Castle Spire(R) blue holly (Ilex × meserveae 'Castle Spire(R)') gives you a tall, narrow evergreen accent with handsome, spiny, blue-green foliage and strong four-season structure. In late spring it produces small, pale flowers; as a female selection it can set showy red berries in fall and winter when a compatible male pollinator is nearby. At maturity, expect roughly 96-120 inches tall with a tighter footprint (about 36-48 inches wide), making it useful where you want height without taking much space.

Plant it in moist, well-drained soil and keep it evenly watered through the first growing season. Once established, it appreciates consistent moisture and a mulch layer that helps keep roots cool and reduces drought stress. Full sun encourages the densest habit, but part shade is also suitable; in warmer-summer areas, a little afternoon shade can help reduce leaf scorch. This holly generally performs best in slightly acidic soils; very alkaline soils may lead to yellowing leaves.

Use Castle Spire(R) as a specimen, foundation screen, or formal vertical accent, and give it room for air circulation. Prune in late winter or early spring to shape, remove stray shoots, or maintain a crisp outline, and avoid heavy pruning in late summer so new growth can harden before winter. Wear gloves when handling, as leaves are spiny and berries are ornamental rather than edible.

Specifications

• Cold hardiness zone: 5-7 (-20 degrees F) - Contact your local extension to confirm hardiness if you are in a fringe zone (we cannot guarantee hardiness in fringe zones)
• Light: Full sun   Part sun
• Growth rate: Slow
• Mature height: 96-120"
• Spread: 36-48"
• Evergreen: Yes

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