Salvia clinopodioides aka Michoacan Blue
Originally named simply as Sp. 1 from Mexico, this became known as S. Sp. 'Michoacan Blue'. Now it has been tentatively identified as Salvia clinopodioides. (However, there is a much smaller, and different salvia also called clinopodioides here!) It is an interesting plant, with royal blue flowers in large whorls, from September onwards. It will be cut back to the ground with frost, but may prove to be borderline hardy. Underground suckers may emerge in June. Best grown in a pot, and kept in a frost-free place in Winter. It has not set seed here.