American Rockbrake
Cryptogramma acrostichoides
- Native to:
- Canada, Russia, United States
iNaturalist: © johndreynolds (iNaturalist #19513312)






Taxonomy
- Division:
- Pteridophyta | - Ferns
- Family:
- Pteridaceae
- Genus:
- Cryptogramma
- Species:
- Cryptogramma acrostichoides
- USDA Symbol:
- CRAC3
Growth Characteristics
- Life Cycle:
- Perennial
- Growth Habit:
- Forb/herb
- Height:
- 30 cm
- Light Requirements:
- Part Shade
- Drought Tolerance:
- Low
Garden & Ecology Notes
- Deer Resistant:
- Yes
Soil Requirements
- Soil Type:
- rocky, well-drained, nutrient-poor soil
- pH:
- 5.5 - 7.0 (slightly acidic to neutral)
- Drainage:
- excellent drainage required
- Moisture:
- dry to moderate
- Notes:
- prefers rocky crevices and slopes
Propagation & Germination
- Notes:
- Fern reproduces via spores; requires moist, shaded conditions for gametophyte development.
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