Winterberry
Ilex verticillata
Winterberry blooms from October through December.
Mature size, hardiness zones, sun and the trait tags were checked against named botanical sources for this plant. The bloom months and water need on this page were not.
Growing Winterberry
Plant it in full sun. It prefers high water. It is hardy in USDA zones 3–9. Expect it to reach about 6.6 ft tall and 6.6 ft wide at maturity, in roughly 5 years.
When to plant Winterberry
Plant Winterberry in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. For the middle of its hardy zones 3 to 9 range, spring means March to May and fall means August or September. Once settled, it blooms from October to December.
Month-by-month timing for your zone is on the planting calendar: for the middle of its range, start with zone 6 in March.
Comes in 5 varieties across 2 colors
Same plant, same care - pick the color you are growing.
Good to know about Winterberry
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
The berries and leaves are toxic if eaten, by people and pets alike, though low severity. The toxin is saponins, causing vomiting, diarrhea, and depression. per ASPCA and NC State
Worth knowing
Winterberry is dioecious: only female plants make the red berries, and only if a compatible male that blooms at the same time grows nearby. One plant fruits nothing. per NC State
Alkaline soil is a dealbreaker
Most sources say it must have acid soil and goes chlorotic, even dies, in alkaline ground. One outlier (Illinois) claims it tolerates alkaline. Treat it as acid-only. per NC State and Clemson
How many males, how close
Plant at least one bloom-matched male within about 40 to 50 ft of the females. One male can cover roughly 5 to 20 females; closer spacing means more berries. per NC State and Clemson
The winter berry display
After the leaves drop, bright red berries cling to the bare stems well into winter. That bare-stem show is the plant's whole point; leave the fruit on. per NC State
Feeds over 48 bird species
The persistent red fruit is important winter food for birds and small mammals; NC State and Clemson say over 48 species eat it, cedar waxwings among them. per NC State and Clemson
Spreads into thickets
It spreads by root suckers into thickets, strongest in moist soil. A plus for naturalizing and wildlife cover; for a tidy single shrub, remove suckers now and then. per Clemson and Penn State
What pairs well with Winterberry
Good companions share its growing conditions and add something it lacks: an earlier or later bloom, a lower carpet in front, or structure through winter.
Joe Pye Weed
Shares full sun and high water; blooms in midsummer, before this one opens; its seed heads stand through winter, for structure and the birds; both are native plants.
Sneezeweed
Shares full sun and moderate to high water; blooms in midsummer, before this one opens; its seed heads stand through winter, for structure and the birds; both are native plants.
Turtlehead
Takes full sun to part sun and high water; blooms in late summer, before this one opens; lower at 3 ft, for the front of the border; both are native plants.
Calibrachoa
Shares full sun and moderate to high water; opens in late spring and overlaps into this one's season; low at 8 in, to carpet the ground beneath; orange sits close to red on the wheel.
Bacopa
Takes full sun to part sun and moderate to high water; opens in late spring and overlaps into this one's season; low at 6 in, to carpet the ground beneath; its white flowers settle the red.
Lobelia
Takes full sun to part sun and moderate to high water; blooms in late spring, before this one opens; low at 8 in, to carpet the ground beneath.
Trumpet Vine
Shares full sun and moderate to high water; blooms in early summer, before this one opens; climbs to 26 ft behind it, height without the footprint; both are native plants.
Arborvitae
Shares full sun and moderate to high water; evergreen, so the bed keeps its shape through winter; taller at 20 ft, for the layer behind it; both are native plants.
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