When to plant blackberries in Wilsonville and Canby, OR

Plant blackberry canes in Wilsonville and Canby Mar 1 – Apr 19.

Easy Plant bare-root or potted canes

Difficulty: Easy
Sun: Full sun
Spacing: 3 to 5 feet apart for upright types, 5 to 8 feet for trailing
Planting depth: Same depth as in the pot, roots covered
Frost: Hardy perennial; comes back every year
First harvest: A light crop in year two, full crops from year three

Why these dates

Wilsonville and Canby's typical last spring frost is March 16. As a hardy perennial, this crop doesn't need to wait for that date. In the west-side valleys, though, the soil usually isn't ready to work until about March 1.

West-side valleys. The Willamette Valley, Puget Sound and southern Oregon valleys. Long frost-free seasons, but soil stays cold and wet into May, so warm crops wait for warm soil, not just the last frost.

How to grow blackberries in Wilsonville and Canby

Pick a sunny spot with soil that drains well, and mix in an inch or two of compost.
Plant blackberry canes Mar 1 – Apr 19, 3 to 5 feet apart for upright types, 5 to 8 feet for trailing. Same depth as in the pot, roots covered.
Train canes on a two-wire trellis. Canes fruit in their second year; after harvest, cut the canes that fruited to the ground and tie up the new ones.
Harvest: Pick when berries turn from shiny to slightly dull black and pull off easily. Check every two or three days in season.

Key numbers

Year 3First full crop
Their second yearCanes fruit in
Less cold-hardyTrailing hardiness
Spotted wing drosophilaBiggest risk

Growing notes

What makes the difference in Northwest gardens, in plain language.

Trailing, semi-erect or upright

Trailing blackberries like Marion and Black Diamond have long, flexible canes that need a trellis, and they're known for rich flavor. They're the least cold-hardy, so they do best in mild west-side gardens. Semi-erect types like Triple Crown are thornless and vigorous with big, sweet berries. Upright and hardier types like Chester handle colder eastern and higher-elevation gardens better.

Never plant Himalayan blackberry. It's an invasive weed that already smothers roadsides and creeks across the region.

How the two-year cane cycle works

Blackberry roots live for many years, but each cane lives for only two. In its first year a cane grows long and leafy; in its second year it flowers, fruits and dies. Once you see this, pruning is simple: after harvest, cut the canes that just fruited to the ground and tie the new canes onto the trellis for next year.

With trailing types, let new canes run along the ground under the trellis during summer, then lift and tie them in late winter. This keeps them out of the way of pickers and protects them from cold.

Picking and spotted wing drosophila

Spotted wing drosophila is a small fruit fly that lays eggs inside ripening berries, unlike common fruit flies that only go after damaged fruit. Within days the berries turn soft and leaky. Pick every two or three days in season, remove overripe and damaged berries, and chill your harvest right away, which slows any larvae inside.

Ripe blackberries turn from shiny to slightly dull black and come off with almost no tug.

Common questions

When is the last frost in Wilsonville and Canby, OR?

Typically March 16. In 9 years out of 10, frost is over by April 7. These are 1991–2020 NOAA climate normals for Aurora State Airport.

Is it too late to plant blackberries in Wilsonville and Canby?

The spring planting window runs through April 19. Potted plants can still go in later if you water them faithfully through their first summer. Fall planting also works well here.

How long until I can pick blackberries?

A light crop in year two, full crops from year three. Pick when berries turn from shiny to slightly dull black and pull off easily. Check every two or three days in season.

Is Marionberry a blackberry?

Yes. Marion is a trailing blackberry variety developed in Oregon and is the region's best-known blackberry. It's thorny and needs a trellis, but its flavor is hard to beat.

Why are my blackberries mushy with tiny worms?

That's usually spotted wing drosophila, a fruit fly that lays eggs in ripe berries. Pick every two or three days, clear out any overripe fruit, and refrigerate berries right after picking.

How do I get rid of wild Himalayan blackberry?

Cut canes to the ground and dig out the root crowns, then keep pulling or cutting regrowth for a few seasons. It spreads by both roots and bird-dropped seeds, so persistent removal is the key.

Also plant in Wilsonville and Canby around the same time

Planting dates for blackberries in nearby areas

Portland, OR Mar 1 – Apr 19
Gresham, OR Mar 1 – Apr 19
Hillsboro and Beaverton, OR Mar 5 – Apr 23
Oregon City and West Linn, OR Mar 1 – Apr 19
St. Helens and Scappoose, OR Mar 1 – Apr 19
Salem, OR Mar 1 – Apr 19

Full planting calendar for Wilsonville and Canby · Blackberries in every city