Sardonyx (August) Sardonyx (September) Sardonyx Bright, startling red in spring, paler in summer. £3.20 Out of stock. Bright, startling red in spring losing some intensity over summer but still an appealing red. Has a good shape with long, slender leaves. Medium to large rosettes. Sue Thomas (GB) 2003 Sent in 9cm pots as growing, established plants.