Echinopsis terscheckii – Faster than a Saguaro, mature (i.e. blooming age) much younger, but really just as impressive, it’s the Cardon Grande from Argentina.
These used to be classified as Trichocereus, but then all the tricho’s as well as the lobivias, and more all got moved into Echinopsis. I wonder how long that will last?
I’ll update you when the bud opens, maybe even post a photo of the bloom. Actually, I think it’s pretty much guaranteed I’ll be photographing the bloom and posting it on the blog.