Winged Loosestrife, Lythrum alatum, is a wetland wildflower species that will grow to 3 or 4 feet and spread as a colony. The summer flowering produces small pale lavender blooms that attract bees and butterflies. This plant is aggressive for most urban landscapes and should be used in restoration or large gardens in full to partial sun and in areas that do not dry out. Loosestrife is not salt air tolerant.