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Rock Penstemon (Penstemon baccharifolius), whole plant
  • Rock Penstemon — close-up of leaves and flowers
  • Rock Penstemon — seasonal appearance
  • Rock Penstemon in a garden setting

Rock Penstemon

Penstemon baccharifolius

Easy · Beginner friendly

About Rock Penstemon

Rock Penstemon, also called Cutleaf Beardtongue, is a striking evergreen perennial native to the rocky limestone hills of west Texas, the Edwards Plateau, and northern Mexico. Growing 1 to 2 feet tall with leathery toothed gray-green leaves, it bears spires of vivid coral-red to scarlet tubular flowers from late spring through fall. A magnet for hummingbirds and one of the most heat-tolerant penstemons, perfect for the harshest Southwest garden sites.

  • Drought-tolerant
  • Evergreen
  • Long-blooming
  • Native
WATER
Regular
Top inch dry
LIGHT
Full sun
6+ hrs direct
HARDY
Hardy to 0°F (-18°C)
USDA hardiness zones 7–9

How to care for Rock Penstemon

Watering

  • Springevery 10 days
  • Summerevery 7 days
  • Fallevery 14 days
  • Winterevery 21 days

Soil · Well-draining

  • Top dressingPine bark mulch10%
  • Main mixPotting soil + perlite 2:170%
  • DrainageLECA / gravel20%

Never skip the drainage layer — standing water is the top cause of root rot.

FERTILIZER

  • Springevery 60 days
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At a Glance

  • NativeNorth America
  • Height1–2 ft (0.3–0.6 m)
  • Spread1–2 ft (0.3–0.6 m)
  • Flower colorRed, Pink
  • Foliage colorGreen
  • SoilSandy, Well-drained
  • LocationsYard · Balcony

Bloom time

BLOOM CYCLE

Peak bloom

May–Oct

J
F
M
A
M
J
J
A
S
O
N
D

Coral-red tubular flower spires May to October

Toxicity

Toxicity unknown

None reported

Unknown

EXPOSURE Unspecified plant material.

EFFECT Toxic effects are not specified.

NOTE Toxicity for humans is not well documented; use caution until verified.

Unknown

EXPOSURE Unspecified plant material.

EFFECT Toxic effects are not specified.

NOTE Toxicity for dogs is not well documented; use caution until verified.

Unknown

EXPOSURE Unspecified plant material.

EFFECT Toxic effects are not specified.

NOTE Toxicity for cats is not well documented; use caution until verified.

Educational information, not medical or veterinary advice. If exposure is suspected, contact a doctor or veterinarian.

DISTRIBUTION

Rock Penstemon · Native
  • Native
  • North America

History

Illustrated historical scene for Rock Penstemon

Penstemon baccharifolius, commonly called rock penstemon or cutleaf penstemon, is a small woody-based perennial native to limestone ledges, rocky slopes, and dry canyons of central and west Texas, New Mexico, and adjacent Mexico. American botanist Wilhelm Hooker described the species in 1840, the epithet baccharifolius referring to foliage resembling that of Baccharis. The plant produces bright rose-red to cherry-red two-lipped tubular flowers from late spring through fall atop stiff stems 30 to 60 centimeters tall, a color and bloom length unusual among native penstemons.

The Lady Bird Johnson Wildflower Center and Texas A&M Earth-Kind program have championed the species for Edwards Plateau xeriscape and alpine rock gardens, where its heat tolerance, cold hardiness, and hummingbird appeal shine. A signature plant of west Texas limestone canyons and the Edwards Plateau, Rock Penstemon has become a staple of Texas-Friendly Landscaping programs and the Lady Bird Johnson Wildflower Center recommendations.

Provides exceptionally long-season hummingbird forage in the harshest garden conditions.

Symbolism & meaning

What It Symbolizes

Rock Penstemon is wild fire in the limestone cliffs of West Texas, its blazing coral spikes throwing color against pale rock through a long, baking summer. Hummingbirds keep faithful, devoted watch on its flowers, returning to fuel up across the entire warm season. In its narrow, intense bloom lies a small crucible of desert heat made visible.

  • Wild fire — blazing coral spikes of west Texas limestone country
  • Hummingbird devotion — long-season fuel for ruby-throated hummingbirds

Where the Name Comes From

'Penstemon' from Greek for 'five stamens'; 'baccharifolius' means with leaves like Baccharis (groundsel tree).

Uses & Fun Facts

  • Coral-red tubular flowers magnetize hummingbirds in arid gardens
  • Evergreen Texas native for rocky xeriscape and limestone beds
  • Long-blooming Hill Country native supports Southwest pollinator strips

Related plants

More Penstemon plants

Plants with similar care

Frequently asked questions

How often should I water Rock Penstemon?

In summer, water about every 7 days; in winter, about every 21 days. Adjust for heat, pot size and drainage.

How much light does Rock Penstemon need?

Full sun: 6+ hrs direct. Watch the leaves — scorching or stretching means the light needs adjusting.

Is Rock Penstemon toxic to cats or dogs?

Pets Unknown (Dogs Unknown · Cats Unknown) Educational information, not medical or veterinary advice. If exposure is suspected, contact a doctor or veterinarian.

Is Rock Penstemon easy to grow?

Yes — it is considered an easy, beginner-friendly plant.

When does Rock Penstemon bloom?

It typically blooms May–Oct in the Northern Hemisphere.

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