расса́дник — meaning in English

rassadnik

English meaning

hotbed noun A place or situation where something, especially something undesirable, develops quickly and intensely.
nursery noun A place where babies are breastfed or where young children are cared for and brought up.

расса́дник is used for these senses in English:

breeding-ground (figuratively) A place or institution seen as creating large numbers of a stated thing, type of person, etc.
hotbed (by extension) An environment that is ideal for the growth or development of something, especially of something undesirable.
nursery (horticulture) A place where young shrubs, trees, vines, etc., are cultivated for transplanting, or (more generally) made available for public sale, a garden centre; also (obsolete) a plantation of young trees.
nursery (countable, also, figuratively) A place where anything is fostered and growth promoted.
seedbed Ground prepared for the planting of seeds.

noun A place where babies are breastfed or where young children are cared for and brought up.
noun Particularly in parts of Europe: a room kept just for looking after children in the home.
noun A daytime centre that looks after young children who haven't started school yet, while their parents are at work.
noun The earliest year of pre-school education.