I'm currently working on crossbreeding (specifically for Terra Wart), and the Tekkit Wiki suggests crossbreeding in darkness to prevent unwanted crossbreeds from growing. So I carved out a basement under my base with no windows or light sources, and the crops grew, but of course, a butt load of zombies spawned in the room and trampled all my crops.
Does anyone know a good way to crossbreed in darkness without hostile mobs spawning and ruining the crops/potentially breaking down the door and infiltrating my house? This might be a really noobish question, but I am a noob, so the help of more experienced players would be much appreciated. :3