- 茂る — to grow thick; to be overgrown
- 茂み — thicket; bush
- 繁茂 — luxuriant growth; profuse vegetation
With the grass/plant radical 艹 on top and a sound element beneath, 茂 paints a picture of vegetation growing dense and vigorous. It’s the feel of leaves and stems crowding together — hence “to grow thick; luxuriant.”