Bristly blackberry

Photo: Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 2: 279. Provided by Kentucky Native Plant Society. Scanned by Omnitek Inc. — Public domain · source

Survives zone 3 through 7

Harvest calendar

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

Lives up to its name: 150 to 1,200 bristles per square inch on the canes, among the prickliest brambles going. More a wetland-margin plant than the drier thickets most Rubus here favour.

Hardiness

Zone 3–7

Habit

Shrub

Edible part

Fruit

Ripens

June–July

Mature size

Upright to arching canes, likely 1–2 m based on the genus; no verified figure found for this species

Light

Full sun to part shade

Soil pH

5.0–6.5 (acid) — a wetland-margin species

Environment

Temperate, wetland-associated

Native range

Quebec west to Minnesota, south to Virginia and Illinois — thickets, forest edges, marshes and wetland margins.

Status

Wild

Years to fruit

2 yrs

Growth speed

Fast — canes make 1–3 m in a season

Spacing

150 cm (59 in) apart — about 2.3 m² (24 sq ft) per plant

Leaf shape

Compound, 3 or more leaflets, 6–14 cm, toothed margins

Root system

A perennial crown and shallow spreading root system in the top 30–40 cm, carrying biennial canes: each cane grows one year, fruits the next, then dies. New shoots come from buds on both the crown and the roots, which is why a bramble returns from root fragments left after digging and why it is so hard to remove once settled.

Fruit description

Black aggregate berry roughly 1–1.5 cm, ripening midsummer on bristly canes — sweet-tart and pleasant but small and seedy, and produced sparingly compared with a cultivated blackberry. Worth foraging, not worth planting for a crop.

Propagation

Tip layering is the natural method for the trailing kinds: bury a cane tip in late summer and sever it once rooted. Erect kinds sucker freely and a rooted sucker can simply be lifted. Root cuttings in winter also work. Seed needs a long cold stratification and is slow.

Pollination

Self-fertile and bee-pollinated, and facultatively apomictic — much of the seed is produced without fertilisation, so seedlings often come near-true to the parent. That apomixis is why this group is described as hundreds of near-identical microspecies rather than a handful of variable ones.

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.