茂
モ, しげ.る, うむさ, き, し, つとむ, む, もて
overgrown, grow thick, be luxuriant
JLPT1 G7 S8 F1188
As per
戊
# (cover) + 艸 grass/plant → thick vegetation covering a wide area → *thick growth* → *thrive*.
[Full Kanji Etymology List]