cactus flower

Last night I was walking by my cactus garden and I saw a big yellow blob which I thought was a piece of garbage and it's a FLOWER. It's one of the extremely hardy cactus I got from Bert. It's not even buried or anything, it's a cut piece lying on the ground. (When you do that, the spines magically turn into roots--I didn't believe it until I saw it with the ones I got from Miss Beth.) I was so stupidly excited. I feel like it's a message--but from who? About what?
I wonder what day it grew? Tuesday was 7 Ahau/Xochitl (Flower). ....hmm...
I will post a picture later.