Camassia cusickii

A magnificent North American native, Camassia cusickii produces elegant spires of star-shaped, soft lavender-blue flowers that rise gracefully above clumps of strap-like green foliage in late spring and early summer.

Named after the American botanist William Cusick, this impressive species is one of the tallest and most striking Camassias. Each flower spike can carry dozens of blooms, opening gradually from the bottom upwards to provide a long-lasting display. The delicate blue flowers seem to shimmer in the sunlight, creating a naturalistic and airy effect in borders, meadows and damp grassland plantings.

Native to the moist mountain meadows of the north-western United States, Camassia cusickii thrives in fertile soils and is particularly valuable for bringing colour to areas that remain moist during spring. It combines beautifully with ornamental grasses, alliums, irises and other late spring perennials.

Highly attractive to bees and other pollinating insects, this long-lived bulb will slowly form impressive clumps over time, becoming more spectacular with each passing year.

A wonderful choice for naturalistic planting schemes, cottage gardens and wildlife-friendly borders.

Planting Instructions

When to Plant:

Plant Camassia bulbs in autumn, ideally between September and November, while the soil is still warm and workable.

Where to Plant:
Choose a position in full sun or partial shade with fertile, moisture-retentive but well-drained soil. Camassias thrive in borders, wildflower meadows and areas that remain moist during spring.

How to Plant:

• Depth: Plant bulbs approximately 10–15 cm (4–6 inches) deep.
• Spacing: Space bulbs about 15–20 cm (6–8 inches) apart.
• Soil Prep: Incorporate compost or well-rotted organic matter before planting to improve soil fertility and moisture retention.

Watering:
Water after planting and during prolonged dry spells in spring. Camassias appreciate moisture while actively growing.

Aftercare Tips:

• Allow foliage to die back naturally after flowering.
• A mulch of compost in autumn will help maintain healthy growth.
• Established clumps can be left undisturbed for many years.

Top Tip:
Plant in generous groups for the most impressive display, where the tall flower spikes can sway naturally among grasses and perennials.

Plant Details

Flowering Period:
May – June (depending on season and conditions)

Height:
24–36" (60–90cm) (approx.)

Position:
Full sun or partial shade

Hardy Perennial