Plants 2 adds a few new trees, and I'd like to see them receive the same graphical treatment as other trees this mod supports.

You can simply add

shadows.plants2.block.BlockEnumLeaves

and

shadows.plants2.block.forgotten.BlockBushLeaves

to the Leaves Whitelist (F8 -> Block Types -> Leaves Whitelist). This will make all Plants2 Trees and Bushes more "bushy" :)

If you want round logs, you must add

shadows.plants2.block.BlockEnumLog

to the "Wood Log Whitelist".