Flora spread: Re-enable dry shrub replacing flora in desert sand
Flora spread: Re-enable dry shrub replacing flora in desert sand

Flora is converted to dry shrub in desert sand and silver sand.
No conversion in sand to preserve sand dune grasses.
Dry shrubs do not spread so this conversion, used by players, is the
only way to generate them.

evrooije/beerarchy,evrooije/beerarchy,evrooije/beerarchy