Northern Marsh Yellowcress
Rorippa islandica
- Native to:
- Austria, France, Germany, Greece, Iceland, Ireland, Italy, Kazakhstan, Norway, NW. Balkan Pen., Russia, Spain, Switzerland, Ukraine
Ragnhild&Neil Crawford (www.flickr.com) from Sweden
Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Brassicaceae
- Genus:
- Rorippa
- Species:
- Rorippa islandica
- USDA Symbol:
- ROIS2
Growth Characteristics
- Life Cycle:
- Annual | Biennial
- Growth Habit:
- Forb/herb
- Height:
- 60 cm
- Light Requirements:
- Full Sun
- Drought Tolerance:
- Low
- Bloom Months:
- may,jun,jul,aug,sep
- Bloom Colors:
- yellow
Garden & Ecology Notes
- Wildlife Value:
- waterfowl
Soil Requirements
- Soil Type:
- moist, nutrient-rich, silty soil
- pH:
- 5.5 - 7.5 (slightly acidic to neutral)
- Drainage:
- tolerates poor drainage
- Moisture:
- consistently moist
- Notes:
- commonly found in wet meadows and marshes
Propagation & Germination
- Stratification:
- Cold/moist stratification required — 30–60 days
- Germination Time:
- 7–21 days
- Notes:
- Seeds germinate readily in moist conditions; light may enhance germination.
The above propagation data sourced from Claude AI