Verdure is lush green foliage, the kind you'd find in a beautiful garden, in a park, or in a forest.
Verdure is related to many words for the color green, and that's exactly what it means: greenery, and a lot of it, in nature. This word conveys a sense of life: think of a park where there's green everywhere you see. That's verdure. A forest will have even more verdure, and you could find verdure in someone's garden, if it's a big one with a lot of plants. Verdure is so brightly alive that it makes people feel good.