How to Grow Scarlet Bugler Penstemon

Scarlet Bugler Penstemon

Penstemon coccineus

flower

Penstemon coccineus is a striking wildflower native to the southwestern United States, prized for its vibrant scarlet-red tubular flowers that bloom in dense spikes. This short-lived perennial typically grows 12-24 inches tall and attracts hummingbirds and bees with its nectar-rich blooms. It thrives in dry, well-drained conditions and is ideal for rock gardens, native plant landscapes, and pollinator gardens.

Growing Conditions

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Sun: Full sun, 6-8 hours daily; tolerates afternoon shade in hot climates

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Water: Low to moderate water needs; drought-tolerant once established. Water during establishment and drought periods. Avoid overwatering, especially in winter, as this causes root rot.

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Spacing: 12-18 inches

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Days to maturity: 60-90 days from seed to flowering

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Planting depth: Surface sow seeds with light cover of soil; seeds need cold stratification (30 days of moist chilling); transplants at soil line

Soil

Type: Well-draining sandy or gravelly soil; tolerates poor soil

pH: 6.0-7.5

Amendments:

Perlite or coarse sand for drainage Gravel mulch to prevent root rot Minimal compost needed

Growing Zones

Find your zone →

Thrives in zones 4-9; best performance in zones 5-8

4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b

Growth Stages

Seedling

3-4 weeks

Tiny seedlings with two cotyledons emerge after 2-3 weeks cold stratification. First true leaves are narrow and lance-shaped.

Keep soil lightly moist but never waterlogged. Provide bright light. Maintain cool temperatures (50-65°F) for germination.

Vegetative Growth

6-8 weeks

Plant develops a rosette of narrow, linear gray-green leaves. Growth is slow but steady. Plant becomes stocky and compact.

Reduce watering frequency. Ensure excellent drainage. Do not fertilize heavily; low-nutrient soil is ideal. Light frost exposure helps harden plants.

Budding & Pre-Flowering

2-3 weeks

Flower spike begins to emerge from the center of the rosette. Dense cluster of small green buds appears at the top of a sturdy stem.

Maintain consistent (but not wet) soil moisture. Provide full sun exposure. Do not fertilize. Support tall varieties if needed in windy locations.

Flowering

4-6 weeks

Brilliant scarlet-red tubular flowers open sequentially along the spike from bottom to top. Blooms attract hummingbirds and native bees. Plant may reach 12-24 inches tall.

Deadhead spent flowers to encourage continued blooming. Avoid overhead watering that wets foliage. Water at soil level only.

Seed Formation & Decline

3-4 weeks

Flowers fade and seed pods develop along the spike. Plant energy shifts to seed production. Foliage may decline after flowering.

Leave seed heads in place if collecting seeds. Stop watering if plant shows decline. Allow natural senescence to occur. Collect seeds when pods brown and dry.

Companion Planting

Plan your garden →

Plant with:

Blanket Flower (Gaillardia) Desert Marigold Catmint (Nepeta) Russian Sage (Perovskia) Sedums Thyme Buckwheat Sulfur Flower (Eriogonum) Phlox Black-eyed Susan (Rudbeckia)

Avoid planting near:

Heavy feeders like tomatoes Plants requiring frequent watering (Hostas, Ferns) Dense shade plants Moisture-loving perennials (Astilbe, Primrose)

Common Pests

Spray with strong water jet; use insecticidal soap if severe. Encourage natural predators like ladybugs.
Increase humidity by misting; apply neem oil if infestation occurs. Rarely problematic in well-ventilated gardens.
Ensure excellent drainage; do not overwater. Remove affected plants. Use well-draining soil mix with perlite.

Uses

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Hummingbird & Pollinator Magnet

Wildlife

The tubular scarlet flowers are irresistible to hummingbirds and native bees. Penstemon coccineus is a critical nectar source in southwestern ecosystems and supports pollinator populations in xeriscapes. [source]

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Edible Flowers

Culinary

The nectar-rich flowers can be harvested and used to flavor drinks or as a garnish for desserts and salads. The flavor is subtly sweet with floral notes. [source]

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Cut Flowers & Arrangements

Household

Scarlet spikes make dramatic additions to fresh floral arrangements and dried arrangements. Cut stems just as lower flowers open for longest vase life. [source]

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Traditional Native American Uses

Medicinal

Southwestern tribes traditionally used Penstemon species for respiratory support and general wellness. Modern herbalists research penstemon for potential antioxidant compounds. [source]

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Xeriscaping & Native Landscaping

Craft

Drought-tolerant and low-maintenance, Penstemon coccineus is essential for water-wise gardens, rock gardens, and native plant restoration projects in arid and semi-arid regions. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Penstemon coccineus is ornamental; harvest flowers for cut arrangements by cutting stems just as flowers open. Collect seeds in late summer by cutting dried seed pods into a paper bag when they turn brown and dry. Allow pods to dry further indoors, then extract seeds for next season's planting.

Fun Facts

🌱 Penstemon coccineus is the state flower of Nevada, where it thrives in high desert conditions and volcanic soils.
🌱 The name 'Penstemon' comes from Greek words meaning 'five' and 'stamen'; the flower has five stamens, with one being sterile and stamen-like (called a staminode).
🌱 Unlike many short-lived perennials, Penstemon coccineus readily self-seeds in ideal conditions, creating naturalized drifts in gardens that mimic its native southwestern habitat.

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