Dragon fruit cactuses are slow growing cactuses that prefer to climb as they grow. This plant is sold at about 2 cm (2″) tall but can grow endlessly.
Simply water it when the soil around the plants is dry down to 5 cm (2″), which is about every 1-2 weeks. They grow best in direct sunlight but can also grow with artificial light.
Note: this plant might not produce fruit. Sold in plastic cups, pots not included.