Royal penstemon (Penstemon speciosus)

Royal penstemon

The light-blue and lavender flowers of royal penstemon make this beautiful perennial a noteworthy garden ornamental. This wildflower of the western United States occurs in a wide range of habitats, but as a garden plant, it likes sunny sites and well-drained soil. It is also a good flower for attracting butterflies and various types of insects.

Scientific classification

Species

Royal penstemon (Penstemon speciosus)

Mints plantains olives and allies

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Perennial

Lifespan

Herb

Plant Type

Summer, Early fall

Bloom Time

15 cm to 76 cm

Plant Height

30 cm

Spread

Green

Leaf Color

2.5 cm to 5 cm

Flower Size

Spring, Summer

Growth Season

Moderate

Growth Rate

Images of Royal penstemon

Attributes of Royal penstemon

Growth Rate

The moderate growth rate of royal penstemon is pronounced during Spring and Summer, influencing steady increases in stem height, foliage production, and bud development. Observers may notice a heightened production of the plant's distinct tube-shaped flowers during these periods. This pace also allows royal penstemon adequate time to develop strong, resilient structures, crucial for horticultural robustness. Minor seasonal variations may exist, yet predominantly this rate holds.

Care Guide for Royal penstemon

Every week

Water

Full sun

Sunlight

0 - 32 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Adapted to arid climates, royal penstemon conserves water and prefers drier conditions. It requires infrequent watering, ideally once a week, promoting optimal growth. As an outdoor plant in rocky terrains, royal penstemon efficiently stores water, sustaining blooms during scarce rainfall.

Fertilize: For royal penstemon, apply a balanced fertilizer monthly during active growth, and use high phosphorus fertilizers every 8-10 weeks in bloom. Follow label instructions to prevent over-fertilization, adjust for dormancy, and handle seedlings gently, enhancing growth and resilience in varying habitats.

Pruning: Royal penstemon thrives with vibrant flowers and dense foliage. Prune in early spring or late winter by removing dead stems and shaping for new growth. This enhances air circulation, reduces disease risk, and promotes fullness. Use clean tools and avoid heavy pruning during blooming for optimal display.

Propagation: Royal penstemon can be propagated through cuttings by selecting a healthy stem segment with leaf nodes. Use a clean tool, remove lower leaves, and apply rooting hormone. Plant in well-draining soil, maintain moisture, and provide indirect light until roots establish and new growth occurs.

Repotting: Royal penstemon requires excellent drainage in pots to thrive, ensuring that water does not accumulate, which could lead to root rot. Proper drainage is essential for healthy growth and longevity of the plant.

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