It's interesting what you notice...

[Wyrm]

Was playing earlier today when I realized I could heal my Druid with Oak Sage, since when Oak goes into effect, it adds to your current hp, but when it goes kerplow it doesn't subtract from them. Now I pretty much just use Oak Sage to heal in/after a fight (I use an elemental druid, go me) and ignore carrion vine since the mana really isn't a problem.

Anyways, yeah, this has probably been around for a while and I'm just being my oblivious self, but hey, it's kinda neat when you find something out you didn't know before.