Can you keep up regrowth and rejuv indefinately in your spec without running out of mana if you needed to? A 40/0/31 spec is probably the way to go. I would probably take swiftmend over treants. With swiftmend glyph the HoT isnt removed and it would be a 100% HP button every 15 seconds. Also I noticed without the glyph if all the druids swiftmend at the same time it only consumes 1 of the HoTs, must be a lag thing.

It's going to be hard for me to drop wild growth though. It's such a good spell to just live through AoEs and not worry about which toon has aggro.