Top: pollinated. Bottom, not.
You can tell by color and how plump the top one is behind the flower. Also, unpollinated flowers will fall off. I’m not a botanist so I can’t tell you what the parts of the flower are called.
I read that this cactus was not self-fertile but brushing the flowers together has produced fruit. It doesn’t mean the seed is viable but I will try down the line.
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I’ve had them start to make fruit before, but they have all self-aborted before they got much further than what you have pictured.
