The four accessions, grown under the same conditions as winter annual crops, showed a different percentage of plants that turn to flower, while some of them remained in the vegetative rosette stage, underlying a distinct response to low temperatures for vernalization. As a mean value, 76% of the plants flowered, and II1 accession showed the highest percentage of flowering. No significant differences were found for plant density, plant height and productive characteristics (Table 3). At harvest time, the plants reached a maximum height of 0.87 m (±0.09) and a plant density of 38 plant m−2 (±4.1), as mean value. The four I. indigotica accessions showed good agronomical performances, giving a mean siliculas yield (on a dry-weight basis) of 1.36 t ha−1 in a relatively short growing cycle (about four months) (Table 3). Ripeness occurred when the husks were blue–black and the stems and leaves were turning brown. Full ripeness led to a loss of seed yield, due to the high siliculas scattering.