Boxwood Years to 9 feet tall - Knowledgebase Question

Mt Shasta, CA
Avatar for gsiela
Question by gsiela
October 21, 2005
I am interested in 3 Monrovia boxwoods for Mt Shasta area. One states slow grower, another slow to moderate and the last moderate. How long will it take the following boxwoods to reach 9 feet tall for a screen between houses.

1. Buxus sempervirens 'Fastigata' / Columnar common, 9 Feet in X yrs
2. Buxus sempervirens 'Monroe' / Green Tower, 9 Feet in X yrs
3. Buxus sempervirens 'Variegata' / Varigated English, 9 Feet in X yrs

Do you recommend any other boxwood that definetly goes above a six foot fenceline, minimum 8 feet to 10 feet, with a narrow width to 3 feet in PART SHADE, in zone -20 to -10.

Thank you very much for your time.

Answer from NGA
October 21, 2005
Rate of growth really depends upon the growing conditions. For your purposes, I'd eliminate 'Variegata' and concentrate on your other two choices:

Buxus sempervirens 'Fastigiata', in 20 years, will reach a mature height of 10 to 12 feet, with a spread of 4 to 5 feet. Best grown in average, medium wet, well-drained soil in full sun to part shade. Prefers sun-dappled part shade and moist, sandy loams with a slightly acidic to slightly alkaline pH. Tolerant of pruning and shearing. Avoid cultivating around plants because they have shallow roots. Roots appreciate a good mulch (1-2 "). Thin plants and remove dead/damaged branches annually to improve air circulation. In USDA Zones 5 and 6, this boxwood is best sited in a sheltered location which protects it in winter from strong winds and full sun. Carefully remove heavy snow accumulations as quickly as practicable to minimize stem/branch damage.

Buxus sempervirens Monrue (Boxwood Green Tower) Reaches 9 feet tall, but is never more than 2 feet wide. The habit of this plant is very dense, yet it keeps its neat, straight-up-and-down shape, as if you'd just finished shearing it. In fact, you never have to do a thing to the foliage, but if you want to shape it, Green Tower is dense enough to create topiary without leaving unsightly gaps and holes.

The foliage is medium- to fine-textured, giving Green Tower a full, solid look even from a young age. Expect it to reach about 5 feet tall within 5 years (9' tall in 10 years) in partial shade.

Buxus sempervirens 'Variegata' is a dense round evergreen shrub. Very slow growing to maybe 5' in 20 years. The variegation changes with the season, from white to cream to yellow.

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