Large Camas
Taxonomy
- Kingdom: Plantae
- Clade: Angiosperms
- Clade: Monocots
- Order: Asparagales
- Family: Asparagaceae (subfamily Agavoideae; sometimes treated historically under “Liliaceae” in older texts)
- Genus: Camassia
- Species: Camassia leichtlinii
Common Names by Region
- Pacific Northwest (USA/Canada): Large camas, Great camas
- General horticulture: Large camas, Camas lily (informal), Leichtlin’s camas
- Note: “Camas lily” is a common garden label, but Camassia is not a true lily.
Description
Growth Habit
Perennial, bulb-forming spring wildflower that sends up tall, upright flower spikes above a clump of narrow, strap-like leaves. It emerges early, blooms in late spring, then goes dormant by mid-summer.
Size
- Height: commonly 2–4 ft (60–120 cm), sometimes taller in rich soils
- Spread: 8–18 in (20–45 cm) per clump over time
Leaves
Basal rosette of long, blade-like green leaves, typically arching slightly. Leaves appear before flowering and begin yellowing shortly after bloom as the plant prepares for summer dormancy.
Flowers
Star-shaped blooms with six pointed tepals, usually blue to violet, with white forms and cultivars also common. Flowers open progressively along the spike, giving a long “ladder” bloom effect.
Fruit and Seed
After flowering, forms capsules containing black seeds. Seed set is common if pollinators have access.
Lookalikes and Safety Note
In regions where wild harvesting occurs, camas bulbs have historically been confused with death camas (Toxicoscordion spp.), which is poisonous. Garden cultivation avoids this issue, but the caution is worth stating for general readers.
Known Range
- Native range: Western North America, especially the Pacific Northwest and adjacent regions (meadows, open woods, seasonally moist prairies)
- Cultivated range: Widely grown in temperate gardens as an ornamental bulb and naturalizing meadow plant
Care and Habitat
Light
- Best: Full sun to partial sun
- Tolerates: Light shade (may bloom less heavily)
Soil
- Ideal: Moist in spring, then drying out in summer; well-drained but not sandy-dry in the growing season
- Preference: Loam or clay-loam that holds spring moisture
Water
- Spring: Regular moisture supports strong bloom
- Summer: Minimal water once foliage yellows; it prefers a drier rest period
Temperature and Hardiness
Cold-hardy in most temperate climates; thrives where winter chill and a true spring season exist.
Wildlife Value
Excellent pollinator plant (bees especially). Deer resistance varies by pressure and local browsing habits, but it’s often less targeted than softer perennials.
Propagation and Reproduction
- Bulb division (offsets): Most reliable. Divide when dormant (late summer to fall).
- Seed: Viable but slow. Expect multiple years to reach flowering size. Best sown outdoors to experience natural cold cycles.
Pests, Diseases, Threats
- Slugs/snails: Can chew young growth in wet springs.
- Bulb rot: Risk increases with soggy, poorly drained soil during dormancy.
- Rodents: Voles/mice may dig bulbs in some settings.
- Crowding: Over years, dense clumps can reduce flowering until divided.
Additional Notes
Large camas reads like a “meadow chandelier” when planted in drifts. It’s one of the rare bulbs that looks equally at home in formal borders and in loose, naturalized grassland plantings—because its life cycle matches the seasonal rhythm: lush spring growth, then a clean exit.
Maintenance and Management
- Do not cut foliage early. Let leaves yellow fully so the bulb can recharge.
- Mark planting areas. It goes dormant; summer weeding can accidentally disturb bulbs.
- Divide every 3–6 years if flowering declines or clumps get tight.
- Pair smartly: Combine with later-emerging perennials or meadow grasses that fill in after camas dies back, so the space doesn’t look “empty” in summer.
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