emmg

you're probably missing some meshes and textures. i don't play skyrim anymore, i've no idea if smim affects the flora, but you could try manually copying the data files from the mod (smim or verdant, any other mod you might think is changing bushes or such) onto your game data folder. if they're packed in a .bsa, you could try unpacking it (bsa unpacker is there on nexus) and then adding the files. NMM is acting a little wonky for me recently, installing only half or none of the files, maybe that's what happened here too. good luck.