Sempervivum Royal Ruby (July) Sempervivum Royal Ruby (August) Sempervivum Royal Ruby (May) Royal Ruby (March) Royal Ruby Large red rosettes in handsome clumps. £2.90 Out of stock. A good red-leafed Houseleek with distinctive, long, pointed leaves in a wonderful shade of red. The colour is fairly dark over winter and brightens in summer. 'Royal Ruby' makes good clumps of large rosettes that will soon fill a clay pot. We like it. Bred by Edward Skrocki (USA) 1971 Well-rooted, established plants, sent in their pots.