The only one Graham Stuart Thomas cares to describe and what a beauty it is! A priceless mid and late summer plant, with crowded spikes of deep purplish-red flowers above a low bush of aromatic sage-like growth.
For best results, sow immediately onto a good soil-based compost. Cover the seeds with fine grit or compost to approximately their own depth. They can be sown at any time, and germination can sometimes be quicker if kept at 15 to 20 degrees C. We sow most seeds in an unheated greenhouse and wait for natural germination, as many seeds have built-in dormancy mechanisms, often waiting for natural spring germination, hence giving them a full season of growth.