This air plant kit comes complete with ONE air plant and 600g of coloured sand ready to place inside the glass bowl. The fishbowl measures approx. 14.5cm diameter; 12cm high. Tillandsias do not need soil in order to live. They absorb nutrients from the air. They do like to be sprayed or soaked in water every one to two weeks, however. Use rainwater or filtered water where possible. You can also purchase a Tillandsia fertiliser spray to provide added nutrients, if you wish.