1Growth, or the manner/environment in which someone (or something) was raised — often used in expressions like '育ちがいい／悪い' to describe someone's upbringing or manners.
彼女は育ちが良いので、いつも礼儀正しい。
She was raised well, so she's always polite.
この苗は日当たりが悪くて育ちが遅い。
This seedling is growing slowly because it doesn't get enough sun.
育ちの違いが、ものの考え方に表れることもある。
Differences in upbringing can sometimes show up in the way people think.
2A suffix attached after a place name or environment, forming '〜育ち' to mean 'raised in/as ~' — e.g. 東京育ち (raised in Tokyo).
彼は東京育ちだから、都会の暮らしに慣れている。
He was raised in Tokyo, so he's used to city life.
海辺育ちの友達と、久しぶりに釣りに行った。
I went fishing for the first time in a while with a friend who grew up by the sea.
農家育ちの彼は、野菜のことなら何でも知っている。
Having grown up on a farm, he knows everything there is to know about vegetables.