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An attractive vine native to the Sonoran Desert regions of Arizona and Mexico, and to Florida, Texas, the West Indies, and parts of Central and South America. Showy clusters of small white flowers may appear year-round or during the warmer seasons, depending upon climate. Attracts blue and hairstreak butterflies and is a larval host plant for the Miami blue and the silver-banded hairstreak. Highly ornamental inflated seed pods follow the bloom and age to an attractive rosy tan. Each seedpod contains a few round seeds which, when ripe, are black and marked with a distinctive creamy heart. Although the plant may die back to the ground after a hard frost, it quickly grows back from the roots in late spring. Where not hardy as a perennial, it may be grown as a half-hardy annual.

Bartlettina sp. is sometimes sold as Ageratum corymbosum, but it does not fit the botanical description of Ageratum corymbosum (flat-top whiteweed, desert ageratum). The tall, purple-leaved shade plant with large clusters of pinkish-purple flowers that is sold under this name is properly a Bartlettina. The true species is a tough, desert-adapted plant that is shorter, green-leaved and with misty blue flowers. See here for a true repesentation of A. corymbosum: https://calphotos.berkeley.edu...