Platanthera grandiflora (Bigelow) Lindl.

Greater Purple Fringed Bog Orchid

Facts About

Accepted Synonym: Blephariglottis grandiflora

Platanthera grandiflora, commonly called Greater Purple Fringed Bog Orchid, is found across the East Coast of the United States and Canada, from Georgia to Quebec. It has 2-6 wide, spreading leaves along its stem and produces a showy inflorescence of multiple bright purple, pink, or rarely white flowers. The labellum is deeply fringed and three-lobed. Primarily a wetland species, it can be found in moist forests and fields, marshes, bogs, and swamps.

Platanthera grandiflora is considered globally secure, but is considered rare or extirpated in several mid-Atlantic states. It is less common than the similar-looking Platanthera psycodes, from which it can be distinguished by its larger flowers and overall size, and by its earlier blooming period. It is known to form a natural hybrid with P. lacera, named P. × keenanii.


Swallowtail butterflies such as Papilio glaucus, Papilio polyxenes, Papilio troilus and the moth, Autographa ampla, are documented pollinators while visiting flowers for nectar.

Ecosystem Type

Bogs, disturbed habitats, forests, marshes, meadows, swamps


Leaf arrangement:
Number of leaves on stem:
  • two
  • three
  • four
  • five
  • six
Form of the labellum:
the labellum is not pouch-like
Labellum outline:
the labellum is fringed
Main color of labellum:
  • blue to purple
  • pink to red
  • white
Nectar spur:
Inflorescence type:
the inflorescence is a raceme
Labellum characteristics:
  • the labellum has a spur
  • the labellum is fringed
  • the labellum is lobed
Labellum length:
10–25 mm
Sepal length:
6–10 mm
Plant height:
27–120 cm
Show All Characteristics

Native to North America


North American Conservation Status & Distribution

Conservation Status

Select a location to view conservation status:

Conservation and Wetland Status
Global Rank Secure
US Status N/A
Canadian Status Sensitive

North America Distribution

Adapted from USDA data