Radical
Garden

Mnemonic

A person kneels beside a young tree, carefully pouring a splash of water at its roots. Day after day, the person tends more trees, each with its splash of water, until a magnificent garden stretches out before them.
Additional thoughts
Picture someone lovingly watering a single sapling that eventually becomes a whole garden full of trees. The act of nurturing — person + tree + water — equals garden.
Quick recall
A person waters a tree with a splash of water, growing a lush garden.

Used in kanji