I feel all asteroid grows trees and seedlings at same speed.
This translate to some asteroid spawning strong seedlings
become extremely useful for human players in current single mode.
Growth Power
If we can attribute different growth speed for each asteroid,
we can nerf down the human advantage and force player to
use strong seedlings more carefully.
New Situation
Also, we can create situation like
-an asteroid which create lots of small and weak seedlings veryquickly.
-an asteroid which create very big and powerful seedlings but with
limited frequence.
