1) Foliage 2) Leafage 
the formation of leaves
• (n.) The time at which each species of plants unfolds its leaves. • (n.) The act of bursting into leaf.
Fron·des'cence noun (Botany) (a) The time at which each species of plants unfolds its leaves. (b) The act of bursting into leaf. Milne. Martyn. 
the process or period of putting forth leaves, as a tree, plant, or the like. · leafage; foliage.