Refers to the act or process of raising children, animals, or plants. Often used in compound nouns like 子育て (child-rearing) or 花育て (flower growing).
Raising children is tough, but it's rewarding.
She knows a lot about how to grow flowers.
育つ is an intransitive verb meaning 'to grow up', while 育て is the noun form referring to the act of raising something.
The noun form of the verb 育てる (to raise, to bring up). The kanji 育 means 'grow' or 'raise'.