We had some of those in our back yard, they weren't molded into a hemispherical shape, but they were the same kind of cactus. I didn't discover them until we had lived there 3 or 4 years, since they were hidden in a long rectangular planter buried in the ground. They survived pretty well without any human intervention in Fresno weather. Just a big bulky mass of them, there was no real way to seperate them (the spines are soft and small enough you can sort of handle them if you're careful).
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