The lightneng effect may get you close. Think it was the basic lightening effect, but maybe advanced would work too.. Anyway, by tweaking the settings you can get something that looks like a tree growing.
Here’s an old tutorial:
https://library.creativecow.net/articles/simpson_mark/growing_tree.php
You may also be able to use particular to do it… You’d need to use aux particles emitting from the main particles to create the branching. Mike park did a tutorial for a chrstmas tree here:
https://library.creativecow.net/articles/park_michael/red-giant-christmas-tree.php
You may be able to adapt that technique to suit your needs… Adding a turbulence would be my first suggestion.
Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW