Broadbeard beardtongue (Penstemon angustifolius)

Also known as: Narrowleaf Penstemon, Narrow-leaved Beardtongue

This perennial herb features thick, waxy, gray-green stems that can reach a height of 61 cm. Its flowers, appearing in shades of pink and purple, are known to attract hummingbirds.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting

Attributes of Broadbeard beardtongue

Lifespan

Perennial

Plant Type

Herb, Shrub

Plant Height

0 mm to 30 cm

Spread

1 to 1.5 feet

Leaf Color

Green

Flower Size

0.5 to 1 inch

Flower Color

Blue, Purple

Images of Broadbeard beardtongue

Quickly Identify Broadbeard beardtongue

Look for slender, narrow leaves and tubular flowers that range from blue to purple. The plant typically grows erect and has a woody base. Flowers are arranged on a spike, and the plant has a characteristic beard-like structure inside the flower.

Scientific Classification of Broadbeard beardtongue

Phylum

Vascular plants

Class

Dicotyledons

Order

Lamiales

Family

Plantain

Genus

Penstemon

Species

Broadbeard beardtongue

Planting and Growing of Broadbeard beardtongue

Care Difficulty

Easy

Watering Schedule

Every 4 days

Sunlight Requirements

Full sun

Sunshine Duration

10-12 hours

Ideal Temperature

68-77℉

Soil Type

Potting Mix, Peat Mix

Soil pH

6.5-7.5

Fertilizer Type

Balanced

Pruning Season

Spring, Summer

Pruning Area

Branches, Leaves

Pruning Frequency

2 times a year

Repotting Season

Spring

Pot Type

Ceramic, Plastic

How to Water Broadbeard beardtongue?

For Penstemon angustifolius, it's vital to water thoroughly but infrequently. It prefers soil that dries out slightly between waterings, mimicking its natural arid habitat. Aim for about 250ml of water per session.

What are the symptoms of an underwatered Broadbeard beardtongue? ›

What should I do if my Broadbeard beardtongue is not getting enough water? ›

What are the symptoms of an overwatered Broadbeard beardtongue? ›

How to save an overwatered Broadbeard beardtongue? ›

What Are the Sunlight Requirements for Broadbeard beardtongue?

Sunlight Requirements: Full sun

Duration of light: 6 to 8 hours

Penstemon angustifolius ideally requires full sun exposure, which provides the necessary energy for optimal blossoming and robust health, reinforcing its resilience to pests and diseases.

What is the best light exposure for Penstemon angustifolius? ›

How to achieve optimal light for Penstemon angustifolius? ›

Benefits of ideal lighting conditions for Penstemon angustifolius? ›

What Is the Ideal Temperature Range for Broadbeard beardtongue?

Ideal Temperature: 68 ~ 77℉

The ideal temperature range for growing Penstemon angustifolius is between 68°F and 77°F. This range supports optimal photosynthesis, leading to healthy foliage and vibrant blooms.

What Soil is Best for Broadbeard beardtongue?

Soil type: Sandy soil, Loam, Sandy loam

Soil PH: 6.5 ~ 7.5

Penstemon angustifolius thrives in well-drained soils which prevent waterlogging detrimental to the plant. This characteristic helps to maintain healthy root systems, reducing the risk of root rot and promoting vigorous growth. This plant prefers soils with moderate fertility levels. Soils rich in organic matter provide essential nutrients, supporting robust blooming and maintaining the plant's innate resistance to pests and diseases. Soils with low water retention are ideal for Penstemon angustifolius. Such soils ensure excess water drains away swiftly, preventing overhydration and allowing the plant to thrive in conditions similar to its natural arid habitat.

How to Fertilize Broadbeard beardtongue?

Fertilizer type: Balanced

For Penstemon angustifolius, it's essential to apply a balanced fertilizer at a moderate rate. A 10-10-10 liquid fertilizer diluted to half strength is ideal for each application. For slow-release fertilizers, use a granular type at a rate of about 1 pound per 100 square feet once in early spring.

How to Prune Broadbeard beardtongue?

Pruning Time: Spring, Autumn

Start by sterilizing your pruning shears to prevent disease spread. In early spring, cut back any dead stems to the base to encourage new growth. Focus on thinning central branches to improve air circulation. After flowering in autumn, remove spent blooms and trim back lightly to maintain a neat shape. More About Pruning Techniques→

How to Propagate Broadbeard beardtongue plant?

Propagate Time: Late spring, Early summer

Before sowing, seeds may require stratification, which involves a period of cold treatment to simulate winter conditions. This can be done by placing seeds in a moist paper towel inside a sealed plastic bag and refrigerating them for 4 to 6 weeks.

Prepare a well-draining soil mix using a combination of sand, peat, and perlite. This ensures adequate drainage and aeration, crucial elements for seedling and cutting development. Fill seed trays or pots with this mixture before planting.

Plant seeds shallowly or place cuttings on the soil surface, ensuring proper contact with the soil. Water gently to avoid dislodging seeds or cuttings. Maintain consistent moisture without waterlogging the soil to encourage growth.

More About Propagating Techniques→

How to Repot Broadbeard beardtongue plant?

Repotting frequency: Every 2-3 years

Penstemon angustifolius should be repotted when you notice roots starting to emerge from the drainage holes of its current pot, indicating that it is beginning to become root-bound. Additionally, if the plant seems stunted or water is not being absorbed efficiently, it might be time for a new pot.

Select a pot that is slightly larger than the current one, ideally 1-2 inches in diameter larger. Ensure it has appropriate drainage holes to prevent waterlogging. A pot that is too large can retain excess moisture, potentially leading to root rot, so finding the right balance is key.

Opt for a well-draining sandy soil mix; Penstemon angustifolius thrives in conditions that mimic its natural habitat. Such soil ensures adequate aeration and prevents water from pooling around the roots, reducing the risk of fungal infections and promoting healthy root growth.