The U.S. National Arboretum presents the elegant Viburnum plicatum f. tomentosum 'Shasta', the first doublefile viburnum cultivar to result from a breeding program. A magnificent profusion of extra large, pure white flowers in May plus a shorter, more horizontal growth habit make 'Shasta' a shrub without equal. Bright red fruits are a brief ornamental attraction in late July before providing a summer picnic for robins and other fruit-eating birds.
Recognition:The Pennsylvania Horticultural Society Gold Medal Plant Award, 1991.
|'Shasta' Doublefile Viburnum|
|Botanical Name:|| Viburnum plicatum
Thunb. f. tomentosum (Thunb.) Rehd. 'Shasta'|
(NA 36800; PI 427119)
|Hardiness:||U.S.D.A. Zones 5b - 8|
|Development:||'Shasta' is the first doublefile viburnum cultivar to result from a breeding program for viburnum improvement. In 1954 a select V. plicatum f. tomentosum plant was crossed with V. plicatum f. tomentosum 'Mariesii'. From the 2nd generation of this hybrid population, a superior plant was selected in 1968, named and released in 1979.|
|Significance:||The abundant, large, lacecap inflorescences have sterile marginal florets that are 1 1/2 times larger than those found on other cultivars, and often have 5-15 inner sterile florets dispersed among the center fertile flowers. The growth habit is strongly horizontal, twice as wide as high.|
Height and Width: 6.5 feet tall and 11.5 feet wide.|
Habit: Deciduous, strongly horizontal, large shrub, twice as wide as high.
Foliage: Dark green leaves with 8-12 pairs of nearly straight veins. Fall coloration is dull purplish-red to maroon.
Flowers: Abundant, large (4-6 inches), flat to mounded cymes in double rows along branches with 5-7 outer marginal florets larger than a half dollar, additional 5-15 inner sterile florets dispersed among inner fertile flowers.
Fruit: A drupe. Bright red, upright fruit clusters ornamental for several weeks in late July.
|Culture:||'Shasta' is readily cultivated under diverse climatic and soil conditions. It grows well in many exposures and soils, but does best in full sun with moderate moisture and well-drained soils. Requires light shade in more southern areas.|
|Propagation:||Roots easily from semi-hardwood cuttings under mist, 1000 ppm IBA, in 2-4 weeks.|
|Landscape Use:||Specimen plant, massed group, shrub border, good horizontal element in the landscape, particularly effective planted so as to be viewed from above.|
|Availability:||Readily available from mail-order firms and retail and wholesale nurseries.|
U.S. National Arboretum Plant Introduction
U.S. National Arboretum, U.S. Department of Agriculture, Agricultural Research Service,
3501 New York Ave., N.E., Washington, DC 20002
Last Updated January 14, 2002
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