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hybrids

20 years ago

does anyone know if all hybrids such as heuchera x tiarella - heucherella and so on, are always sterile, needing vegetative propagation? In animals, interspecies hybrids are always sterile although apparently, there has been inter-species breeding between some south american )I think) monkeys creating a new subspecies. Can this happen in the plant world, anyone?

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