Originally Posted by
Dracodraco
However, Nourish takes 7% of base mana. Healing touch is stated to devour 38% of it, and as we know, Blizzard is trying to make us run out of OOM next expansion!
So basically/TL;DR :
With full hots going (which should honestely be the only reason you would consider nourish spamming in todays game), nourish heals for the same as healing touch. The higher your spellpower gets, the stronger healing touch gets. But healing touch is a manawhore of dimensions, so Nourish is more conservative, and keeps your lifeblooms rolling at the same time.