Obvious what it does, makes you have to spend less time watching a plant grow, more time getting angry at the dealer. When used it should probably decrease the growing time by 5 minutes or so, and can only be used once per plant.
New Stove :
Probably a donator perk, an item buyable from a special NPC that gives you other donator items, like the V.I.P. car dealer. The stove would probably just not explode, I'm tired of making 1 Stim Pack and the stove somehow ignites and sets everything on fire.