- Partial Sun to Full Sun (At Least 5 Hours of Direct Sunlight)
- Mature Height 3 - 4 Feet
- Mature Spread 2 - 3 Feet
- Growing Zones 5 - 8
Dark Towers Beardtongue is a beautiful flowering plant developed by Dale Lindgren at the University of Nebraska. The foliage is a deep purple that doesn't fade during summer waves. This plant is known for its tall spikes of pink flowers that bloom in the late spring and early summer. Its slender flower spikes can grow up to 3 feet in height. The flowers are tubular and have five lobes, each containing a pair of small, pointed ears. The plant gets its common name from the long, hairy stamens that protrude from the flowers, resembling a beard.
Dark Towers has an upright, clump-forming growth habit and can reach heights of up to 4 feet. The dense purple foliage stays evergreen in winter. This plant is generally resistant to pests and diseases, making it a low-maintenance choice for gardeners of all abilities. It is also drought tolerant, making it a good choice for areas with dry and hot conditions.
Dark Towers Beardtongue Care
Regarding care, the Dark Towers Beardtongue is relatively easy to grow. It prefers full sun, although it can tolerate partial sun. The Dark Towers Beardtongue prefers well-drained, sandy soil with a pH range of 6.0 to 7.5 but can tolerate various soil types as long as they are well draining. During the establishment phase, water Dark Towers regularly to keep the soil evenly moist but not soggy. Once established, it is drought tolerant and does not require frequent supplemental watering. Feed this perennial in early spring with a single application of a granular, slow-release fertilizer.
Pruning is generally unnecessary, as Dark Towers has a naturally attractive and tidy growth habit. However, if the plant becomes overgrown or leggy, it can be lightly trimmed in mid-summer to encourage a fuller, more compact shape. Remove any tattered foliage in early spring to encourage new growth.
You can propagate the plant by division, which involves dividing the root ball of an established plant and planting the divisions in separate pots or areas of the garden. Pentstemon has dense roots and may require some deep digging to extract them. The best time to divide Dark Towers is late summer or early fall.
Dark Towers Beardtongue Spacing
Space Dark Towers Beardtongue about 2-3 feet apart to allow for proper air circulation and room for the plants to grow. This will help to prevent overcrowding and promote healthy growth. You can also grow it in a container with a diameter of a least 16 inches.
Dark Towers Beardtongue Information
USDA Hardiness Zones: 5 - 8 |
Plant Type: Perennials |
Light Exposure: Partial Sun to Full Sun (At Least 5 Hours of Direct Sunlight) |
Mature Height: 3 - 4 Feet |
Mature Spread: 2 - 3 Feet |
Spacing: 2 - 3 Feet |
Habit: Upright, clump |
Flower Color(s): Pink |
Flower Description: Lavender |
Bloom Period: |
Foliage Type: Herbaceous |
Foliage Color(s): Green, Purple, Red |
Foliage Description: Purple-Red |
Seasonal Interest: Summer Flowering |
Watering: Average |
Resists: Deer |
Tolerates: Drought, Salt |
Attracts: Butterflies, Hummingbirds |
Container Role: |
Uses: Borders, Containers, Mass Planting |
Features: Attracts Pollinators, Cut Flowers, Foliage Interest, Fragrant, Low Maintenance, Native to North America |
Brand: |
Common Name: Dark Towers Beardtongue |
Other Name(s): Dark Towers Beardtongue |
Scientific Name: Penstemon 'Dark Towers' |
- SKU:
- 1231008847-pc
Container Sizes
Please Note: The pictures below are to give a general representation of the different container sizes. The actual size/ages of plants are estimates and will vary based on type of plant, time of year, last pruning & many other factors.

Quart Pot
Also Known As:
Quart
Plant Age:
~ 6 months - 1 year
Plant Size:
~ 4"-8"
Pot Size:
~ 4.75"H x 4.5"W
Volume:
1.50 quarts

2.5 Quart
Also Known As:
2.5 Quart Pot
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 8"-12"
Pot Size:
~ 6.5"H x 6.5"W
Volume:
2.20-2.30 quarts

#1 Pot
Also Known As:
#1 Container
1 Gallon
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 10"-14"
Pot Size:
~ 7"H x 7.75"W
Volume:
2.26-3.73 quarts

#2 Pot
Also Known As:
#2 Container
2 Gallon
Plant Age:
~ 1.5 - 3 years old
Plant Size:
~ 12"-18"
Pot Size:
~ 9.5"H x 9.5"W
Volume:
1.19-1.76 gallons

#3 Pot
Also Known As:
#3 Container
3 Gallon
Plant Age:
~ 2 - 4 years old
Plant Size:
~ 12"-30"
Pot Size:
~9.5"H x 11"W
Volume:
2.32-2.76 gallons

#5 Pot
Also Known As:
#5 Container
5 Gallon
Plant Age:
~3-4 years old
Plant Size:
~ 20" - 60"
Pot Size:
~11" H x 10 1/2” W
Volume:
3.5 - 4 gallons

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Pre-Ordered Plants
Pre-ordered plants are scheduled to ship in Spring 2025. We carefully plan our shipping dates based on your USDA Plant Hardiness Zone to ensure optimal planting conditions upon arrival. Want it sooner/later? Reach out, and we'll try our best to accommodate.
Estimated Spring Shipping Schedule
Estimated ship week for pre-ordered plants will ship based on growing zones as shown below.
Growing Zone | Estimated Ship Week |
---|---|
Zone 10 | March 24th |
Zone 9 | March 31st |
Zone 8 | April 7th |
Zone 7 | April 14th |
Zone 6b | April 21st |
Zone 6a | April 28th |
Zone 5b | May 5th |
Zone 5a | May 12th |
Zone 4 | May 19th |
Zone 3 | May 26th |
Note: These are only estimated ship dates. Plants may ship out later depending on weather & growing conditions of the plant.
Note: Only plants indicated as pre-order will ship as shown above. All other plants and hard goods will ship as normal.
Plants Shipping Now
Plants that are currently in stock typically ship within 2-7 business days after your order is placed.