Giant Wildrye
Leymus condensatus
- Native to:
- Canada, Mexico, United States
Matt Lavin (www.flickr.com) from Bozeman, Montana, USA





Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Poaceae
- Genus:
- Leymus
- Species:
- Leymus condensatus
- USDA Symbol:
- LECO12
Growth Characteristics
- Life Cycle:
- Perennial
- Growth Habit:
- Graminoid
- Height:
- 150 cm
- Light Requirements:
- Full Sun
- Drought Tolerance:
- High
- Bloom Months:
- apr,may,jun,jul
Wildlife Benefits
- Caterpillars:
- ★★☆☆☆ Recorded caterpillar host plant (HOSTS Database)
Host Plant for Caterpillars
Apamea cuculliformis, Armyworm moth (Pseudaletia unipuncta), Benjaminiola colorada, Brown Ctenucha (Ctenucha brunnea), Mammifrontia rileyi, Mesapamea stipata
Garden & Ecology Notes
- Wildlife Value:
- birds, small mammals
- Deer Resistant:
- Yes
- Salt Tolerant:
- Yes
- Fire Ecology:
- Fire adapted — tolerates or benefits from fire
- Fire Notes:
- Resprouts vigorously from rhizomes following fire. Native to fire-prone chaparral and coastal sage scrub communities.
Soil Requirements
- Soil Type:
- sandy, well-drained, nutrient-poor soil
- pH:
- 6.0 - 8.0 (neutral to slightly alkaline)
- Drainage:
- excellent drainage required
- Moisture:
- dry to moderate
- Notes:
- thrives in coastal and inland scrub habitats
Propagation & Germination
- Stratification:
- Cold/moist stratification required — 30–60 days
- Germination Time:
- 14–28 days
- Notes:
- Cold stratification improves germination rates. Seeds germinate readily in spring with adequate moisture.
The above propagation data sourced from Claude AI
Pre-treatment: Cold-moist stratification for 30 days at 1–5°C (34–41°F).
Source: Claude AI