The effect of temperature on the breaking of dormancy was examined in five species of spring ephemerals, Claytonia virginica, Erythronium albidum, E. americanum, Dicentra cucullaria, and D. canadensis. All species except Claytonia required cold treatment to imitate growth. Dormancy was not broken in D. canadensis under the experimental conditions. Generally, with increasing lengths of cold treatment, the time for subsequent emergence decreased, the time the plants remained green decreased, and up to a point, the size of the resulting plants increased.
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Risser et al. (1967) studied this question.