The inductive effect of a cold treatment on flowering in peas have been studied. It has been found that the 2 late varieties studied are normally vernalizable with respect to both flower formation and vegetative development and that these 2 phenomena can be separated. A pretreat-ment during germination at 20 or 26[degree] C for up to 5 days prior to the optimal cold treatment results in a progressive loss of ability to be vernalized. Plants remain vernalizable for up to 3 days at 20[degree]C. At 26[degree]C they remain vernalizable for only 1 or 2 days. The pretreatment at either temperature has no effect on vernalization with respect to vegetative development.