Euphorbia obesa or Gingham Cactus, but it's not really a cactus. It's a succulent. It is wanting me to groom it for next year's Cactus and Succulent Society show. I have had this little guy for about 3 years. The little cyathia on the top are an uninpressive yellow, but I love they way it looks like a hot air balloon. It will grow to about 3-5 inches across. I keep it outside year round on my partly shaded, east patio. Hopefuly now that I have decided I will enter it in next year show-it won't end up like the Melocactus!
Tephrocactus articulatus--Pine Cone Cactus is ready to bloom. It bloomed! The bee in the center of the flower is just loaded with pollen. He rolled around this flower for at least a full minute . This cactus is full grown at 2' x 3' This one is planted in full west sun and is a great Xeriscape cactus. Our wet winter has this cactus bursting with blooms--the most ever! My potted one hasn't even started to bloom. This one is about 4 years old. It can get larger, but the segments usually fall off. If left in place, the segments will root.