I can’t imagine my garden in autumn now without this crazy late blooming blue, blue blue perennial. To 4’x 4′ long stems terminate in clouds of bright blue guppy shaped flowers beginning in mid-October and continuing usually until the first hard freeze- often mid-December in the city. Part shade in deep rich moisture retentive soil. Kind of a quiet plant until autumn and then holy shit. Clouds of blue guppies people. Clouds of blue guppies. Often it gets yellow fall color simultaneously with this display. Incredible cut flower at a weird time of the year. Regular water all through summer. This plant gets big, big, big. Perfectly hardy to cold way below zero. So happy I found you Rabdosia now Isodon which sounds more like a freaking Dinosaur than a groovy late fall blooming perennial.