What's interesting is the roots look ok. It's just the interior which rotted out. Thanks Aiko, looks like that's it. Anyone have thoughts on a soil mix for this type?

Further cutting on the base... looks bad. I think I saved the top piece just in time!

Yes, the bottom is flat. Not sure on the id of the cactus.

It was planted very deep, almost no room for roots. There were a couple squishy spots so I cut the top off, now it'll sit to dry.

Will be digging it out today, agreed on the soil. It's what it came with, I should have changed it out. The dish under is just something I set it on to keep the counter clean, the pot had lots of holes in the bottom.

My previous cuttings never did take, but one I did this summer finally did! Will have to repot to a better mix soon. I've read myrtillocactus could use a bit more organic than some types?

I've had this since this summer, unsure of species. Whatever happened moved quickly. I can't figure out if it was too much water or too little. I try to be sparing and only water when dry. It was watered not long ago, think it was ok then. I was thinking of removing the soil and looking at the roots...

Possibly, I'll get some better pictures of it soon. The piece growing on top has gotten larger.

I'm still wondering about two and three, any thoughts?

They're just being lazy so far then.

Good point about the flowers, I'm a beekeeper so I'm always careful about that.

I have a small prickly pear that has scale. I've been carefully removing them, but they come back. My understanding is a systemic pesticide is needed. What should I use on it?

Does it need a certain temperature range to root?

Your cutting looks just like mine. Still nothing yet, being patient...

Another update, the tops of some of the arms are doing this: Is this going to be multiple branches or just one?