FNPS Plant Database
Crinum americanum
string lily, swamp lily
Photographs belong to the photographers who allow use for FNPS purposes only. Please contact the photographer for all other uses.
Nomenclature
Common Name:
string lily, swamp lily
Synonym(s):
Riverine swamps, riverine marshes, open wet prairies.
Genus species:
Crinum americanum
Family:
Amaryllidaceae
Plant Specifics
Form:
flower
Size:
1-2 ft tall by 1 ft wide
Life Span:
long-lived perennial
Flower Color:
white
Fruit Color:
green
Phenology:
evergreen or winter dormant; can bloom at any time of year: in the north generally in spring, in central Florida, often in late fall-winter
Noted For:
Landscaping
Recommended Uses:
Moist wildflower gardens. Easily grown along streams.
Considerations:
Availability:
Propagation:
division of bulbs, seed
Light:
Moisture Tolerance:
Always Flooded------------------------------------------------Extremely Dry
-|---- <------------------------> ----|----|----|----|----|----|-
Aquatic ---to--- Somewhat moist, no flooding
Salt Water Flooding Tolerance:
Tolerant of inundation with brackish water
Salt Spray/Salty Soil Tolerance:
Some tolerance to salty wind but not direct salt spray
Soil or Other Substrate:
Sand, Loam, Organic (muck)
Soil pH:
acidic to neutral
Suitable to Grow In:
8A, 8B, 9A, 9B, 10A, 10B

USDA zones are based on the average annual extreme minimum winter temperature.

Don't know your zone? Click here to search by zip code.
Ecology
Wildlife:
Pollinated by sphinx moths. Larval host for Spanish moth, also known as the "convict caterpillar" (Xanthopastis timais).
Native Habitats:
Riverine swamps, riverine marshes, open wet prairies.
Natural Range in Florida:
Visit the USF Libraries Atlas of Florida Plants
Comments:
Ethnobotany:
General Comments:
This is a wetland plant, but it will do well once established in a moist garden setting.
Citations:
BONAP Plant Atlas. 2014. https://bonap.net/MapGallery/County/Crinum%20americanum.png, accessed 2025. Biota of North America Program, Chapel Hill, NC.
Haehle, Robert G. and Joan Brookwell. 1999. Native Florida Plants. Gulf Publishing Company. Houston, TX.
Huegel, Craig N. 2012. Native Wildflowers and Other Ground Covers for Florida Landscapes. University Press of Florida, Gainesville.
Nelson, Gil. 2003. Florida's Best Landscape Plants: 200 Readily Available Species for Homeowners and Professionals. University Press of Florida, Gainesville.
Wunderlin, R. P., B. F. Hansen, A. R. Franck, and F. B. Essig. 2021. Atlas of Florida Plants. https://florida.plantatlas.usf.edu/, accessed 2025. Institute for Systematic Botany, University of South Florida, Tampa.






