im not a druid myself but i play other healing classes and i was thinking of an ability that would fit the resto druid as a healing CD
Seed of Life
40% of base mana
3 min cooldown
Plants a seed in the target party or raid member's body that last for 3 minutes, when the target's health drops down to 30% the seed will sprout on the target and applying rejuvenation, regrowth and lifebloom and making the next Nourish cast on that target to have its cast time reduce by half for 10 sec.
it would be exclusive to resto maybe in the 4th or 5th tier