to obovate with a sharply toothed margin. Dark green and slightly glossy above, paler and softly hairy below. Unlike the spiny, evergreen leaves of American Holly, winterberry leaves are soft, thin, and lack spines. Fall color is a muted yellow.

Flowers & Fruit

Flowers are small, white, inconspicuous, appearing in June–July at leaf axils. Male and female on separate plants. The fruit is the main event: brilliant scarlet-red drupes (sometimes orange-red), 1⁄4 in diameter, densely clustered along the stems, ripening in September and persisting through March. The contrast of bare gray wood and saturated red fruit in the dead of winter is one of the most striking sights in the native flora.

Habitat & Range in NE Oklahoma

Ilex verticillata reaches the western edge of its range in eastern Oklahoma, where it is found in swamps, wet woods, pond margins, and stream banks. It requires consistently moist to wet, acidic soil and does not tolerate drought or alkaline conditions. In NE Oklahoma, it is at home in rain gardens, wet depressions, and pond edges with full sun to partial shade.

Ecology & Wildlife Value

Winter Bird Fruit

Like American Holly, winterberry drupes are an important cold-season bird food. American robin, cedar waxwing, eastern bluebird, northern mockingbird, and hermit thrush consume the fruit through winter. The fruit is most attractive after repeated freeze-thaw cycles soften the flesh. Flocks of robins and waxwings can strip a heavily fruiting shrub in a single day.

Pollination

The summer flowers attract honey bees and small native bees. To ensure fruit, plant at least one male winterberry (e.g., 'Southern Gentleman' or 'Jim Dandy') for every 5–10 females. Males of other Ilex species that bloom simultaneously may also provide viable pollen.

Horticulture & Care

Site selection & planting

Winterberry demands consistently moist to wet, acidic soil (pH 4.5–6.5). It is the perfect shrub for a rain garden, pond margin, wet meadow, or low spot that holds water after rain. Full sun produces the heaviest fruit set. In the Tulsa area, consistent moisture is the critical success factor — this shrub will languish and decline in dry soil.

Maintenance

Pruning: Prune in late winter before new growth begins. Remove up to one-third of the oldest stems to encourage vigorous new growth, which produces the heaviest fruit.
Male selection: 'Southern Gentleman' and 'Jim Dandy' are the standard male pollinators in the nursery trade. Ensure your male flowers at the same time as your female cultivars.
Watering: Non-negotiable. Keep the soil consistently moist. A soaker hose under heavy mulch is ideal.

Companion planting

Pair with wet-tolerant natives: Buttonbush, Pickerelweed, Common Rush, Creek Sedge, and Possumhaw Holly for an extended winter fruit display. For a holly-focused winter garden, combine winterberry (deciduous, scarlet fruit on bare stems) with American Holly (evergreen, red fruit against green foliage) and Possumhaw Holly (deciduous, orange-red fruit).

Photo Reference

Sources & Further Reading

USDA NRCS PLANTS Database — Ilex verticillata: plants.usda.gov/plant-profile/ILVE
Lady Bird Johnson Wildflower Center — Native Plant Database: wildflower.org — ILVE
Dirr, M.A. (2009). Manual of Woody Landscape Plants. 6th ed. Stipes Publishing.