Wild growth ftw. These are screenshots of recount during our one shot of razorscale on 25.
Basically for raid healing I pop wild growth as much as possible. Since it counts as a HoT, I then proceed to use Nourish on as many people as possible that were hit with wild growth to maximize my hps (nourish needs a hot rolling to be effective). With a bit of haste, you can easily get your cast time on Nourish at about 1.4 seconds. This gives you time to cast nourish 3-4 times before the cooldown on wild growth goes out (6 seconds).
The mechanics of wild growth also helps your overhealing. Wild Growth will hit the 5 people that need heals the most in a 10-15 radius around the target it's cast on (also makes it a perfect spell for raid healing at a distance)
