any good commercial formulated potting mix, well drained home mix
grows best in the cool season, hardy to about 28 degrees F (Pan America Seed)
8-12 inches tall, compact
dead heading, cut back hard after flowering
The common name "Twinspur" comes from the two spurs or pouches found on the flower. Diascia from Greek: di meaning two, anthos meaning sac.
I have grown this plant for a few years in full sun and it preformed admirably.
Notes & Reference
#51-Armitage's Manual of Annuals, Biennials, and Half-Hardy Perennials (Alan Arimitage), #109-Annuals and Tender Perennials for North American Gardens (Wayne Winterroud), Pan America Seed Company fact sheet