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Silky dogwood

Douglas Goldman / Wikimedia Commons - CC BY-SA 4.0

Silky dogwood

Cornus amomum

Silky dogwood is not the plant most people mean when they say dogwood, and settling that is the first job of this record. Cornus florida, the flowering dogwood, is a small tree carrying four huge white bracts in April. Cornus amomum is a 6 to 12 foot multi-stemmed wetland shrub whose flowers are tiny yellowish-white things in flat-topped cymes about 3 inches across, and nobody plants it for them. It is planted for blue fruit, for birds, and above all for holding wet ground and streambanks together. The second thing to settle is the winter stems, because silky dogwood is routinely bought as a cheaper stand-in for red-osier dogwood and the buyer is routinely disappointed: Missouri Botanical Garden describes the twigs as purplish brown, which is not the lacquered arterial red of Cornus sericea, and by the second or third year they have gone grey anyway. Where it genuinely beats its siblings is the fruit and the ground it will take. The drupes ripen white and then blue through August, and MBG rates the plant medium to wet while the Lady Bird Johnson Wildflower Center rates its water use high and its habitat as forested seasonal wetlands, floodplains, shrub wetlands and stream and pond banks. That is why it is one of the standard species in riparian restoration across eastern North America, usually planted as a cheap bare-root bundle from a conservation district rather than as a nursery specimen. Two honest warnings. It suckers and it layers - MBG states plainly that branches touching the ground may root at the nodes and that left alone the shrub may spread to form thickets - which is precisely the point on a streambank and a permanent chore against a tidy border. And what arrives may not be what was ordered: Cornus obliqua, the pale dogwood, is treated by many floras as a separate species and by MBG as Cornus amomum subsp. obliqua on a page of its own, the two hybridise where they meet, and conservation-grade stock sold as silky dogwood is frequently one, the other, or a mix.

Native: 27 US states + 1 CA province

Climate fit: broad (70/100)

Structure

Filler

Light

Full sun / Part shade

Water

Consistent moisture

Mature size

6-12 ft tall · 8 ft apart

Hardy in zones

5a-8b

very cold to frosty winters

Native in Illinois

Yes

Related products

Cold hardiness

These values are location-based: this location's current hardiness is the baseline, and the 2050 value is a projected future climate for this same location.

Now

Zone 6b

Plotwright

USDA Zone 6b

-5°F to 0°F

Well-suited

2050

2100

Zone 7a

Plotwright

0°F to 5°F

Well-suited

In plain terms: This location has cold winters. Its winters are projected to keep warming through 2050.

✓

Well-suited today and still thriving in 2050.

Heat tolerance

Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.

Loading AHS heat-zone data for this location...

Where this plant fits

Suitable across 34 ecoregions - 21 climate-resilient through 2070 · 5 suited today · 8 newly possible by 2070. Best matches first.

Appalachian mixed mesophytic forests

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Appalachian-Blue Ridge forests

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Arizona Mountains forests

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Atlantic coastal pine barrens

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Blue Mountains forests

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Central Pacific Northwest coastal forests

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Central-Southern Cascades Forests

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Chilean Matorral

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Colorado Rockies forests

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Cross-Timbers savanna-woodland

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What it needs

Conditions

Light

Full sun / Part shade

Water

Consistent moisture

Spacing

8 ft

Habit

Multi-stemmed, open-rounded deciduous shrub, 6 to 12 feet tall and about as wide, with the Wildflower Center recording plants to roughly 15 feet. It builds a broad thicket rather than a specimen crown, and it does so by two routes at once: new stems from the base, and low arching branches that root at the nodes wherever they rest on damp ground, so a single plant walks outward instead of merely widening. Leaves are opposite, oval to elliptic, to about 4 inches, with the strongly arcuate veins of the genus, and silky-hairy underneath - those hairs are what the name is for, and they carry on the young twigs too. Twigs are purplish brown in the first year and grey-striated by the second or third. The reliable field character, though, is not the twig but the PITH: snap a one to two year old stem and silky dogwood is dark brown inside, while red-osier dogwood is white and gray dogwood is white. That single snap separates the three faster than any amount of looking at bark colour in February.

Care tips

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Match the plant to wet ground, not the other way round. This is a facultative-wetland shrub with high water use; on a free-draining border it thins, scorches and fruits badly. Streambank, pond margin, rain garden, wet swale, low corner of a field - those are its sites. On dry ground plant gray dogwood instead.

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Do not buy it expecting red winter stems. That is red-osier dogwood. Silky dogwood twigs are purplish brown in their first year and grey by their third, and the winter display is thicket and structure rather than colour. If the brief is a red-stemmed winter block, buy the right species and stop comparing prices.

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Decide about layering before planting, because it decides how much work the plant is. Branches touching damp soil root at the nodes and the clump walks outward. On a restoration site that is the mechanism you are paying for. Against a lawn edge it means lifting the low branches or shortening them every single year.

Lifecycle

Planting

Plant in spring or autumn in average to wet, well-drained soil in full sun to part shade. Missouri Botanical Garden rates it medium to wet and lists rain garden among its uses; the Wildflower Center rates water use high and puts it in forested seasonal wetlands, floodplains, shrub wetlands and stream and pond banks. Take both at face value - this is a wetland shrub, and a dry summer on a free-draining site will scorch and thin it. MBG prefers moist, organically rich, slightly acidic ground, and the Wildflower Center records low calcium tolerance, so a high-pH limestone site is the wrong ground for it even though the soil texture list runs clay, loam and sand. Full sun gives the heaviest fruit set; MBG notes it tolerates close to full shade, which is a survival statement rather than a fruiting one.

Transplanting

Moves easily, and most of it is planted as dormant bare-root stock from state conservation-district bundles rather than as containers, which is why it turns up by the hundred along restored streams. Plant bare-root while fully dormant and keep the roots wet from lifting to planting. Established clumps resent being dug because the root system is wide, shallow and tangled with rooted layers, so move a young plant or take a rooted layer instead of lifting an old one.

Early growth

Fast, and mostly unattended. Water through the first two summers if the site is not genuinely wet, mulch 2 to 4 inches to keep the roots cool and moist as MBG advises, and otherwise leave it alone. The decision worth making early is about the layers: if the planting is a streambank, a hedgerow or a wet screen, let the branches root where they fall, because that is how the stand knits together and how the bank gets held. If it is a border, pull the low branches up off the soil or shorten them every year, and expect to keep doing it.

Maturity

Missouri Botanical Garden reports no serious insect or disease problems and then lists the real ones honestly: scale is the main susceptibility, with borers and leaf miner among the insects, and leaf spot, crown canker, blights, root rot and powdery mildew among the infrequent diseases. Two things belong alongside that list. First, DOGWOOD SAWFLY (Macremphytus tarsatus) is the pest that actually defoliates shrub dogwoods in the northeast - white wax-covered larvae in colonies on the leaf undersides in late summer that can skeletonise a plant in a fortnight; it has no entry in this wildlife catalog and so is named here rather than wired as a relationship. Second, and reassuringly, dogwood ANTHRACNOSE (Discula destructiva), the disease that has killed flowering dogwoods and Pacific dogwoods across whole landscapes, is a tree-dogwood problem and is not what limits this species. The genuine maintenance job is age: individual stems go bare at the base and lose vigour, so cut roughly a third of the oldest stems to the ground each year, or coppice the whole clump hard every few years and accept losing one season of fruit.

Propagation

Easy, and there are three routes. Dormant hardwood cuttings root readily, which is why silky dogwood is used as a live stake alongside willow in streambank work - cut pencil-thick one-year wood while dormant and push it into wet ground. Layering happens by itself: sever a rooted branch from the parent in early spring and lift it as a new plant, which is the cheapest possible propagation and needs no equipment. Seed is the slow route - clean the pulp off the drupes and expect the seed to need a cold stratification of roughly three to four months, with uneven germination even then; that figure is general Cornus practice rather than a number carried by the sources cited here. One practical point about provenance: cuttings and layers are CLONAL, so a stand raised that way is one genotype, while conservation bare-root stock is seedling-grown and genetically mixed, which matters for fruit set.

Pollination

Self-fertile (better with a partner)

Flowers are small, perfect and insect-pollinated, presented in open flat-topped cymes that any short-tongued bee or fly can work, so there is no pollinator bottleneck and no need for a named partner plant. The honest qualifier is about GENOTYPES rather than sexes. None of the sources cited here publishes a self-compatibility figure for Cornus amomum, but the practical pattern across the shrub dogwoods is that a group of genetically distinct seedlings sets heavier fruit than a single clone standing alone, and heavy fruit is the entire reason to grow this plant. That maps directly onto how it is sold: seedling-grown bare-root conservation stock is genetically mixed and fruits well, while a stand propagated from cuttings or grown on from layers of one parent is a single genotype. If the blue fruit matters, plant three or more seedling plants rather than three divisions of one.

Plants don't grow alone

Larval host

Butterfly

Spring azure (Celastrina ladon)

Cornus is a principal larval host for the spring azure complex, and the caterpillars feed on the FLOWER BUDS and developing flowers rather than the leaves, which is why an azure population tracks whether a dogwood stand blooms rather than how much foliage it carries. A practical consequence: hard coppicing the whole clump in one go removes the bloom for a season and takes the host resource with it, so renewal-prune a third of the stems at a time instead.

Pollinates

Bee

European honeybee (Apis mellifera)

The May to June cymes are open, flat and shallow, which makes the nectar available to essentially every generalist visitor, and honey bees work them steadily through a bloom that is short and heavy rather than long and thin. Every blue drupe in August traces back to those few weeks.

Pollinates

Fly

Hover flies (flower flies) (Syrphidae)

Wikipedia names flies alongside bees among the pollinators, and the flower architecture explains why: a flat-topped cyme with tiny open flowers is the classic short-tongued-insect platform. Hoverflies are the most numerous of those visitors on shrub dogwoods, and their larvae are aphid predators, so the same plant is feeding an adult pollinator and subsidising pest control in the beds around it.

Fruit forage

Bird

Cedar waxwing (Bombycilla cedrorum)

Waxwings arrive in flocks and strip a fruiting shrub in days. Silky dogwood ripens in August, which is early relative to most autumn berry crops, so a dogwood thicket is one of the first heavy fruit resources of the post-breeding season rather than a winter reserve - the opposite end of the calendar from a persistent holly crop.

Fruit forage

Bird

American robin (Turdus migratorius)

Missouri Botanical Garden lists the fruit as showy and the plant as attracting birds, and robins are among the commonest takers of shrub-dogwood drupes across eastern North America. High-fat dogwood fruit in late summer feeds the moult and the start of migration, which is why these shrubs rank so highly in bird-habitat plantings.

Fruit forage

Bird

Eastern bluebird (Sialia sialis)

Bluebirds switch from insects to fruit as the season turns, and a dogwood thicket at a field edge or a stream margin is exactly the structure they hunt from. Pair it with the open ground bluebirds need, because a dogwood stand that has closed over into a solid block gives fruit but takes away the perch-and-drop hunting the birds came for.

Fruit forage

Bird

Downy woodpecker (Dryobates pubescens)

Downy woodpeckers take fruit as a routine part of a mixed diet and dogwood drupes are among the fruits recorded for the group, but the published feeding records are at genus level and mostly on the tree dogwoods rather than specifically on Cornus amomum, so this is marked plausible rather than documented. The stems are too slender for nest cavities, so the value here is food and cover, not nesting.

Fruit forage

Mammal

Eastern gray squirrel (Sciurus carolinensis)

Wikipedia names rodents among the animals that eat the fruit and disperse the seed. Grey squirrels are the likely eastern candidate in a garden setting, but the source says rodents rather than naming a species, so this is recorded as plausible.

Foliage forage

Mammal

White-tailed deer (Odocoileus virginianus)

Read the source carefully here, because it is easy to get backwards. Missouri Botanical Garden lists DEER among this plant's tolerances, which means browsing does not destroy it, not that deer ignore it. Silky dogwood is browsed, particularly on new growth in restoration plantings, and it responds by resprouting from the base and from the rooted layers - the same trait that makes it a thicket. In a heavily browsed riparian planting expect it to survive where less resilient shrubs are eaten out, and still cage the first two seasons of growth if the local pressure is severe.

Shelter / habitat

Bird

Eastern songbirds (multi-species) (multiple species (Passeriformes))

The structure is worth as much as the fruit. A layered silky dogwood thicket on a streambank is dense low cover of exactly the kind wet-meadow and shrub-wetland birds nest in, and it is one of the reasons this species is standard in riparian restoration rather than merely tolerated there. Missouri Botanical Garden lists hedge among its uses and erosion among its tolerances, which is the same property described from the engineering side.

For people

Not eaten by humans

Not a food plant. The blue drupes are bird food, bitter and mealy to a human palate, and no source cited here records them as an edible crop - leave them for the birds, which will take them within a fortnight of ripening anyway. The one documented human use is a smoking material rather than a food: the bark was a component of the Indigenous smoking mixture kinnikinnick, which is where several of the plant's older common names come from, including kinnikinnik and red willow. That is historical and cultural context, not a recommendation. Nothing here is a serious toxicity warning either; silky dogwood simply is not a plant people eat.

Native range

Native

Naturalized

Native across 27 US states; naturalized in 1 CA province.

Worldwide native range.

Native ecoregions

Naturally belongs in 13 ecoregions - its native range crosses a state or province each one spans (not necessarily this exact habitat).

Appalachian mixed mesophytic forests

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Appalachian-Blue Ridge forests

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Atlantic coastal pine barrens

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Central Tallgrass prairie

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Eastern Canadian Forest-Boreal transition

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Eastern Great Lakes lowland forests

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Mississippi lowland forests

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Northeastern Coastal Forests

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Northeastern Hardwoods

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Piedmont

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Climate notes

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Native to eastern North America, from Ontario, Maine and New Hampshire south to Alabama, Georgia and Florida and west to Iowa, Missouri and Mississippi, in forested seasonal wetlands, floodplains, shrub wetlands, swamp borders and stream and pond banks. Provenance is worth stating exactly, because this record is the control for its batch: POWO answered directly for Cornus amomum, so the mapped range above is first-hand Kew data read from the source. POWO returned HTTP 403 for every other species in this wave, and those records took their WGSRPD rows from World Checklist of Vascular Plants data served through GBIF - the same Kew dataset - verified against this one. The Kew read for this species returned native rows only; nothing had to be excluded, which is the opposite of the two bush honeysuckles in the same wave, where the introduced rows are the single most important fact about the plant.

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The edges of that range are genuinely unsettled, and the reason is taxonomic rather than climatic. Missouri Botanical Garden describes the distribution as Newfoundland to Ontario south to Missouri, Mississippi and Florida, and Wikipedia extends it west past the Mississippi into Kansas, Nebraska and northern Oklahoma. Neither Newfoundland nor any of those western states appears in the Kew rows mapped here. Most of that disagreement traces to whether Cornus obliqua is counted as part of this species, since it is the more northern and western of the pair. Where the two treatments differ, this record maps the Kew rows and says so rather than merging the wider claims into them. Worth noting alongside all of this: Indiana lists silky dogwood as endangered statewide even though both Kew and the Wildflower Center record it there, so "native" and "common" are not the same word here.

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Wet ground is a requirement, not a preference, and it is the clearest difference between this plant and the dry-ground members of the group. The Wildflower Center rates its water use HIGH and its soil moisture moist to wet, and it is classed FACW - facultative wetland - across multiple regions, meaning it usually occurs in wetlands. Missouri Botanical Garden rates it medium to wet and lists rain garden and erosion control among its uses. It will survive ordinary garden soil, but on a free-draining site in a dry summer it thins, scorches at the leaf margins and fruits poorly, and the honest advice is to plant gray dogwood there instead, which takes dry ground and does not ask for this.

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Soil texture is easy and soil chemistry is not. The Wildflower Center records clay, loam and sand alike, but also LOW calcium tolerance, and Missouri Botanical Garden prefers moist, organically rich, slightly acidic ground. So a heavy clay floodplain is ideal and a thin alkaline limestone soil is the wrong site, which is a sharper constraint than most native shrubs of this type carry.

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Zone 5 to 8 per Missouri Botanical Garden makes this the least cold-hardy of the shrub dogwoods a northern gardener is likely to compare. The sibling record in this catalog puts red-osier dogwood at zone 2, and both pagoda dogwood and gray dogwood are markedly more northern plants than this one. The Kew rows agree with that reading of the plant: Ontario is the only Canadian entry in the entire native distribution, whereas the siblings reach the Maritimes and the Prairie provinces. In the upper Midwest and across most of Canada this is the wrong member of the group.

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Buy it knowing the taxonomy is unresolved, because it affects what arrives. Cornus obliqua, pale dogwood, is treated by many floras as a separate species and by Missouri Botanical Garden as Cornus amomum subsp. obliqua on a page of its own; it has narrower, less silky leaves and paler blue fruit, occupies the northern and western part of the combined range, and hybridises with typical Cornus amomum where the two meet. Bare-root conservation stock is grown from collected seed at volume and is frequently one, the other, or intermediate. For riparian restoration that hardly matters. For a garden where the blue fruit and the silky underside are the reason for the plant, buy from a nursery that names its seed source.