Shoots and flower buds of stock (Matthiola incana(L.) R. Br. cv. Sourei) were analysed for gibberellin (GA). After purifying the acidic ethylacetate-soluble fraction by several chromatographic procedures, GA fractions were surveyed by GC-MS and Kovats retention indices (R l ). Consequently, GA 1 , GA 4 , 3-epi-GA 4 , GA 8 , GA 1 9 , GA 2 0 , GA 2 4 , GA 3 4 , GA 3 7 and GA 5 3 were identified. A further GA-like substance was detected and shown to be 12β-OH-GA 1 2 (GA 1 1 2 ) by comparison with an authentic compound prepared by synthesis.