Firecracker Penstemon (Penstemon eatonii)

Firecracker Penstemon

Penstemon eatonii

Tubular red blooms ignite garden borders like festive sparks. Herbaceous perennial flowering plant; common names: Firecracker Penstemon, Eaton's Penstemon.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; thrives in bright, direct sunlight and tolerates hot, dry conditions
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Watering Water deeply but infrequently; allow the top 5–7 cm of soil to dry completely between waterings to prevent root rot
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Temperature Hardy to USDA zones 5–9; tolerates mild winter frost and high summer heat up to 38°C for short periods
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Characteristics

  • Leaf: Narrow lanceolate to linear gray-green leaves; opposite arrangement with slightly hairy texture
  • Flower: Bright scarlet tubular blooms in dense terminal spikes; nectar-rich for hummingbirds and bees
  • Stem: Erect green to reddish stems; branching near the base to form compact clumps
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Care Guide

Watering

Water every 7–10 days; increase frequency during prolonged heatwaves

Fertilization

Diluted balanced 10-10-10 feed once monthly. Skip fertilization in poor, rocky soils to maintain natural drought tolerance

Banana peel compost tea:Compost banana peels for 2–3 weeks; steep in water, dilute 1:20 for root drench to enhance flowering without causing leggy growth
Pruning
  • Deadhead spent bloom spikes regularly to encourage extended flowering through mid-summer
  • Cut back stems to basal growth in late autumn to promote dense new growth in spring
  • Thin overcrowded clumps every 2–3 years in early spring to improve airflow and reduce disease risk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: No known toxic effects in humans

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Garden Uses & Culture

Culture: Symbolizes resilience and vibrant energy in xeric landscaping

Usage: Ornamental garden plant; critical pollinator habitat for hummingbirds, bees, and butterflies