Knotsheath Sedge
Carex retrorsa
- Native to:
- Canada, United States
Matt Lavin (www.flickr.com)






Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Cyperaceae
- Genus:
- Carex
- Species:
- Carex retrorsa
- USDA Symbol:
- CARE4
Growth Characteristics
- Life Cycle:
- Perennial
- Growth Habit:
- Graminoid
- Height:
- 100 cm
- Light Requirements:
- Part Shade,Shade
- Drought Tolerance:
- Low
- Bloom Months:
- may,jun,jul
Garden & Ecology Notes
- Wildlife Value:
- waterfowl, songbirds, wetland mammals
- Deer Resistant:
- Yes
Soil Requirements
- Soil Type:
- rich, moist, organic soil
- pH:
- 5.5 - 7.0 (slightly acidic to neutral)
- Drainage:
- tolerates poor drainage
- Moisture:
- consistently moist
- Notes:
- commonly found in wetlands and marshy areas
Propagation & Germination
- Stratification:
- Cold/moist stratification required — 30–60 days
- Germination Time:
- 14–45 days
- Notes:
- Seeds germinate best with light exposure on moist substrate. Erratic germination is common in sedges.
Pre-treatment: Seeds were cold stratified for 270 days
Source: npn.rngr.net