Comment 15 for bug 1348800

>A weighted choice could be implemented of course, but I think tweaking the parameters is better.

In the terrain my test map happened, the best tree had a suitability of 91%, 6th-best 25%. I think that a forester mostly plants the well-growing trees and only occasionally the alternatives makes sense, and made a naive trial implementation, and liked the outcome.

If you wish, I can fix the codecheck introduced complains etc., and push for review.

However, this bug is not fixed by introducing weights to plantation.