It often occurs in small colonies because in reproduces vegetatively via rhizomes. Lobelia cardinalis Growth Habit and Diagnostic Characteristics Cardinal flower is one of the most striking perennial herbs found in freshwater wetlands because of its bright scarlet petals. All other Lobelias have blue, lavender or white flowers. Cardinal flower is also the tallest species within the genus, standing up to 7 feet, but usually ranging from 2.5 to 5 feet. The individual flowers are arranged in rather tight terminal raceme, with the more mature flowers at the lower part of the inflorescence.
Leaves are simple, alternate with irregular serrated margins.
Colonies of this species stand out among the diverse species often found in wetlands because of the bright flowers and tall stature. Although the plant is perennial, it does not produce tubers or rhizomes, but sends out basal offshoots. The blooming period usually begins in July and often lasts until early October. Distribution Lobelia cardinalis can be found in wetlands throughout Virginia and much of eastern United States. Habitat Cardinal flower is commonly found in freshwater wetlands such as marshes, swamps, bogs, along streams and ditches.