shrubN. America Native

Smooth Blackberry

Rubus canadensis

The Story

Plant Bio

Rubus canadensis is a deciduous, thicket-forming shrub native to eastern North America, characterized by its nearly thornless, smooth arching canes. In late spring and summer, it produces clusters of white, five-petaled flowers that give way to edible black fruits highly valued by local wildlife.

Unlike most highbush blackberries, this species is distinguished by its exceptionally smooth stems that lack prickles, making it safe and easy to handle. The foliage is notably lustrous and dark green above, turning to a smooth, nearly hairless texture on the undersides.

Uses & Benefits:

Offers structural interest with its arching, thornless canes, lustrous dark green foliage, and clusters of white spring flowers.

Serves as an effective, thornless barrier plant or erosion-control stabilizer on slopes and woodland edges.

Provides critical nesting cover for birds, hollow stems for native bees, and abundant nectar and fruit for diverse wildlife.

Essentials

At a Glance

Plant Type

Shrub

Height

118"

Width

98"

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

Medium

Humidity

Medium

Lifespan

Perennial

Native To

North America

Toxicity

Non-toxic

Bloom period

Late spring – Summer

In flower about 4 months of the year

Planting

How to Grow

Select a planting site in full sun to partial shade with moist, rich, well-drained soil.
Dig a hole twice the width of the root ball and set the plant at the same depth it was growing in the container.
Backfill with native soil, press firmly to eliminate air pockets, and water thoroughly to settle the roots.
Apply a thick layer of organic mulch around the base to conserve moisture and suppress competing weeds.

Pro Tip

Avoid applying high-nitrogen fertilizers, which stimulate excessive, soft vegetative growth that is highly susceptible to fungal diseases like cane blight and powdery mildew.

Keep It Thriving

Care Guide

Do

Prune spent floricanes to the ground immediately after the summer harvest to encourage healthy new primocanes.
Leave several dead, hollow stems cut back to 12 to 24 inches standing through winter to provide nesting sites for native bees.
Top-dress the root zone annually with organic compost in early spring to maintain soil fertility.

Don't

Do not over-fertilize with synthetic chemical fertilizers, as this weakens the canes and invites disease.
Do not plant in poorly drained, soggy soils where Phytophthora root rot can easily develop.
Do not shear the entire plant aggressively, which destroys the natural arching habit and reduces fruit yield.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Harvest
Mulch
Pest Check
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Erosion ControlNaturalizingWildlife GardensHedgesEdible Landscapes

Companion Plants

Viburnum dentatum Sambucus canadensis Monarda fistulosa Symphyotrichum novae-angliae

Multiply

Propagation Methods

Good to Know

Common Questions

Smooth Blackberry questions

What zones can Smooth Blackberry grow in?

Smooth Blackberry is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Smooth Blackberry deer resistant?

Not reliably. Deer may browse Smooth Blackberry, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Smooth Blackberry bloom?

Smooth Blackberry typically blooms in late spring through summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Smooth Blackberry need full sun?

Smooth Blackberry does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.