Pacific Ninebark plant profile
Physocarpus capitatus
A perennial shrub for full sun.
Last updated .
When to plant
When to plant Pacific Ninebark
Plant this shrub while dormant, in fall or early spring. Extension guidance rates fall (early enough for roots to establish before the ground freezes) as the best time and spring, just before growth begins, as the next best.
The calendar shows this cited seasonal window as an approximate band. It does not convert the season into frost-adjusted dates.
Open Pacific Ninebark in my garden calendarShows the source-backed planting season, not frost-adjusted dates.
Growing conditions
- Sun
- Full sun
- Soil pH
- 5 to 6
- Lifecycle
- Perennial
Common problems
Watch for these
Also watch for: open straggly habit, needs consistent moisture.
Next steps
Continue with Pacific Ninebark
Evidence trail
Evidence behind this profile
Original extension and institutional publications behind the planting, care, and safety facts on this page.
- Physocarpus capitatus (Pacific Ninebark / Western Ninebark)
OSU Landscape Plants (Oregon State University Department of Horticulture). Supports general reference. Checked 2026-06-18.
- Planting Shrubs Correctly (HGIC 1052)
Clemson Cooperative Extension, Home & Garden Information Center. Supports planting reference. Checked 2026-06-18.