Genus: Cornel

Cornus

Photo/Illustration: 
Michelle Gervais
Cornel (Cornus)
KOR-nus
Cornaceae
The 45 or so species in this genus, originating mostly in northern temperate areas, are mainly deciduous shrubs and small trees, with a few woody-based perennials, from grassland, thickets, woodland, rocky slopes, and swamps. Dogwoods are grown for their showy bracts, elegant habit, fruits, and colorful autumn leaves. Some are effective specimen trees or shrubs, especially in a woodland garden.
Noteworthy characteristics:  The fruits of many species are attractive to birds, but may cause stomach upset in humans.
Care:  Species have differing soil requirements, but those grown for their colorful winter stems show best in full sun. See species reports for pruning requirements.
Propagation: 

Sow seed in a seedbed in autumn, or stratify and sow in spring. Graft cultivars in winter. Take hardwood cuttings of those grown for their colorful winter stems in autumn.

Problems: 

Spot anthracnose (dogwood blight), powdery mildew, Discula blight, canker, bacterial leaf spot, and mushroom rot occur, while twig borers, weevils, sawfly, scale insects, aphids, leafhoppers, root knot nematodes, and thrips are common.

Species, varieties and clutivars for genus Cornus

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Redtwig dogwood
Cornus alba 'Elegantissima'
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Redtwig dogwood
Cornus alba
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Pagoda dogwood
Cornus alternifolia
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Creeping dogwood
Cornus canadensis
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Giant dogwood
Cornus controversa 'Variegata'
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Roughleaf dogwood
Cornus drummondii
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Flowering dogwood
Cornus florida
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Kousa dogwood
Cornus kousa
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Snow Lace® gray dogwood
Cornus racemosa 'Emerald'
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Red osier dogwood
Cornus stolonifera