Buxus sempervirens 'Clembrook' (Clembrook Boxwood)


Botanical Information

FamilyBuxaceae
GenusBuxus
Speciessempervirens
Cultivar'Clembrook'
CategoryWoody
TypeShrub (evergreen)

Details

USDA Hardiness Zone6
USDA Hardiness Ref.
Canadian Hardiness Zone5 - 6a
Canada Hardiness Ref.
RHS Hardiness ZoneH6 - H7 (with protection)
RHS Hardiness Ref.
Temperature (°C)-23 - (-18)
Temperature (°F)-10 - 0
Height120 - 180 cm
GrowthSlow
Flowering PeriodMay, June

Description and Growing Information

General DescriptionAn upright, weeping plant with evergreen foliage.
ShapeRounded evergreen shrub.
LandscapeMakes for an excellent shrub border or hedge.
PropagationPropagate in mid-summer by taking semi-ripe cuttings from the current season's growth. Collect in the early morning using a sharp knife to cut pieces 10 - 15 cm in length. Remove all leaves from the lower third and pinch out any soft terminal growth. Dip into a number 2 rooting hormone, insert into trays or pots of cutting compost (50/50 mix of compost and sharp sand or perlite) and water well. Place in a propagator with bottom heat set at 15°C with or without mist; rooting should occur in 4 - 6 weeks.
PestsAs of late Boxwood blight has become a major problem both in Europe and most of North America. The fungus Cylindrocladium buxicola causes leaf spots, defoliation and even extensive die-back. The disease can be spread by water splash, tools and footwear and can survive for up to six years in the soil. It thrives in moist, humid environments but is killed when exposed to temperatures in excess of 33 °C for at least a week. The disease also affects Pachysandra, Sarocococca and Buxus balearica, sinica, macowanii, microphylla, bodinieri, glomerata, harlandii, sempervirens and riparia.
Notable SpecimensRoyal Botanical Gardens, Burlington, Ontario, Canada.
HabitatHorticultural origin.

Photographs