180 (220)cm, Red Stem Flag is a half-hardy aquatic perennial from swamps and wetlands in Southern USA (Florida) with most impressive and ornamental, tropical looking, banana-like, very large leaves emerging from a beautiful reddish pseudostem in this form we offer. This red form is usually offered under the invalid name Thalia geniculata f. ruminoides. It makes up to 4m tall (!), lax racemes with pendulous pale violet-lavender flowers. For any humus rich soil in shallow water in full sun. Excellent for the border of a pond. In cold regions protect dormant rhizomes from freezing through with some insulating protection material (e.g. air-cushion foil). VIII-IX.
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