How to Grow Dark Towers Penstemon
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Dark Towers Penstemon
Penstemon × 'Dark Towers'
flowerDark Towers is a striking hybrid penstemon cultivar prized for its deep burgundy foliage and vibrant tubular flowers that range from red to purple-red. This compact perennial serves as both a foliage plant and prolific bloomer, adding dramatic color to borders and containers. It typically grows 18-24 inches tall and attracts hummingbirds and pollinators throughout the blooming season.
When should you plant Dark Towers Penstemon in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Dark Towers Penstemon timeline · Pittsburgh, PA (Zone 6b)
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Plant Dark Towers Penstemon
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Dark Towers Penstemon blooms
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Dark Towers Penstemon dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 4-8, with best performance in zones 5-7
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Get my Dark Towers Penstemon timeline →Growth Stages
Seedling
2-3 weeksTiny cotyledons emerge with narrow true leaves following. Foliage begins showing dark burgundy coloring.
Keep soil barely moist, not wet. Provide bright light. Transplant to individual pots at 2-3 true leaves.
Vegetative Growth
4-6 weeksPlant develops compact mounding form with increasing dark burgundy foliage. Stems thicken and branch. No flowers present yet.
Pinch stem tips at 6 inches to encourage bushier growth. Water moderately. Ensure excellent drainage. No fertilizer needed.
Flowering
6-10 weeksTubular red to deep purple-red flowers open progressively along spikes. Blooms attract hummingbirds. Foliage remains vibrant burgundy.
Deadhead spent flowers to extend bloom. Water at base only. Watch for powdery mildew in humid conditions; ensure good air circulation.
Post-Bloom & Winter
2-3 monthsFlowering slows as temperatures drop or heat intensifies. Foliage may intensify in color. Plant hardens off for dormancy.
Cut back stems to 6 inches in fall after frost kills foliage. Ensure drainage is excellent to prevent winter rot. Mulch lightly in zones 3-4.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Ensure good air circulation, avoid wetting foliage, remove infected leaves, apply sulfur dust if severe, thin crowded stems
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Spray with water to increase humidity, use neem oil, improve air circulation, monitor undersides of leaves
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Yellow sticky traps, insecticidal soap, encourage natural predators, remove heavily infested leaves
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Improve drainage immediately, reduce watering, repot in dry soil if in containers, remove affected portions
Uses
Hummingbird Nectar Source
CulinaryThe tubular flowers are rich in nectar and actively visited by hummingbirds and other pollinators, making it an excellent plant for wildlife gardens and attracting these beneficial visitors. [source]
Cut Flower Arrangements
CraftThe striking flower spikes and burgundy foliage make excellent long-lasting cut flowers for fresh arrangements, dried arrangements, and floral design. [source]
Ornamental Border and Container Plant
HouseholdDark Towers excels as a focal plant in perennial borders, rock gardens, containers, and drought-tolerant landscapes, providing multi-season interest with both foliage and flowers. [source]
Pollinator Garden
WildlifeA premier choice for attracting native bees, butterflies, and hummingbirds while providing a long season of nectar-rich blooms from early summer through fall. [source]
Xeriscape and Low-Water Landscaping
HouseholdOnce established, Dark Towers is extremely drought-tolerant and requires minimal water and maintenance, making it ideal for water-wise gardens and sustainable landscapes. [source]
Harvest Tips
Not typically harvested as Dark Towers is an ornamental flower. Deadhead spent blooms to encourage continuous flowering throughout the season. Cut back entire plant to 6 inches after first frost in fall. Collect seeds from dried flowers in late summer if desired for propagation.
Fun Facts
- 🌱 Dark Towers was bred by Mt. Cuba Center and is a hybrid of Penstemon digitalis and Penstemon barbatus, combining vigor with ornamental appeal.
- 🌱 The deep burgundy foliage intensifies in color during cooler weather and bright sunlight, making it a true four-season plant in many regions.
- 🌱 Penstemons are sometimes called 'beardtongue' because their stamens are covered with fine hairs, and they are among the best native plants for attracting western hummingbird species.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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