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**'Shasta'****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)**Family:** Caprifoliaceae**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.**Description:****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** Floral and Nursery Plants Research Unit U.S. National Arboretum, U.S. Department of Agriculture,Agricultural Research Service,3501 New York Ave., N.E., Washington, DC 20002
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