Back at the Arizona Garden again--yay!

I had the pleasure of introducing a friend to Stanford's Arizona Garden today.  No matter how many times I go there, I always see something new.  Here are a few photos I snapped!

Finally, I checked on the huge agave blue glow that I've taken pics of before.  But this time, I noticed that there are pups growing out from the middle of the agave.  I've never seen this growth pattern in the absence of coring.  What's going on?  Other blue glows I've seen pup out (if at all) from the sides, not the middle.