The leaves, or more generally, the green part of a cannabis plant.
Merriam-Webster Online Dictionary
foliage (noun)1.
a representation of leaves, flowers, and branches for architectural ornamentation
2.
the aggregate of leaves of one or more plants
3.
a cluster of leaves, flowers, and branches
Merriam-Webster Online Thesaurus
foliage (noun)green leaves or plants
SYNONYMS:
flora, foliage, green, herbage, leafage, vegetation, verdureRELATED WORDS:
grassland, prairie; underbrush, undergrowthleaves, greenery, plant matter, vegetation, leafage
