Kalamona A swamp environment pack. Reed, bamboo, some trees, water lilies, wood-decay fungus, stones. Also some environmental effects like patches of fog, flies and will-o-wisps.
This is a smaller but more affordable asset pack. Tri numbers are between 400 (rock) and 3000 (group of reed). By default some plants use a two-sided shader, others simply have flipped polygons. There is also an ambient-occlusion version of each plant that uses unity's nature shader and works together with terrain.