Rockspirea (Holodiscus dumosus)

Rockspirea

Also known as: Bush oceanspray, Rockspiraea

Rockspirea (Holodiscus dumosus) is a member of the rose family. Indigenous to the forests and shrublands of western United States and northern Mexico, it grows as a low, spreading shrub with reddish twigs and feathery flower panicles. It is aromatic and blooms in the summer.

Scientific classification

Species

Rockspirea (Holodiscus dumosus)

Roses, elms, figs, and allies

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Perennial

Lifespan

Shrub

Plant Type

Late spring, Summer

Bloom Time

30 cm to 2 m

Plant Height

1.5 m

Spread

2.5 cm

Flower Size

Summer, Fall

Growth Season

Moderate

Growth Rate

Images of Rockspirea

Attributes of Rockspirea

Growth Rate

Rockspirea's moderate growth rate during summer and fall manifests in gradual but consistent increments in height and leaf production. An observable pattern includes its lavender-colored blossoms in fall, aligning with its moderate growth speed. Interestingly, the cooler temperatures and shorter days of fall do not hinder rockspirea's growth progression.

Distribution of Rockspirea

Distribution Map

Rockspirea is primarily native to parts of North America, where it thrives within specific regions characterized by particular ecological conditions suitable for its growth. Over time, rockspirea has been observed beyond its indigenous range, indicating a flexible adaptability to a variety of habitats, yet it is not widely reported as an introduced species in many other continental regions.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Dry, rocky cliffs and hillsides

Hemisphere Trend Curve

Northern

Sorthern

Care Guide for Rockspirea

Every 3 weeks

Water

Full sun

Sunlight

0 - 32 ℃

Ideal Temperature

Water: Adapted to infrequent watering, rockspirea thrives on moderate moisture and withstands dry spells. Water every three weeks to mimic its natural habitat's rainfall. Typically grown outdoors, rockspirea flourishes with minimal irrigation, aligning its growth season with natural precipitation patterns.

Fertilize: For optimal growth, rockspirea needs seasonal fertilization with balanced nutrition in early spring and late summer. Follow product guidelines to avoid over-fertilization, which harms blooms. Adjust frequency based on rockspirea's life cycle and growth responses, ensuring fertile soil while maintaining natural hardiness.

Pruning: Rockspirea features feathery white flowers and arching branches, requiring annual pruning in late spring post-flowering to promote growth and shape. Remove dead or crossing branches and thin dense areas for better air circulation, enhancing blooms and reducing disease risks for a vibrant garden presence.

Propagation: Rockspirea, from the genus Holodiscus, thrives in rocky terrain. Successful propagation involves taking semi-hardwood cuttings during active growth, using healthy samples, and applying rooting hormone. Ensure consistent moisture and indirect sunlight while shielding cuttings from extreme temperatures for optimal growth.

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