Pour the liquid into your jars or cups, making sure you get some of the undissolved crystals into every jar or cup. These will help to seed your garden, giving your crystals a place to start growing. If you'd like to color them, add a drop or two of food coloring or liquid watercolor to your jars and give them a stir. Place your jars of crystal liquid into the freezer for 10 minutes. Then move them to the refrigerator and leave them undisturbed overnight.