Firecracker Penstemon
Penstemon eatonii
A vivid Southwestern native that lights up late winter gardens with scarlet spikes hummingbirds cannot resist.
Hardy in USDA zones 4-10; a cold-hardy evergreen rosette in the low desert that blooms in late winter and tolerates both low- and higher-desert elevations.
AMWUA Notes
A very low-water native that delivers vivid off-season hummingbird color and reseeds itself for a self-renewing display.
Care Guide
Water every 2-3 weeks during the cool bloom season and monthly or less in summer; the basal rosette needs dry summer conditions and sharp drainage to persist.
Cut spent flower stalks to the base after bloom to tidy the rosette and encourage reseeding; leave a few stalks if you want volunteers.
None needed — lean, unamended desert soil is ideal.
No serious pests; the main cause of loss is overwatering in summer heat.
A low evergreen rosette that sends up scarlet spikes in late winter and spring, then rests in summer; reseeds readily to renew short-lived plants.
Soil, Feeding & Propagation
Lean, gravelly, fast-draining desert soils; thrives in decomposed granite and rocky ground; needs dry summer soil.
Needs sharp, fast-draining soil.
None — thrives in lean desert soil without fertilizer.
Seed; reseeds readily to replace short-lived crowns. Divides and transplants poorly.
1.5 ft
Short-lived rosette with a fibrous crown; renews by reseeding. Summer overwatering, not root spread, is the concern.
Placement Tips
- •Mass the flower spikes in drifts so the late-winter scarlet reads as a bold sweep against dormant beds.
- •Plant among boulders and gravel where the low rosettes stay dry between rains.
- •Let it reseed freely — expect volunteers to replace older crowns over a few years.
- •Site in full sun with reflected heat; it needs no afternoon shade even in hot spots.
Features
Best Uses
Ecological Value
Attracts
Wildlife Value
Companion Plants
Quick Stats
Design Styles
Include in Your Project
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Use this care guide to maintain your Firecracker Penstemon. Questions about your landscape? Reach out anytime.
Data from 2024 AMWUA “Landscape Plants for the Arizona Desert” guide.
Firecracker Penstemon — common questions
Answers for low-desert Phoenix conditions, drawn from this plant’s growing data.
How much water does Firecracker Penstemon need in Phoenix?
Firecracker Penstemon is a low-water perennial once established. Water every 2-3 weeks during the cool bloom season and monthly or less in summer; the basal rosette needs dry summer conditions and sharp drainage to persist. A very low-water native that delivers vivid off-season hummingbird color and reseeds itself for a self-renewing display.
How big does Firecracker Penstemon get?
Expect roughly 1 ft tall and 1.5 ft wide at maturity, with a moderate growth rate. Allow about 1.5 ft of spacing when planting. Short-lived rosette with a fibrous crown; renews by reseeding. Summer overwatering, not root spread, is the concern.
Can you plant Firecracker Penstemon near a pool?
Yes. Firecracker Penstemon is considered pool-friendly, meaning it stays clean enough around water features and hardscape. Litter is rated low.
Can Firecracker Penstemon handle Arizona heat and winter frost?
Firecracker Penstemon is hardy in USDA 9-11 and wants full sun. Hardy in USDA zones 4-10; a cold-hardy evergreen rosette in the low desert that blooms in late winter and tolerates both low- and higher-desert elevations. A low evergreen rosette that sends up scarlet spikes in late winter and spring, then rests in summer; reseeds readily to renew short-lived plants.
Does Firecracker Penstemon have thorns?
No. Firecracker Penstemon is thornless, so it is safe alongside walkways, patios and play areas.
Is Firecracker Penstemon safe around pets?
Firecracker Penstemon is listed as pet-friendly in this guide. If your dog is a determined chewer, check any new plant with your vet before planting.
When does Firecracker Penstemon bloom in Arizona?
Firecracker Penstemon blooms in late winter-spring, with scarlet flowers. The bloom draws bees, butterflies, hummingbirds.
How much maintenance does Firecracker Penstemon need?
Firecracker Penstemon is low-maintenance. Leaf, flower and pod litter is rated low. Cut spent flower stalks to the base after bloom to tidy the rosette and encourage reseeding; leave a few stalks if you want volunteers.
What kind of soil does Firecracker Penstemon need?
Lean, gravelly, fast-draining desert soils; thrives in decomposed granite and rocky ground; needs dry summer soil. It needs no supplemental feeding. None needed — lean, unamended desert soil is ideal.
Is Firecracker Penstemon native to Arizona?
Yes. Firecracker Penstemon is native to Arizona and to the Southwestern US, Northern Mexico, so it is adapted to local rainfall, soil and heat.