 Cultivars with variegated foliage, regardless of what other Group they may belong to.The growing conditions in a conservatory are quite specialised and do not suit many cultivars, this group have been selected for thriving in this environment, required features being plant vigor, early flowering, foliar appearance, self-cleaning ability and good propagation qualities.The originator of this group was Robert Armstrong (geneticist) while he was working at Longwood Gardens in the United States in 1967.