FNPS Plant Database

Crinum americanum

string lily, swamp lily

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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:

Showy Flowers, Aroma

Landscaping

Recommended Uses:

Moist wildflower gardens. Easily grown along streams.

Considerations:

Availability:

Native Plant Nurseries

Propagation:

division of bulbs, seed

Light:

Full Sun, Part Shade, Shade

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.



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Ecology

Wildlife:

Caterpillars, Pollinators, Moths

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:

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.

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