|This cactus prefers moist, humid conditions and when grown as a houseplant, loves to be misted daily during the summer. At the onset of winter, do not water, but mist only when days warm or if your home dries out easily. Uebelmannia has a rounded, spherical form, often with vertical ridges. Areoles are set closely and bear 6 to 8 slightly curved spines. Summer flowers are yellow and funnel-shaped.