Large beardtongue (Penstemon grandiflorus)

Large beardtongue

Also known as: Large-Flowered Penstemon, Beardtongue penstemon, Large penstemon, Shell leaf penstemon

The perennial large beardtongue (Penstemon grandiflorus) is endangered in some parts of the United States, so it rarely gets seen in the wild. It blooms in late spring with large, tubular pink or purple flowers. It is drought-tolerant and attracts bumblebees and hummingbirds.

Scientific classification

Species

Large beardtongue (Penstemon grandiflorus)

Mints plantains olives and allies

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Perennial

Lifespan

Herb

Plant Type

Spring, Summer

Bloom Time

40 cm to 1.2 m

Plant Height

30 cm to 60 cm

Spread

Green, Blue

Leaf Color

2.5 cm

Flower Size

Images of Large beardtongue

Care Guide for Large beardtongue

Every week

Water

Full sun

Sunlight

0 - 35 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Large beardtongue thrives in moderate moisture environments and prefers consistent hydration, requiring weekly watering. As a drought-tolerant herbaceous perennial, it flourishes outdoors, benefiting from seasonal rains that promote growth during its active growing season.

Fertilize: Fertilizing large beardtongue with balanced fertilizer in spring encourages growth and blooms. Monthly high phosphorus applications during active growth enhance flowering. Follow label guidelines, applying less than recommended to prevent over-fertilization. Dilute to half strength, avoiding foliage contact, and adjust application frequency seasonally.

Pruning: Large beardtongue thrives with strategic pruning in early to late spring, removing dead stems for new blooms. Pinching young shoots encourages bushy growth, while post-flowering cuts maintain shape. Regular pruning enhances air circulation, reduces disease risk, and promotes a vibrant garden display.

Propagation: Large beardtongue is a striking perennial with large tubular flowers and clumping foliage. Propagate by carefully dividing the clump, ensuring sections have growth buds. Requires well-draining, fertile soil and consistent initial moisture; established plants show drought tolerance.

Repotting: Large beardtongue requires excellent drainage in pots to thrive, ensuring healthy root development and preventing waterlogging. Proper pot selection and soil composition are essential for optimal growth.

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