Researches were conducted in the greenhouse of Institute of Soil Science and Plant Cultivation – National Research Institute in Puławy. Plants were cultivated in Mitscherlich pots which contained a mixture of soil and sand in amounts of 5 and 2 kg per pot, respectively. The first row factor was blue lupine variety: Graf and Boruta, and the second factor was type of water used for plant watering: Wk – non-magnetised water (control), Wp – water conditioned by flow magnetiser, and Wn – water conditioned by fish-plate magnetiser. The aim of undertaken studies was the evaluation of magnetic conditioned water influence on seed germination and growth, development and yielding of lupine. It was found that magnetic conditioned water increased lupine germination. It concerned the time as well as the dynamics of plant emergence. Plants watered with magnetic conditioned water achieved greater absolute growth rate (GR) and relative growth rate (RGR) than plants watered with normal water. The use of magnetic water caused significant seed yield increase of both lupine varieties. Yield increase was a consequence of greater number of pods per plant and greater number of seeds per plant, since the thousand sees mass did not change.