Necrobotany is such a cool idea like:
- druidic nature magic + necromancy
- undead skeletons being supported by plant fibers to make up for missing muscles and ligaments so they can run instead of shamble
- turning said skeletons into multi limbed monstrosities with vine arms
- or piecing together bones and limbs with vines to make fleshier monsters
- adding thorns or huge venus fly traps or poison onto minions
- undead exploding into petals and leaves like a smokescreen, or infecting opponents with disease from pollen
- suffocating opponents from the stench of rotten minions and corpse flowers