栽 means “plant, cultivate”

さい · sai

Also: plantation, planting

On'yomi (Chinese reading)
サイ

JLPT N1 · Taught in secondary school · 10 strokes

The story

A tree (木) tucked under a halberd (戈): picture a blade pruning a tree into shape. 栽 is planting and tending: 栽培 is cultivation, and 盆栽, a tree in a tray, is the art Japan sent around the world as bonsai.

Used in 盆栽 (bonsai, bonsai), 栽培 (saibai, cultivation), and 植栽 (shokusai, planting/landscaping)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.