Tolmie Star-Tulip

Calochortus tolmiei

Native to:
United States

📍 View on iNaturalist →

Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Liliaceae
Genus:
Calochortus
Species:
Calochortus tolmiei
USDA Symbol:
CATO

Growth Characteristics

Life Cycle:
Perennial
Growth Habit:
Geophyte
Height:
40 cm
Light Requirements:
Full Sun
Drought Tolerance:
Medium
Bloom Months:
apr,may,jun
Bloom Colors:
white, pink, purple

Wildlife Benefits

Bees:
★☆☆☆☆ Documented bee visitation (GBIF)
Butterflies & Moths:
★☆☆☆☆ Documented Lepidoptera association (GBIF)

Garden & Ecology Notes

Wildlife Value:
bees

Soil Requirements

Soil Type:
well-drained, sandy or rocky soil
pH:
5.5 - 7.0 (slightly acidic to neutral)
Drainage:
excellent drainage required
Moisture:
dry to moderate
Notes:
native to open, grassy hillsides and woodlands

Propagation & Germination

Stratification:
Cold/moist stratification required — 60–90 days
Germination Time:
14–30 days
Notes:
Seeds require cold stratification for 2-3 months; sow in fall or early spring.

Pre-treatment: Cold-moist stratification for 30 days at 1–5°C (34–41°F).; then Cold-moist stratification for 60 days.

Source: Claude AI

ORGHPS Germination Guide: Sow @ 4C for 3 weeks, then place @ 20C.

Source: Ontario Rock Garden & Hardy Plant Society