TL;DR
It is currently very hard to place a full agricultural tower worth of overgrowth yumako soil, as the blue marsh terrain type shows up a lot in green territory. I would like that blue marsh (which also appears outside green area) to be replaced by green marsh.Why?
Overgrowth Yumako soil is way harder to use than overgrowth jellynut soil due to all the blue marsh tiles in yumako area. In both areas, there is some deadskin and other mold that blocks placement, which is sufficiently spread out to avoid. But in yumako area, you have the very fertile looking blue marsh ground, which blocks overgrowth yumako soil.Making overgrowth yumako soil placable on blue marsh is not a good fix, as there is a lot of blue marsh outside of green areas and that would make overgrowth yumako soil to powerful.