Blue Holly is a cold-hardy evergreen shrub born from a bold mid-century breeding program in upstate New York. In the 1950s, horticulturist Kathleen K. Meserve crossed English holly with Tsuru holly to create a hybrid that could survive harsh northeastern winters while maintaining the elegant appearance of classic English holly. This female clone grows 10 to 15 feet tall and produces showy red berries when pollinated by a male counterpart, thriving in zones 4 through 7 with minimal fuss.
Partial Sun
Moderate
4-7
180in H x 120in W
—
Low
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Blue Holly arrived at a time when gardeners in cold climates couldn't grow the iconic English holly they admired. Meserve's decades-long breeding work cracked that problem, delivering a plant that looks like a traditional holly yet withstands winters that would kill its ancestors. The dense, evergreen foliage creates year-round structure in the landscape, while late spring flowers give way to brilliant berries that attract birds through fall and winter. It handles urban pollution and city conditions with grace, making it unusually tough for formal hedging.
Blue Holly serves as an elegant evergreen hedge, especially in regions with cold winters where traditional English holly cannot survive. Its dense branching and showy winter berries make it equally valuable as a specimen plant in mixed borders or foundation plantings. The bright red fruit attracts birds, adding winter wildlife interest when food sources are scarce. In formal gardens and landscapes, it provides year-round structure and definition, thriving in urban settings where pollution and salt spray would stress other evergreens.
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“The story of Blue Holly begins with Kathleen K. Meserve, a Long Island gardener who spent the 1950s pursuing an ambitious vision: breeding an English-style holly that could survive the brutal winters of the northeastern United States. At her home in St. James, New York, she crossed Ilex aquifolium (English holly, hardy only to zone 7) with Ilex rugosa (Tsuru holly, hardy to zone 3). The result was a new hybrid species, Ilex × meserveae, that combined the ornamental qualities gardeners loved with the cold tolerance northern climates demanded. Blue Princess, the female clone, became one of the standout selections from this breeding program. Her work fundamentally changed what was possible for evergreen hedging and formal gardens across the cold Northeast, proving that breeding for hardiness didn't mean sacrificing beauty.”