<fertilityFactorGrowthRate> is multiplicative or additive?

[nmid]

I'm trying to adjust the growth rate of flowers, wild plants, regular crops and oak trees.. and I was just a bit confused about the <fertilityFactorGrowthRate>.

Is there anywhere I can see the complete formula of everything that affects the growth rate?

[iame6162013]

i think the only thing that affects this is the dirt and the rich soil and sand

[nmid]

As I understand it, the basic growth rate is decided by the class when you are growing on regular soil,
while the <fertilityFactorGrowthRate> is the additive/multiplicative factor when you use rich soil.

I'm assuming it's an additive factor.