 Michurin also proposed means for overcoming the genetic barrier of incompatibility during the process of hybridization, such as pollination of the young hybrids during their first florescence, preliminary vegetative crossing, and use of a “mediator”, pollination with the mix of different kinds of pollen.The Soviets began to cultivate Michurin's hybrids of apple, pear, cherry, rowan and others.The variety Antonovka is the most famous apple he developed.