Trimezia (Trimezia spp.) are hardy, flowering perennials with an iris-like bloom. Also called the "walking iris" for their ability to quickly spread, trimezia plants are native to parts of South America, according to the Pacific Bulb Society. The distinctive blossoms of this plant flower in shades of yellow, white and blue and are commonly misidentified as Neomarica longifolia in botanical publications, according to Palm Beach State College's online Landscape Plants for South Florida database. Care of these tropical beauties is relatively simple, as long as they are protected from cold temperatures.
Choose a planting site that is protected from direct sunlight. These plants grow well in either partial or even full shade, according to University of Florida Extension.
Keep the soil moist. While trimezia plants can adjust to a wide range of soil types, notes UF Extension, they do not tolerate hot, dry conditions and grow best when the ground is cool and barely moist.
Fertilize your trimezia plant with a balanced (10-10-10) fertilizer once per month during spring and summer when the plant is actively growing. Consult the fertilizer label, as proper amounts and application instructions vary by product.
Let the foliage and flowers die down completely before cutting them off the plant. This allows the nutrients to return to the rhizome to be stored for the following spring.
Overwinter your trimezia plants by covering them with a thick layer of mulch. While they may freeze to the ground in the winter, they could sprout again in the spring if the mulch is thick enough. Alternately, dig up the rhizomes and store them in a cool, dry location.
Propagate by seed or by dividing the rhizomes in early spring. These flowers will even propagate themselves by growing plantlets, which root in the ground when the flower stalk wilts to the ground, according to UF Extension.