AbstractIn long‐term experiments comparing the results of single and repeated treatment of dwarf peas with gibberellic acid, both once‐treated and weekly‐treated plants formed more internodes than control plants. The initial high rate of internode formation in the once‐treated peas dropped rapidly reaching that of control plants three weeks after treatment. Weekly‐treated plants maintained a higher rate of internode formation.The ratio of internode lengths of once‐treated plants to control plants was high (over 3) for the internodes which were elongating during or shortly after the single treatment but dropped rapidly and approached unity in later‐developed internodes. The ratio of internode lengths of weekly‐treated plants to control plants continued to be high throughout