Flower stalk as of July 1, from the inside of the greenhouse, and from the outdoors
As it turns out, the CBG has a time lapse video of the Agave in action:
I'm not sure when I will be making a my next trip to the Gardens, so there is a possibility that I might miss the fully open flowers. So, I thought I'd share some pictures of another blooming Agave species in the greenhouse, with open flowers on the lower part of its stalk.
Agave macrocantha plant and flower stalk, well contained inside the greenhouse. The CBG has quite a few Agaves; if they had to cut open the roof every time one bloomed, they'd be in big trouble.