American Blue Vervain is an attractive, stout-stemmed perennial with numerous pencil-like flower spikes branched upwards like the arms of a candelabra. Each flower spike has a ring of blue-purple flowers; the flowers at the bottom of the spike bloom first, and the ring of flowers appears to advance upward to the tips of the spike. This is a very attractive perennial herb whose ornamental value should not be overlooked. Host plant for caterpillars of the Common Buckeye and Junonia Coenia.