Application of auxins (e.g., IAA, IBA) and conjugate auxins (e.g., IBA-alanine) to unpollinated pistils makes them develop into seedless fruits or parthenocarps which carry a better market price than the normal fruits having seeds. The concentration of auxins in the ovaries of plants producing parthenocarpic fruits is higher than in the ovaries of plants which produce fruits only after fertilisation. Gibberellins delay senescence in some plants so that fruits can be left on the tree for longer period. Ripening of citrus fruits can be delayed with the help of gibberellins which extends period of marketing.