A video I made for my daddy to promote his website called Voobox, check it out here if you need to design your own web pages easily ! I had fun to create some scripts to handle the tree's growth, working with blendshapes and a large amound of Maya's Average Vertices, to simulate the growth, like that ;
Which can be associated with a Grow Selection, but result can be .. unpredictable !
Then, connecting the whole thing to a blendShape we get ;
Check sample code here and more in Scripts section !