According to data available for Europe, the annual growing season has been lengthening, particularly in central and southern Spain, central Italy, along the Atlantic coast, on the British Isles, in Denmark and in Central Europe (also in Slovenia). The lengthening of the growing season is expected to continue throughout Europe, mainly due to its earlier start in the spring and later end in the autumn. Lengthening of the annual growing season will cause the expansion of more heat-demanding plants towards northern parts of Europe where cultivation of such crops has not been possible so far.