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I removed the flowers. One areole was lost from two of the cacti plus a few spines. Not too bad. Unfortunately those parts don't grow back in my experience.

Cornholio-straw flowers, but that Noto and the rest of 'em look quite striking, Poly. I know you'll do right by 'em.

1- parodia wernerii

2- melocactus azureus

3-gymnocalycium baldanium

4- parodia ottonis

I didn't know I found a young Melocactus at Home Depot. Once or twice I've seen a few fully grown Melo's with cephalium for sale there. Based on what I've been reading about Melo's I'm thinking they aren't the easiest to grow.

Water in winter, not too cold(arround 10-15 C"), mineral soil with extra bit vermicompost and they'll do ok...