KanjiJLPT N1
Overgrown

overgrown, grow thick, be luxuriant

Mnemonic

A grass field has grown so wild and thick that a full battalion of soldiers marches in and vanishes completely. Officers shout orders, but the grass swallows every voice. The entire military zone is hopelessly overgrown—nature has devoured the battlefield whole.
Additional thoughts
Picture soldiers waist-deep in grass, unable to see each other—the battalion literally consumed by vegetation. The grass radical sits atop the battalion radical, smothering it.
Quick recall
Grass swallows a whole battalion—the field is totally overgrown.

Details

The keyword for 茂 is overgrown. This kanji describes the state of vegetation growing thickly and luxuriantly, suggesting lush, dense plant life that has flourished abundantly. It conveys the image of grass, trees, or foliage that has grown so prolifically that it covers an area in a wild, unrestrained manner. By extension, it can also carry the positive connotation of thriving prosperity and vigorous growth.
On'yomi
Kun'yomi
しげ.る