I've seen DEER CAINE and I have used it. When I put it out in the fall, they don't touch it. When I put it out in the spring, they gobble it up. It has to do with the minerals they need for their racks to grow.
Just follow the directions on the package and mix with water first, there is a reason for this, it's important. Then you pour it on the ground. the deer tear the ground up, eating the dirt!