Tiedemannia filiformis subsp. filiformis

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Water Cowbane


Also known as Oxipolis filiformis

Plant Specifics

Size:To 4 ft.
Life Span:Long-lived perennial
Flower Color:White
Phenology:Blooms late summer and fall.
Noted for:Showy flowers


Recommended Uses:Bog gardens, rain gardens, restoration areas.

All parts of this plant are poisonous if ingested.  Bruised leaves may produce a rash on bare skin

Availability:Specialty providers
Light: Full Sun,  Part Shade
Moisture Tolerance:
always floodedextremely dry
 (Stays Wet ----- to ----- Usually moist, occasional inundation)
Moisture Tolerance: Stays Wet ----- to ----- Usually moist, occasional inundation
Salt Water Flooding Tolerance:Not salt tolerant of inundation by salty or brackish water.
Salt Spray/ Salty Soil Tolerance:Unknown
Soil or other substrate:Pond, lake, or stream bottom, Organic material (muck)
Soil pH:Slightly acidic



Host plant for black swallowtail.

Attracts generalist pollinators.

Native Habitats:Marshes, wet flatwoods, wet prairies, seepage slopes, edges of cypress wetlands, ditches

Distribution and Planting Zones

Natural Range in Florida
USDA Zones

Suitable to grow in:
10A 10B 8A 8B 9A 9B 

USDA zones are based on minimum winter temperatures


General Comments:

The range of this species is primarily the coastal plain from Texas to North Carolina.

A second subspecies (subsp. greenmanii) occurs in the Florida Panhandle where it is endemic and state Endangered