Smooth sowthistle (Sonchus oleraceus L.)

Family: Asteraceae Dumort 
Stems, thick, ramified, up to 30 - 120 cm.
Leaves first leaves nearly circular, with fine teeth; following leaves runcinate-pinnatifid or undivided, soft, blue-green, enclosing the stalk sagittately.
Root system vertical root.
Flowering in june - october.
Inflorescence - fruit Achene, Seeds are brown, wrinkled,size 2,5-3,5x1,2-1,3x0,2-0,3 mm.
Propagation by seed, approx 4,000-5,000 seeds/plant. Seeds are dispersed by wind.
Germination at temperatures of 2-24°С, seeds germination primarily in spring.
Distributed everywhere, especially on sandy soils.
To litter field crops, especially gardens, grow in gardens.