Comment 13 for bug 1348800

Interesting - we are not married to the current model. The prior model was a table for each tree type that contained growth probabilities for all soil types - with the one world merge that makes too many values - too hard to maintain.

A new model was introduced that only uses 4 parameters per immovable and 3 per terrain and matches them. We can change the model, add parameters and what not, but we will need an idea to model this. Still, I would prefer some more experiments with the parameters before jumping ship on the model since it is cheaper than changing the implementation of the model.