The post-harvest life of cut Eustoma grandiflorum flowers is limited by poor bud opening and bent neck in open flowers. Vase solutions containing up to 6% sucrose or glucose improves the quality and vase life of the flowers. The additional carbohydrate improves petal colour, increases bud opening, strengthens flower stalks and extends overall inflorescence longevity by up to 8 days. The principal sugar in the petals of open flowers was glucose, with lower concentrations of sucrose and fructose. The presence of sugar in the vase solution greatly increases the concentration of sugars in the perianth of buds and open flowers. Eustoma flowers are affected by exposure to ethylene and pre-treatment with 1-MCP (1-methylcycopropene) or STS (silver thiosulphate) delays final senescence of flowers that have been held in solutions containing sugar. M.C. Cho, F. Celikel, L. Dodge ISHS Acta Horticulturae 547: III International Symposium on Rose Research and Cultivation www.actahort.org