[Nagot Gick Fel]

Originally posted by Cohen:
The problem of Growth enhancing pop spells is that soon your dominion will kill grwoth.
So it's better to pump the population of a fixed percentage with that spell.

I think it's better to leave it as it is. The main purpose I see in these 'growth' spells is to provide supplies to campaigning armies, and the supplies you get from a province is strongly correlated to its growth scale. Moving your troops to a province that hosts a Well of Pestilence, and lacking Bags of Wine? Cast, and voilà!