I really like the idea behind this mod, but after looking through the code, I'm removing it. As noted in another discussion post (that has not gotten any response I notice), you're overwritting existing defs, which should never be done. You've just copied the biome defs from the base game, with the same defname, and added your plants. This is what patch operations are for. You can add things to defs without effectively destroying the original def. That way when the base game updates, those changes don't get over written by your mod. I notice that some of the new animals are not included in your biome defs, for instance. Any other mods that change the same defs will cause issues as well.

You've also copied abstract defs which are not changed at all from the base game, which is not necessary. You can inherit from those bases just fine. The same issues apply here as above. Your mod should only include your code, meaning the defs for the new plants. Use patch operations to change the graphic paths of existing plants and to add your plants to existing biomes. Why does your mod have a def for rice, when you make no changes to rice? Again, this could prevent other mods that might want to change rice from working correctly, and if the base game changes something about rice, users of your mod won't get that change unless you notice it happened and copy it to your mod.