I'm so happy and excited that this plant has decided to flower! :)
It is gorgeous and a bit crazy. Does the name crateriforme come from the inside of the flower?
I have never watched an Argyroderma flower bud develop and I found it very curious how different it is from the usual mesemb flowers I've had so far. Okay, maybe it's not that different but it definitely looks different to me.
The mesemb flower buds I've seen on my windowsill so far were elongated with tips of the petals showing at some point before the flower opens. The Argyroderma bud started as something round and flat, almost looking more like a seed pod than flower bud.
It grew larger and when the sepals parted a bit you could see that the petals are actually curved inwards, folded with their tips toward the "crater".
It stayed like this for a while and then yesterday suddenly it "erupted" and the petals darted out. It stayed like this until today.
It was sunny today and the flower finally opened. I'm so glad I could witness it!