The effects of different media, temperatures and plant growth regulators on the ex vitro propagation of
twin-scale cuttings as well as on the relationship between starch degradation and bulblet development
of Hippeastrum vittatum cv. ‘Red lion’ were studied. Sawdust was the most optimal medium for the
propagation oftwin-scale cuttings resulting in the lowest percentage of rotting scales and the best quality
bulblets. Furthermore, 25 ◦C was a more suitable temperature than 30 or 20 ◦C.