fbx format have vertex color data too. leaves diffuses can mix by vertex color for old and young leaves. also can apply simple wind with selecting by vertex color. these are program based special effects. every program has different method.
4 type of grass, zizania, phragmites, ficus, clover, rumex, ivy, pansy, daisy, dandelion, poppy, lavander, hydrangea, tulip, rose, lewisii, zinnia