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Winter Gem Boxwood: Cold‑Hardy Cultivar for Zones 4–5

Overview

‘Winter Gem’ (Buxus microphylla ‘Winter Gem’) forms a dense, rounded 3–5 ft shrub prized for exceptional winter hardiness. Foliage blushes bronze in cold, then erupts in bright yellow‑green spring growth.

Origins & Classification

A littleleaf boxwood cultivar with muddy taxonomy—listed variously as var. koreana, var. japonica, or a hybrid sport. Exact lineage debated among botanists.

Habit & Foliage

Densely branched, mounded. Leaves smaller, more lance‑shaped than common boxwood. Spring foliage vivid yellow‑green, maturing to deep green. Winter bronzing adds ornamental value. Strong musky/skunky scent—some find it offensive.

Flowers

Tiny, star‑shaped, yellow‑green, fragrant (honey‑chocolate), appearing mid‑spring at leaf bases. Loved by bees, barely noticed by humans.

Uses & Siting

Top choice for hedges and topiary in USDA zones 4–5. Plant in partial shade, protected from winter wind/sun combo that desiccates foliage. Avoid exposed, windy sites.

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