4 tsp. salt
4 tsp. water
4 tsp. laundry bluing
4 tsp. ammonia
coal

Dissolve together. Pour this mixture over a piece of coal in a saucer. With a medicine dropper, drop a few drops of food coloring over the mixture. Put the garden in a place where it won't be disturbed. In a few hours tiny crystals will begin to form. They will grow for a few days.