Cactus plants are great for someone who loves the unusual and has a bit of a green thumb. Cacti take a little bit more care with watering. Generally, cactus plants will need watering every 7 to 10 days for optimal growth during spring, summer, and autumn months. Increase the interval between watering schedules during the plant's rest or dormant period during winter (approximately every 4 to 6 weeks). With this guy under watering is better than over watering. Pot will vary from picture.