Rocky Mountain Penstemon plant profile
Penstemon strictus
A perennial flower for full sun.
Last updated .
When to plant
When to plant Rocky Mountain Penstemon
Rocky Mountain penstemon is a long-lived perennial that blooms in mid to late spring; Colorado State recommends a full-sun spot with lean, well-draining soil and notes it self-seeds and needs only deep, infrequent watering once established. No explicit planting date is given, so a spring band is approximate.
The calendar shows this cited seasonal window as an approximate band. It does not convert the season into frost-adjusted dates.
Open Rocky Mountain Penstemon in my garden calendarShows the source-backed planting season, not frost-adjusted dates.
Growing conditions
- Sun
- Full sun
- Lifecycle
- Perennial
Common problems
Watch for these
Also watch for: overwatering, rich soil flopping.
Next steps
Continue with Rocky Mountain Penstemon
Evidence trail
Evidence behind this profile
Original extension and institutional publications behind the planting, care, and safety facts on this page.
- Easy to Love: Rocky Mountain Penstemon
Colorado State University Extension, Pueblo County. Supports general reference. Checked 2026-06-18.