You have ~7 channelling boosters. you really gonna get 3.5 turns of isolation to cast those? Also, with a spawnpoint tree are you really going to benefit from that plant ring? Maybe if you are casting all those mana flowers yourself.=
The mage would have to be casting the mana flowers; [mwcard=MW1J13]Mana Flower[/mwcard] is not a vine spell, so the tree can't cast it. I agree that there are too many channeling boosters in this deck, especially considering how expensive Togorah will be to cast. There is no way to both get out the channeling and cast Togorah in time to save the tree. Honestly, if the objective is to protect the tree, I would strongly recommend a [mwcard=MWSTX1CKC06]Guardian Angel[/mwcard] or [mwcard=MWSTX1CKC08]Gargoyle Sentry[/mwcard] instead; they are much cheaper, leaving more mana for offense, and do not share the fire weakness of the tree. They also have the same spellbook cost as Togorah.
I also recommend the following:
1. Add a Steelclaw Grizzly or two for matches against Fire Wizards/Warlocks
2. Add Knockdown so that you can use Tanglevine or Stuck on major flying creatures, like Adramelech. Turn To Stone would also work.
3. Include 1-2 seedling pods. Very useful when you have a spare action but not much mana, to avoid wasting it. Makes the druid more efficient.
4. If you are going for a plant focus, include a [mwcard=MW1J21]Suppression Orb[/mwcard]; It's not like your creatures will be moving anyway.