栽培
さいばい · saibai · JLPT N1 · noun
cultivation
🌱 栽 = plant a seedling + 培 = pile soil up around its roots = cultivation
栽 means to plant and 培 means to heap earth around a root, so 栽培 covers sowing a crop and then tending it as it grows.
栽 — plant 𢦏 (phonetic) + tree 木
A semantic-phonetic compound: 木 (tree/plant) gives the meaning, while 𢦏 (zāi) supplies the sound. Originally referred to planting saplings or seedlings in soil, and by extension came to mean 'to plant, cultivate, or grow' more generally, as in 栽培 (to cultivate).