Cornus alternifolia
Pagoda Dogwood
Mature Size, Growth, Longevity
Average mature size of 15-25' tall and 20-35' wide. Usually grows as a horizontal-branched, spreading tree with low tiers of branches, or sometimes as a large shrub. Initially has a slow growth rate, but becomes medium when established. This has a medium genetic longevity potential of 100-200 years, unless brought down by twig blight or canker disease.
Native Range
Kentucky Native — New Brunswick to Minnesota south to Georgia and Alabama. Introduced 1760. Native to northern and eastern Kentucky, and much of the N.E. United States.
Flower and Fruit Details
Flowers are yellowish-white, extremely fragrant, borne in flat-topped, 1.5-3" diameter clusters (cymes) of small, individual flowers. Effective for 7-10 days in May-early June. Fruits are showy drupes, starting green, changing to red, then finally to blue-black at maturity, bloomy, 0.25-0.33" across, July-August, not long-lasting. The fruit stalk turns a pinkish-red.
Leaf and Bark Features
Deciduous: Leaves alternate, but crowded at ends of twigs, sometimes appearing to be whorled, 2-5" long and 1-2.5" wide, with 5-6 pairs of veins, ovate, acuminate, medium to dark green, with entire margin. Petiole is 1-2" long. Fall color usually not outstanding, but can be reddish purple. Bark on first and second year stems is often lustrous brown to purple; older bark is gray and slightly ridged and furrowed. Young twigs usually greenish, reddish, or purplish.
Culture and Care
Transplant as a young plant since it develops a fibrous root system. Requires moist, acid, well-drained, cool soil. Prefers a partially shaded site, but may tolerate full sun locations. 3" of mulch is beneficial to keep roots cool and moist. Zones 3-7. Leaf spot fungus may be a problem after a wet spring, and twig blight or canker can be a serious problem after the trunk reaches a 4" diameter.
Strengths, Weaknesses, Other Facts
Very tolerant of shade. Good wildlife value. 4-season interest: Spring, Summer, Fall, Winter. Somewhat weak-wooded. Benefits from a site protected from strong winds. Sensitive to 2,4-D herbicide drift. Not drought/heat tolerant. Songbirds love the fruits. Medium flood tolerance.
Suggested Uses
Often used for naturalizing, as a specimen in the woodland garden, or in a native plant garden, or in the shrub border, or anywhere there is a need for strong, horizontal lines, since it has such a habit.
Taxa and Plants of this Species at BCA
The following taxa are (or were) represented in the collections at Boone County Arboretum. Additional taxa may be available in the trade that are not included here.
Cornus alternifolia 'W. Stackman' // Golden Shadows® Pagoda Dogwood
Tree. Variegated leaves are yellowish or chartreuse along the margins, changing to creamy-white margins as the leaf matures. Needs partial or filtered shade. May lose color in heavy shade. Leaves may burn in full sun. More vigorous than other variegated forms. Discovered as a branch sport of the species by Walter Stackman of West Chicago, Illinois, and introduced in 1997. Pruning is seldom needed. Reddish-purple fall foliage color. Often sold as a large, multi-stemmed shrub, getting 10-15' tall and 15-20' wide.
BT001834