Upright spires of blue flowers to 1.2m from midsummer into autumn on this delightful selection of the north American native. Average to good soil in sun. This form close to the usual wild type.
A brilliant dark purple leaved form of the hardy British native Vervain. Low scrambling clumps ideal for spilling through other plants and over the edges of containers or raised beds. Sun, drained soil. 50cm.
An attractive North American prairie species making upright plants with hairy leaves and spires of light purple flowers in summer to 60cm. Can be short lived but is very hardy.
