The Castle™ series brings compact, pyramidal forms to the world of blue holly. Their dark glossy leaves, superior vigor and branching make them an improvement over other older varieties. Narrow form makes them great for hedges, foundation plantings, or even as a dramatic specimen. The lustrous green foliage provides season long interest. Though it is handsome enough to be used on its own, Castle Wall ® is a male pollinator for Castle Spire ® and Castle Keep ® hollies.