Petrify -> does not affect Totems, root wall or summon vine. The wording on the talent is very explicit that it’s all SKILLS. Looking at the modifiers, I believe the bug is that it’s only targeting spriggan form skills that are labeled as “Spell” specifically
Unbound garden -> Depending on the terrain, sometimes all 3 totems aren’t cast. usually it’s narrow passageways. This makes the bonus of the passive feel broken. Given that totems can stack on top of each other, I believe the logic should be changed to move the totems closer together when the terrain doesn’t allow them all to be summoned spread apart in normal fashion. It’s a nice addition that they’re spread out when circumstances allow as that gives you more area for the healing aura, but it’s lame when they don’t all summon.
Totems, Root Wall & Summon Vine are all minion skills, so that might be why it’s not affecting them, though I’d have thought that with Petrify you should still be paying for half of the casting cost with mana.
Grove Mind on Summon Thorn Totem has the same problem, if there’s not any valid terrain where it wants to spawn the totem it won’t summon a totem.