This activity gives instructions for growing salt crystals that can be nurtured to grow in many different directions and shapes. When you add salt to water, the crystals dissolve and the salt goes into solution. When as much salt has been dissolved into a solution as possible, the solution is said to be saturated. But when the salt water begins to cool, there is more salt in solution than is normally possible. The solution is said to be supersaturated. Supersaturation is an unstable state. The salt molecules will begin to crystallize back into a solid at the least provocation.