The present invention relates to solutions of CIPC and of one or more terpenes or terpene oils for the antigerminative treatment of bulbs and tubers. This use is particularly appropriate for the treatment of potato tubers. The CIPC solution contains from 50 to 80% by weight of CIPC relative to the total volume of the solution. Examples of the terpenes and terpene oils are eugenol, isoeugenol, clove oil and their salts and mixtures thereof.