I don't think it's a hoodia and time will tell when you get it's first bloom. 1000's of Huernias' and no way to tell them apart even with a bloom. Size, number of rolls of spines, color, etc. Hoodias are rare and more costly and is seldom sold in the stores. They are much larger growing except when small newly purchased. Look up Hoodia on the web to get an idea.
Stush
