Rydberg's penstemon (Penstemon rydbergii)

Rydberg's penstemon

Also known as: Meadow penstemon

Rydberg's penstemon (Penstemon rydbergii) is a perennial in the snapdragon family. It is native to the western United States and tends to grow in wet, grassy areas. It produces clusters of flowers which are most commonly bright blue, but might also be white, pink, red, or purple.

Scientific classification

Species

Rydberg's penstemon (Penstemon rydbergii)

Mints plantains olives and allies

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Perennial

Lifespan

Herb

Plant Type

Spring, Summer

Bloom Time

20 cm to 71 cm

Plant Height

30 cm to 90 cm

Spread

Green, Blue

Leaf Color

1.1 cm to 1.5 cm

Flower Size

Purple

Flower Color

Semi-evergreen

Leaf type

Images of Rydberg's penstemon

Attributes of Rydberg's penstemon

Growth Rate

In the spring, rydberg's penstemon experiences moderate growth which kickstarts its development. This rate supports continuous yet controlled leaf production, resulting in dense foliage that's balanced with its height increment. Its growth speed in other seasons is comparatively slower; however, it's the spring onset that sets the course of its growth pattern. Notably, rydberg's penstemon doesn't flower every year, a trait that may be linked to its moderate growth rhythm, conserving energy for years with heavy flowering.

Care Guide for Rydberg's penstemon

Every week

Water

Full sun

Sunlight

5 - 35 ℃

Ideal Temperature

Water: Rydberg's penstemon is resilient, thriving with moderate moisture and drought tolerance. Weekly watering meets its needs. Primarily grown outdoors, rydberg's penstemon's growth is influenced by water availability, making effective irrigation essential for optimal development.

Fertilize: Fertilizing rydberg's penstemon involves using a phosphorus-rich solution biweekly during spring/summer, reducing to monthly in fall, and stopping in winter. Always water before application to prevent root burn. Adjust feeding based on rydberg's penstemon's life cycle for improved vigor and bloom quality.

Pruning: Rydberg's penstemon is a vibrant perennial with tubular flowers. Prune in early to late spring as new growth emerges. Remove damaged stems, thin overcrowded areas for air circulation, and deadhead post-bloom to extend flowering. Regular pruning promotes vigorous growth and maintains an attractive form.

Propagation: Rydberg's penstemon is a herbaceous perennial prized for its vibrant flowers and preference for well-draining soils. Propagate using semi-hardwood cuttings from healthy parent plants, treating cuttings with rooting hormone. Use a moist, sterile potting mix, maintain humidity, and provide indirect sunlight for successful rooting.

Repotting: Rydberg's penstemon requires excellent drainage when planted in pots to thrive effectively.

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