How to grow Penstemon in the UK
Penstemon
Penstemon (Penstemon) is a flower that grows well in UK gardens. Don't cut back in autumn — old growth protects crown over winter. Cut in April when new shoots show. This guide covers when and how to sow Penstemon, the soil and position it likes, watering and feeding, companion planting, and when to harvest.
Type
Flowers
Difficulty
Easy — good for beginners
Position
full sun (6+ hrs direct)
Sow
spring
Harvest
—
When to sow & grow Penstemon
Sowing and harvest window through the year (UK):
Jan | Feb | Mar | Apr Plant | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
Soil, position & care
- Soil
- Fertile, moisture-retentive but free-draining soil
- Soil pH
- 6.0–7.5
- Position
- Sun or part shade depending on species
- Sowing depth
- Plant at the same depth as the pot
- Spacing
- 30–60 cm apart
- Sowing
- Plant container-grown stock spring or autumn; divide established clumps in spring
- Growing
- Water well the first season until established; mulch in spring
- Harvest & upkeep
- Cut back faded foliage in late autumn or early spring; divide every 3–4 years
- Watch for
- Slugs and snails on new shoots; otherwise robust
Companion planting for Penstemon
No specific companion notes for this plant.
Grow Penstemon this year
Add Penstemon to your free 12-month plan and get watering & sowing reminders — no sign-up needed.
Penstemon FAQs
How much sun does Penstemon need?
Penstemon prefers full sun (6+ hrs direct).
Is Penstemon easy to grow?
Easy — good for beginners. Don't cut back in autumn — old growth protects crown over winter. Cut in April when new shoots show.