Notocactus uebelmannianus 

Notocactus uebelmannianus is a globular cactus with a shiny deep green skin like a tomato. Spines are appressed (re-curving toward body). One of the few cacti with rich royal purple flowers. Flowers to 3" in diameter. 

• Light:  Filtered Sunlight – This plant needs bright, filtered light with ample airflow so place in front of a window.
• Water:  Not Thirsty – This plant can go several weeks without water so only water it when the soil completely dries out.  
• Tip: This plant needs porous soil with adequate drainage.