What hardiness zones is Penstemon campanulatus suitable for?

Penstemon campanulatus is suitable for USDA hardiness zones 7, 8, 9.

What are the sun requirements for Penstemon campanulatus?

Penstemon campanulatus requires Full Sun.

How much water does Penstemon campanulatus need?

Penstemon campanulatus has Low water needs.

Perennials

Penstemon campanulatus

Bellflower Penstemon

Plantaginaceae

Mexico and Guatemala (pine-oak forests, rocky slopes, roadsides at 6000-10000 ft / 1800-3000 m); parent species of many European hybrid penstemons

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At a Glance

TypePerennial

HabitUpright

FoliageSemi-evergreen

Height18-24 inches (45-60 cm)

Width12-18 inches (30-45 cm)

Maturity2 years

Growing Zones

USDA Hardiness Zones

7 - 9

Zone 7 Zone 8 Zone 9

These zones indicate the coldest temperatures this plant can typically survive.

What's my zone? →

Frost Tolerancehardy

Key Features

Attracts Pollinators Attracts Hummingbirds Deer Resistant Drought Tolerant Container Friendly

Native to North America

Maintenancemoderate

Overview

Penstemon campanulatus is a semi-evergreen to evergreen perennial reaching 18–24 inches (45–60 cm) tall with a spread of 12–18 inches (30–45 cm) and an upright bushy habit with multiple stems rising from the base. Native to Mexico and Guatemala, this species opens narrow tubular-campanulate flowers 0.8–1 inch (2–2.5 cm) long in shades of pink, rose-purple, or lavender—flower color runs variable across seed-raised plants—in loose open racemes from June through October. Opposite narrowly lanceolate leaves run 2–4 inches (5–10 cm) long and 0.2–0.4 inches (5–10 mm) wide, medium to dark green, with finely toothed margins. Growth rate runs moderate. Hardy to zone 7. This species carries the genetic parentage of many European hybrid penstemons developed during the 19th and 20th centuries, and the species' flower morphology and cold tolerance translate into the hybrid group's characteristic traits. Mature scale runs more compact and narrower-textured than the large-flowered garden hybrids. Flower color runs variable from seed and ranges across pink and purple tones across a single seed batch.

Native Range

Penstemon campanulatus is native to Mexico and Guatemala, growing in pine-oak forests, rocky slopes, and roadside cuts at 6,000–10,000 feet (1,800–3,000 m) elevation. The high-altitude Mexican highland origin translates in garden cultivation to tolerance of summer heat combined with the cold hardiness to zone 7. The species runs a key parent in the genetic background of the European hybrid penstemons.

Suggested Uses

Planted in rock gardens, gravel gardens, or perennial borders at 12–18 inch (30–45 cm) spacing in zone-7-and-warmer gardens. Narrower-textured habit combined with smaller flowers runs more natural-looking than the large-flowered European hybrids, which fits the species to naturalistic and native-adjacent planting designs. Flower color variability across seed-raised plants supplies genetic diversity in mass plantings at the cost of color uniformity. Self-seeding maintains colony presence across the species' short 3-to-5-year individual plant lifespan. Sharp drainage is essential. Wet soils and heavy clay are poor fits for the species.

How to Identify

Separated from the large-flowered European hybrids ('Blackbird', 'Blue Midnight') by the smaller flowers (0.8–1 inch versus 1–1.5 inches on the hybrids), by the narrower leaves, and by the more open raceme structure. Separated from 'Catherine de la Mare' by the taller mature stature (18–24 inches versus 10–15 inches for 'Catherine de la Mare'). Separated from P. digitalis by the narrower campanulate flower shape (versus the wider open-throated flowers of P. digitalis) and by the shorter stature. A narrow-textured species penstemon with narrow pink-purple campanulate flowers and lanceolate leaves identifies the species.

Appearance

Size & Dimensions

Height1'6" - 2'

Width/Spread1' - 1'6"

Reaches mature size in approximately 2 years

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~14 weeks

Summer Fall

Loose open racemes of tubular-campanulate flowers 0.8–1 inch (2–2.5 cm) long open from June through October in pink to rose-purple or lavender coloration. Flower color runs variable across seed-raised plants, so individual garden colonies may trend toward one color range depending on parental genetics. Fresh bloom duration runs 12–16 weeks with regular deadheading.

Detailed Descriptions

Flower Description

Pink to rose-purple or lavender (variable in seed-raised plants); narrow tubular-campanulate 0.8-1 inch; loose racemes; June-October

Foliage Description

Medium to dark green; narrowly lanceolate 2-4 inches × 0.2-0.4 inch; finely toothed margins; opposite arrangement

Growing Conditions

Sun Requirements

Full Sun

Requires 6-10 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range6.0 - 7.5(Neutral)

357912

Soil Types

sand loam chalk rocky

Drainagewell drained

Water & Climate

Water Needs

Low

Frost Tolerance

hardy

Time to Maturity

1 year

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Full sun in well-drained lean soil (pH 6.0–7.5) matches the species' cultivation needs. Hardy to zone 7 (0°F / −18°C). Sharp drainage is essential because wet soil conditions cause crown rot during the winter months. The species tolerates poor rocky soils that defeat many garden perennials. Heat and drought tolerance runs higher than the European hybrid penstemons, which reflects the species' Mexican highland native origin. Tree lifespan runs short at 3–5 years, but the species self-seeds in favorable garden conditions and maintains colony presence through seedling recruitment.

Pruning

Deadheading runs through the bloom window to extend flowering and to prevent excessive self-seeding where volunteer seedlings are not wanted. Cutback of roughly one-third occurs in early spring to maintain compact habit. Semi-evergreen foliage persists across mild winters in zone-7-and-warmer positions.

Pruning Schedule

early spring