The following Lythrum (purple loosestrife) cultivars are derived from Lythrum virgatum that are sterile or nonaggressive and can be sold for planting in ornamental gardens.
Any person selling or offering for sale any or all of the above-listed varieties shall prominently display a sign to inform purchaser it is legal to plant the above-listed Lythrum virgatum in "ornamental gardens" only.
Iowa Admin. Code r. 21-58.2