Grand Collomia
Collomia grandiflora
- Native to:
- Canada, United States
iNaturalist: © rappman (iNaturalist #6488502)
Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Polemoniaceae
- Genus:
- Collomia
- Species:
- Collomia grandiflora
- USDA Symbol:
- COGR4
Growth Characteristics
- Life Cycle:
- Annual
- Growth Habit:
- Forb/herb
- Height:
- 100 cm
- Light Requirements:
- Part Shade
- Drought Tolerance:
- Medium
- Bloom Months:
- may,jun,jul,aug
- Bloom Colors:
- yellow, salmon, cream, orange
Wildlife Benefits
- Bees:
- ★☆☆☆☆ Documented bee visitation (GBIF)
- Butterflies & Moths:
- ★☆☆☆☆ Documented Lepidoptera association (GBIF)
Garden & Ecology Notes
- Wildlife Value:
- bees, hummingbirds
- Fire Ecology:
- Fire adapted — tolerates or benefits from fire
- Fire Notes:
- Pioneer species that colonizes disturbed areas including post-fire sites. Benefits from disturbance.
Soil Requirements
- Soil Type:
- well-drained, sandy or rocky soil
- pH:
- 6.0 - 7.5 (slightly acidic to neutral)
- Drainage:
- excellent drainage required
- Moisture:
- dry to moderate
- Notes:
- prefers open, sunny locations
Propagation & Germination
- Stratification:
- Cold/moist stratification required — 30–60 days
- Germination Time:
- 14–30 days
- Notes:
- Seeds germinate best with cool temperatures. Can be fall-sown for natural stratification.
The above propagation data sourced from Claude AI
Pre-treatment: Seeds sown into a soil-less peat-based media (Sunshine #1) amended with micro-nutrients (Micromax) and slow release fertilizer (Osmocote 14-14-14). Placed in a walk-in cooler at 35-40 degrees for 4 weeks. No pre-treatment required for seeds stored under cool, dry conditions.
Establishment: Seed is collected when inflorescence begins to dry and capsules begin to open. Maturity usually occurs in late July or early August. Seeds are dark brown at this point. Entire plants are cut off at the base when top seeds shatter. Plants are placed in a screen-covered container and left to dry. Conflicting information on pre-treatment: one protocol suggests no pre-treatment required, another suggests a 4-week cold stratification.
Source: npn.rngr.net
ORGHPS Germination Guide: Sow @ 4C.