Salvia mexicana 'Limelight'
Salvia mexicana is a highly variable plant in Mexico, some forms growing up to 20ft. tall. 'Limelight' can be recommended in the UK as it starts to flower in August, much earlier than the other forms, which get cut down by frost just as flowering starts. Also it only reaches about 5ft. The large blue flowers and lime-green calyces make this an attractive plant. It is frost-tender, and is propagated by cuttings, and occasionally from seed.