Do I need both male and female plants?

Yes, because the species is dioecious, you need both to ensure fruit production.

How do I control its spread?

Prune back the trailing runners in late winter to keep it within your desired boundaries.

Plant guide

California blackberry.

Rubus ursinus

Pronounced ROO-bus ur-SY-nus

Also known as California blackberry, California dewberry, Douglas-berry, Pacific blackberry, Pacific dewberry, Pacific trailing blackberry

The California blackberry is a lovely native bramble that produces delicious, sweet fruit. It is a trailing plant that loves to scramble over fences or through open spaces in your garden. You will find it is quite hardy and brings a nice touch of the wild to your landscape.

At a glance

Care level: Easy
Plant type: Deciduous shrub
Light: Full sun to partial shade
Indoor light: Bright indirect
Water: Every 5 to 10 days
Mature size: 3 to 10 feet
Growth rate: Fast
Hardiness: USDA 7 to 10
Bloom time: Late spring to early summer

Care

Give this plant plenty of room to spread or provide a sturdy trellis for it to climb. Keep an eye out for dry, brittle stems that need clearing and watch for signs of pests like aphids. It is a vigorous grower, so keep your shears handy to maintain its shape.

Watering: Keep the soil consistently moist but not waterlogged during the growing season.
Feeding: Apply a balanced fertilizer during the spring and early summer months.
Pruning: Prune back old canes after the harvest to encourage new growth for next year.
Repotting: Repot only if the plant becomes rootbound in a container, though it prefers being in the ground.
Soil: Well-draining, loamy soil
Soil pH: 6.0 to 7.0
Temperature: -15 to 35°C
Humidity: 40 to 70%

Safety

People: The plant is not toxic, but the stems are covered in sharp prickles that can cause skin irritation.
Children: Keep children away from the thorny stems to avoid scratches and potential infection.
Contact allergens: The sharp prickles can cause mechanical skin irritation or scratches.
Airborne allergens: Pollen may cause mild reactions in sensitive individuals during the flowering season.
Edibility: Ensure you properly identify the plant before consuming, as some lookalikes may be inedible.

How to identify it

Trailing or climbing woody stems
Prickly stems with small thorns
Leaves with three to five leaflets
White flowers with five petals
Dark purple to black edible berries

Height: 0.3 to 1m
Spread: 1 to 3m
Leaves: green, semi-evergreen
Flowers: white, 2 to 4cm
Fruit: black, Summer

Problems to watch for

Rust · Fungal infection causing orange or yellow spots on leaves.
Aphids · Small insects that suck sap from new growth.

By symptom

Plant problems by symptom

Check your california blackberry from a photo

Pocket Botanist looks at a photo of your plant and tells you what's wrong and what to try first.

Growing it

Propagation: cuttings, division, seed
When to plant: fall, spring

Plant in a dedicated patch to allow for easy harvesting and to prevent the thorny vines from overtaking other garden beds.

Grows well with

Sword Fern · They share similar woodland edge habitat requirements.
Salal · It provides a nice evergreen backdrop for the trailing blackberry vines.

Similar species

Himalayan Blackberry · This is an invasive species that is much larger and more aggressive than the native variety.

Science

Family: Rosaceae
Genus: Rubus
Order: Rosales
Class: Magnoliopsida
Native range: Western North America, from British Columbia to California.
Conservation: It is widespread and not of conservation concern.

It thrives in forest clearings and disturbed areas, often acting as a pioneer species after fires.

Value to wildlife: nectar source, nesting habitat, food source for birds
Pollinators: bees, butterflies, beetles
Uses: culinary fruit, wildlife habitat, ground cover

Through the year

JFMAMJJASOND

Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 5/9
Light: 6/9
Temperature: 5/9
Moisture: 5/9
Nutrients: 5/9

Taxonomy resolved against GBIF.

Questions people ask

Do I need both male and female plants?: Yes, because the species is dioecious, you need both to ensure fruit production.
How do I control its spread?: Prune back the trailing runners in late winter to keep it within your desired boundaries.

Where the name comes from

The specific epithet ursinus means bear-like, likely referring to the plant's rugged nature or its popularity with bears.

Good to know

The berries are considered by many to have the best flavor of all wild blackberries.
It is dioecious, meaning male and female flowers grow on separate plants.
The trailing vines can root wherever they touch the soil.
It is a primary food source for many native birds.

Keep your california blackberry growing

This page is a general guide. Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked.

Get the app

This guide was generated with AI on October 19, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.