We carried out the research of reproduction Oxalis stricta L. in South Karelia. Reproduction of this species is confined mainly to cultural sites. In areas with dense plant cover O. stricta breeds vegetatively. Vegetative reproduction of this species is provided by rhizomes with buds. By the middle of august 12 buds form per the rhizome of one fertile individual. O. stricta occupies new areas and areas with decreased competition using seed reproduction. In South Karelia 42 flowers form per shoot of O. stricta. Factual seed production of single shoot is 1100 seeds. In South Karelia O. stricta breeds active enough to support abundance in cultural areas without human assistance. But today this species doesn’t show invasive characteristics.
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