Species

4 other cultivars

perennial

Thorn Penstemon

Penstemon x gloxinioides 'Thorn'

The Story

Plant Bio

Penstemon are North American natives known for their tubular flowers that are highly attractive to hummingbirds and other pollinators. They typically require well-drained soil and full sun.

'Thorn' is a gloxinia-flowered penstemon featuring large, tubular, bright pink flowers with white throats. It is a relatively compact and long-blooming cultivar.

Uses & Benefits:

Thorn Penstemon provides striking purple flowers that attract pollinators, enhancing garden visual appeal.

Drought-tolerant and low-maintenance, ideal for water-wise gardening.

Supports bees, butterflies, and hummingbirds, promoting local biodiversity.

Essentials

At a Glance

Plant Type

Perennial

Height

24 inches

Width

18 inches

Light

Full Sun, Partial Sun

Zones

6, 7, 8, 9

Water

Low to moderate

Humidity

Prefers dry to moderate humidity

Lifespan

Short-lived perennial

Native To

Hybrid of North American species

Toxicity

Non-toxic to humans and pets

Bloom period

Early summer – Late summer

In flower about 3 months of the year

Planting

How to Grow

Tuck seeds into well-draining soil in early spring for best germination.
Mist cuttings regularly to maintain humidity and encourage root growth.
Transplant seedlings when they are sturdy, typically after 6 weeks.
Prune lightly in late winter to promote bushier growth.
Fertilize monthly during the growing season with a balanced liquid feed.
Mulch around plants to conserve moisture and suppress weeds.

Pro Tip

Use well-draining soil and avoid overwatering to prevent root rot.

Keep It Thriving

Care Guide

Do

Water moderately, allowing soil to dry out between watering 🌱
Provide full sun for optimal flowering
Prune after flowering to encourage new growth
Apply a balanced fertilizer during the growing season
Mulch to retain soil moisture

Don't

Avoid overwatering, which can cause root rot ❌
Don’t disturb roots during flowering
Refrain from fertilizing late in the season
Avoid planting in dense, poorly-drained soil
Do not prune in late fall or winter

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Prune
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Vivid border plant with tubular purple flowersDrought-tolerant rock garden accentWildflower meadow addition

Companion Plants

Lavender Salvia Echinacea Coreopsis Gaillardia

Multiply

Propagation Methods

Good to Know

Common Questions

Thorn Penstemon questions

What zones can Thorn Penstemon grow in?

Thorn Penstemon is hardy in USDA Zones 6–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Thorn Penstemon deer resistant?

Yes — Thorn Penstemon is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Thorn Penstemon bloom?

Thorn Penstemon typically blooms in early summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Thorn Penstemon need full sun?

Thorn Penstemon does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Thorn Penstemon drought tolerant?

Yes — once established (usually after the first full season), Thorn Penstemon handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.