4 tbsp. bluing
4 tbsp. ammonia
4 tbsp. water
sponge
brick chips
food coloring
salt

Mix bluing, ammonia and water for solution. In a glass container, place a damp sponge. Soak brick chips, then wipe them off. Remove sponge. Drip food coloring on chips and put them in glass container. Pour solution into glass container over chips. Sprinkle with salt every 1 or 2 days and watch the garden grow.