Winterberry (Ilex verticillata): Deciduous Holly for Frosty Gardens

Most people know evergreen hollies, but winterberry—a deciduous holly—offers outstanding late-season color for cold-climate gardeners. Easy to love, its many cultivars provide brilliant winter interest.

Botanical name: Ilex verticillata
Common names: Winterberry, Michigan holly, coralberry, black alder
Origin: Native to eastern United States
Hardiness: Hardy to -40°F (USDA zones 3–9; find your zone)
Water requirement: Medium to wet soil; adapted to swamps and stream banks
Light requirement: Full sun to partial shade
Mature size: 6–10 feet tall and wide
Benefits and tolerances: Widely adaptable; suitable for swales, rain gardens, catchment basins, denuded areas with poor soils
Seasonal interest: Late fall through winter
When to plant: Early spring to late fall

Distinguishing Traits

Easy-care winterberry stands alone—few shrubs match its winter color brilliance. Disease-resistant, trouble-free, a good alternative to spirea or invasive Japanese barberry. Flowers are inconsequential, but after pollination in early summer, green fruits (drupes) swell and change color with shorter days and frost, attracting cedar waxwings, grosbeaks, cardinals, juncos, and other birds. Expect shrubs stripped bare by winter's end.

How to Use It

Many cultivars suit different locations and needs. At the U.S. Botanic Garden's National Garden, winterberry softens an irregular stone path, planted en masse for big impact in late fall when most else winds down (except asters). Foliage has no significant fall color, but fruits are lovely, especially orange-hued I. 'Winter Gold'. For a low-impact native garden, combine with airy switchgrass (Panicum virgatum) and narrow-leaved bluestar (Amsonia hubrichtii), both cold-hardy to zone 4.

Winterberry attracts birds and wildlife to naturalistic woodland edges, but also makes a good focal point in a sunny bed where its color draws the eye in winter. I. 'Red Sprite' is a compact dwarf (3–5 feet) good for massing on slopes or entrances. I. 'Sparkleberry', a U.S. National Arboretum introduction, grows to 15 feet and can be used as a small tree.

Planting Notes

Dioecious—male and female plants needed for fruit set. Nursery or landscape professional can guide pairings; I. 'Southern Gentlemen' and I. 'Jim Dandy' are popular male cultivars.

Best in acidic soils (pH 4.5–6.5); keep away from concrete foundations/walkways or amend planting holes to boost pH.

Gardeners in snowy northern zones know the value of winter gardens designed for dormancy interest. Cut branches make festive arrangements too.