Castle Keep® Blue Holly

Castle Keep® Blue Holly is a compact, evergreen female selection of Meserve holly, with dense, soft-textured green foliage and a naturally rounded outline. It flowers white in spring and, with a nearby male pollinator, can carry bright red berries through fall and winter. Use it for a hedge, border group, foundation planting or specimen, allowing room for a pollinator when fruit is desired. ## Form and Landscape Use The breeder describes a semi-dwarf plant 3–5 feet tall and 3–4 feet wide; Proven Winners gives the same ranges. Its dense rounded form and evergreen foliage suit a hedge, screen, border grouping, foundation planting or specimen. The soft leaves distinguish this selection from older, pricklier blue hollies. [Spring Meadow Nursery](https://springmeadownursery.com/plantfinder/castle-keep-49830) and [Proven Winners](https://www.provenwinnerscolorchoice.com/product/castle-keep-blue-holly/) describe the named selection. ## Growing Conditions Grow Castle Keep in full sun to part sun and moist, acidic, well-drained soil. Spring Meadow lists USDA Zones 5–7; Proven Winners lists Zones 5–8. Its shallow roots benefit from mulch, which helps retain moisture. Shelter the evergreen foliage from harsh winter winds and sun, and provide late-season irrigation when conditions are dry. [NC State Extension](https://plants.ces.ncsu.edu/plants/ilex-x-meserveae/) describes the hybrid's general soil and exposure needs. ## Flowers and Fruit Castle Keep is female. For fruit, plant a male holly such as Castle Wall nearby; the breeder recommends a pollinator within 50 feet and notes one male can serve up to seven females. White flowers appear in spring, and red berries can persist into winter. Birds use the fruit as food and the dense foliage as cover. Stems with berries can also be cut for holiday arrangements. [Spring Meadow Nursery](https://springmeadownursery.com/plantfinder/castle-keep-49830) and [Proven Winners](https://www.provenwinnerscolorchoice.com/product/castle-keep-blue-holly/) give selection-specific fruit and pollination details. ## Maintenance Avoid routine shearing after bloom because the shrub flowers on old wood and pruning can remove developing fruit. If shaping is needed, make selective cuts in late winter or early spring. Mulch and regular water help maintain moisture around its shallow roots; routine fertilizer is not necessary, though spring feeding is optional.