We 10man, 1 shot with 2 tanks. With the 3 adds, tank whatever you can, burn it all. Ranged and melee should know to kite if they get aggro from a specific type of add.
As important as Freya is her trash!
The small flower packs: Separate the large flower by any means possible from the smaller ones, shockwave small ones and kite the large one with earthbind/frost trip works well (small flowers are untankable). Purge/dispel large flower. Once large flower is dead, its GG on small flower.
4 packs aren't bad, just use as much CC as possible - sleep, repent, trap, sap, fear, etc. Face dragons away from the raid.
2 Packs with large tree - Seperate large tree from the nymph - burn nymph. Once nymph is dead the large tree needs to be taunted off due to a movement debuff placed on the tank.
First Elder, right side on entrance - As he gains ironfist and crushes bones he moves slowly, he should be kited when this happens (tank swaps don't work!)
Back right elder, tank & spank as far as I could tell
Back left elder, move him out of the sunbeams and keep DPS on him.
I apologize if this is mentioned in the video, I can't watch it at work! Oh, and Freya's aggro radius is HUGE! We missed our 'undying esque' achievement because he puller her on trash