Healing Priorities
Always keep Regrowth and Rejuvenation on the tank currently holding the boss (or on both tanks, for example on the Lich King).
Rejuvenation priority: cast it on Rogues and Feral Druids first, then on healers, and only then on everyone else.
Use Wild Growth on cooldown, and cast it on targets who are standing with other players. Wild Growth only affects players within range of the initial target—if you cast it on an isolated player, it will not reach additional players.
If you know the tank is about to take a large amount of damage (e.g. Lich King Soul Reaper, 3 stacks on Festergut, Saurfang berserk, Sindragosa Frost Breath late in the fight, or tank swaps to Keleseth/Taldaram on the Blood Prince Council), have Nature’s Swiftness ready for an instant big heal.
If the tank takes an unexpected spike at any moment, react instantly and use Swiftmend on that tank, as long as you have a HoT on them. This provides a strong instant heal.
Valithria Dreamwalker
There are two options:
a) You heal the raid. Your job is to keep HoTs on the healers who are about to enter portals right before they go in (cast Rejuvenation on them, and if possible also Wild Growth and/or Regrowth).
b) You heal the boss together with other healers. Before entering portals, apply Rejuvenation to the boss (to stack your Idol buff to 8) and use Nature’s Swiftness for instant heals when needed. This is a debatable point, because many believe the boss should be healed with Healing Touch. However, in my view Healing Touch only makes sense if you are already in the final push of healing the boss and Bloodlust has been used; otherwise you simply will not have enough haste to cast reliably and keep the haste buff active.
Also: do not forget to spread Rejuvenation and Wild Growth on other healers even after you enter the portal with them, because on Heroic the damage inside portals is high and it hits hard.
Sindragosa
On Sindragosa, always cast Rejuvenation and Wild Growth on targets who are about to be put into an Ice Tomb before they get frozen. The damage taken there is high, and your job is to ensure they are healed to full HP while inside the tomb, especially if tombs are broken slowly, and to help them survive aura damage when Sindragosa lands.
Deathbringer Saurfang
On Saurfang, in addition to the tanks, keep Rejuvenation and Regrowth on players with Mark of the Fallen Champion.
Clearcasting and Lifebloom
If Clearcasting procs and you have the opportunity, cast Lifebloom on yourself or on your healing target so the Lifebloom cast costs no mana. This can return some mana from the Lifebloom without spending mana on the cast.
P.S. This is not mandatory, but if the opportunity is there, you can do it. Mana problems almost never happen, and there are almost always other things that are better to do than regenerating mana with Lifebloom.
