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A single-factor field experiment was conducted in 2008 and 2009. The aim of this study was to evaluate the low-morphine poppy cv. Mieszko which was sown at three different dates: I-early, II-optimal, III-delayed. The results of the experiment demonstrate that there is no difference between morphological traits at characteristic growth stages. Plants in the population varied in the number of poppy heads (from 1 to 6). Plant productivity in the crop depended on the sowing date and growing year. Sowing poppy at the early and optimal date allowed more productive individuals that produced poppy heads with a higher unit weight to be obtained in the crop population. The most productive plants in the crop formed 3 or more poppy heads per plant. The results of experiment proved that the date of poppy sowing had a significant effect on plant growth and, as a consequence, on yield, in spite of the fact that it is a no-cost agrotechnical factor. For utilitarian reasons, efforts should be made to do sowing at the optimal time

Comparison of growth and productivity of the low morphine poppy Papaver somniferum L. cv. Mieszko depending on the sowing date