Place your cactus near a window that gets bright but indirect light. Do not place it directly in the hot sun. Most potted cacti were either raised indoors or in a greenhouse and can sunburn, according to information published by Texas A&M University. In addition, the straw flowers fade in the sun. If you want to set your cactus outside, place it in a location that receives partial shade and gradually move it into a sunnier location.
Feed your cactus soon after you bring it home. Potted plants need a dose of nutrients added to the soil now and then. Once every six months use a water-soluble, slow-release fertilizer formulated for cacti and succulents. Alternatively, give the cactus a low dose of 5-10-5 fertilizer once in the spring, summer and again in the fall.
Water your cactus when the soil dries out. Cacti are drought-tolerant plants and can be left without water for several weeks. In general, water once a month, or when a stick inserted to the bottom of the pot is still dry when pulled out.