滋
ジ, し, しげ, しげる
nourishing, more & more, be luxuriant, planting, turbidity
JLPT1 G7 S12 F1563
As per 茲# (luxuriant growth) +
水
water → luxuriant growth of water plants → *thrive*; *luxuriant*; *rich*.
[Full Kanji Etymology List]