When do sexual/asexual plants reproduce sexually

When food sources have been depleted, the climate becomes hostile, or individual survival is jeopardized by some other adverse change in living conditions, these organisms switch to sexual forms of reproduction. Sexual reproduction ensures a mixing of the gene pool of the species. The variations found in offspring of sexual reproduction allow some individuals to be better suited for survival and provide a mechanism for selective adaptation to occur. In addition, sexual reproduction usually results in the formation of a life stage that is able to endure the conditions that threaten the offspring of an asexual parent. Thus, seeds, spores, cysts or other “dormant or quiescent” and resistant form ensure the survival during unfavorable times and the organism can “wait out” adverse situations until a swing back to suitability occurs in order to carry on its asexual reproduction.