How is it a control build if you are not playing tangle or strangle vines? Strangle vines ROCK.
I would cut some of the rhino hides. also one, maybe 2 rouse the beast.
Also Flying and Rooted don't work how you would like it to. you can only make Kralathor flying.
Remember you also are trained in Level 1 spells, Dissolve, Rust, Geyser, Surging Wave.
I am not a fan of the nightshade lotus.
what about a couple seedling pods to use as diversions. They cost 2 mana to play (ring), if they pop and can summon a creature, bonus. if they get killed, at least they weren't attacking you.
I don't really find tangle vine any good since my opponent often will teleport and I will have spent more mana. I could have one too finhish my opponent off but if that would be the case I'm probably wining anyways and I want too spend spell points on other things.
So many plant creatures have a good life total and they regenerate but with no armor they are easy too kill. Rouse the beast can be very useful too play especially on kralathor but also on vine snapper or raptor vine.
And yes the eagle wings are meant too keep kralathor alive.
Personally I am not a big fan of rust because it is easier too deal with than corrode but that's just my opinion.

Btw I did include both surging wave and geyser.
I didn't include dissolve because of the two orchids and my acid balls.
I love nightshade lotus simply because it gives me an free action attack. Orchids are better but you are not allowed too have more than one off the same conjuration in the same zone.
Let me tell you why I do not like seedling pod. It is because it have a cost of 3 mana it takes 3 rounds for it too be able too do anything and then in order for them too give any benefit I would have too wait a total of rounds and I think that is way too slow. Now you might be arguing that it only takes 3 rounds because of my ring but the ring gives no discount for spells cast by spawn points.