Click to view a larger image You may not be an actual scientist, but this magical kit will sure make you feel like one. Watch crystals cluster and grow right before your eyes. Kit includes everything you need to grow your own desktop-sized crystal cactus including the growing pot, magic powder, container and lid. Your Magicactus crystals will last for several months to several years, depending on the humidity of your environment. To preserve longer, store or display them in an airtight container. Suitable for those 14 years and older.