Verdant
Etymology
From Old French "verd" ("green") and ultimately Latin "viridis" ("green"), from "virere" ("to be green or to flourish"). The word entered English carrying that sense of fresh, growing greenness, and it has kept it ever since.
adjective · /VUR-dunt/
Green with lush, thriving vegetation.
What it names
The word for the vivid green of flourishing plant life — rolling hills, a rain-fed valley, a well-watered lawn.
Example
After the rains, the once-brown hills turned verdant.
Related idea
Lush stresses dense, abundant growth; verdant stresses specifically the fresh green color of that growth.