Blue Cloak White Fir

Blue Cloak is an upright white fir cultivar with a strong central leader, graceful semi-pendulous branches, and powder-blue needles. It looks compact in its first decade, but arboretum references show that it continues into a narrow tree around 30 feet tall over several decades. ## Form and landscape use The central leader keeps a vertical outline while the side branches descend in a soft, cloaked pattern. Oregon State University reports a size of about 8 feet tall by 4 feet wide after ten years; Dawes Arboretum describes a tree around 30 feet tall and half as wide after thirty years. Treat it as a long-lived, medium-sized tree rather than a permanent small-garden conifer. Use it as a specimen or a narrow evergreen screen where the eventual dimensions fit. ## Growing conditions Plant in full sun and deep, moist but well-drained soil. The Royal Horticultural Society lists clay, loam, and sand as suitable textures when drainage is good, with acid to neutral soil chemistry. Avoid persistently wet sites. Hardiness listings vary: Oregon State University lists USDA Zone 4, while Dawes Arboretum lists Zone 3, so verify local performance at a cold boundary. The American Conifer Society classifies its growth rate as intermediate. ## Cultivar background The American Conifer Society lists the cultivar’s origin as unknown. Its database mentions a possible late-1990s University of Michigan seedling selection but explicitly describes that history as speculative, so this entry does not assign a confirmed breeder. ## Sources - [Oregon State University: Blue Cloak White Fir](https://landscapeplants.oregonstate.edu/plants/abies-concolor-blue-cloak) — ten-year size, foliage, form, and USDA hardiness. - [Dawes Arboretum: *Abies concolor* ‘Blue Cloak’](https://dawesarb.arboretumexplorer.org/taxon-19135.aspx) — thirty-year size and hardiness listing. - [American Conifer Society: Blue Cloak](https://conifersociety.org/conifers/abies-concolor-blue-cloak) — cultivar profile, growth rate, and uncertain origin. - [Royal Horticultural Society: White Fir ‘Blue Cloak’](https://www.rhs.org.uk/plants/238658/abies-concolor-blue-cloak/details) — soil, light, cultivation, and pruning. ## Maintenance This is a low-pruning conifer: the RHS says no routine pruning is required. Keep the central leader intact, water deeply while a new planting establishes, and avoid chronic overwatering or poorly drained soil. Remove broken or dead branches if needed; inspect new growth for fir aphids or adelgids where they occur locally.