Rosaceae

northern dewberry

Rubus flagellaris

northern dewberry

Photo: James H. Miller & Ted Bodner, Southern Weed Science Society, Bugwood.org — CC BY-SA 3.0 · source

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Survives zone 3 through 8

Harvest calendar

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Dec

Best planted in early spring after your last frost, or in fall before the ground freezes, depending on your climate.

Sweet-tart, blackberry-like, seedy; good fresh, small crop.

Hardiness
Zone 3–8
Habit
Groundcover
Edible part
Seed, Fruit
Ripens
June–July (earlier than blackberry)
Mature size
Trailing groundcover 20–40 cm tall, the canes running 1–3 m along the ground and tip-rooting freely
Light
Full sun
Soil pH
6.0–7.0 (near-neutral)
Environment
Temperate, dry open ground
Native range
Central and eastern North America, from the Great Plains east to the Atlantic and from southeastern Canada south to Florida and Texas — the most widespread native dewberry, typical of dry open woods, fields, roadsides and forest edges.
Status
Wild
Years to fruit
2–3 yrs
Growth speed
Fast, ground-hugging spread — trailing canes can extend several metres in a season, rooting as they go.
Spacing
90 cm (35 in) apart — about 1.2 per m² (1.1 per 10 sq ft)
Leaf shape
Compound leaves, usually with 3 (occasionally 5) coarsely toothed leaflets, on slender, prickly, trailing stems 2.4–4.6 m long, with shorter erect flowering shoots to about 1.2 m.
Root system
Fibrous, perennial crown with trailing canes that root freely at the tips, letting a single plant spread outward into a broad, low mat over a few seasons.
Fruit description
Black aggregate berry 1–1.5 cm, ripening early summer, sweet when fully black and dropping readily — smaller and seedier than a cultivated blackberry but among the better wild dewberries for eating fresh.
Propagation
Primarily by tip-layering — trailing cane tips root readily where they touch soil, producing new plants that can be dug and separated; also increases by division of rooted sections, and can be grown from seed though the species is polymorphic and somewhat apomictic so seedlings may not come true.
Pollination
Self-fertile (facultatively apomictic)

The edible parts listed above are a starting point, not a field guide. Identify a plant with certainty — ideally against a local authority — before eating any part of it, and read the full disclaimer. Spotted something wrong? Report it.

Growing guide

Fertilizing. A lean-ground pioneer of dry, open, often sandy or poor soils in the wild; needs little feeding — light compost is enough, since excess nitrogen tends to push soft, disease-prone leafy growth rather than better fruit.

How it spreads. Spreads by stolon-like trailing canes that root at the tip wherever they touch soil, forming low, mounded, expanding colonies rather than an upright thicket.

Grow journal

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About the data

Zone figures are typical published ranges — microclimate, drainage and siting shift them by a zone in either direction. Store links are found by an automated search, refreshed every six weeks. Availability is seasonal; stock and prices are not tracked.

Venlo — a reference for cold-hardy edible plants