The use of a member of the caffeine family as a plant reproductive growth stimulator, and in the promotion of maturity in plants. In particular the use of a member of the caffeine family in promoting flowering, colouration or fruiting in plants. Also agricultural compositions comprising a member of the caffeine family present at a concentration in the range of 50 to 500 ppm and agricultural compositions which comprise (i) a member of the caffeine family and (ii) a plant nutrient or a compound of formula (I) wherein R1 is a C1-10 alkyl group, or a C2-10alkenyl group and M is a cation of valency n. Also formulations containing the compositions and methods of their uses are included.
