Hi & welcome, Sall! TY so much for sharing your anecdotes, much appreciated! The past few days, it seems like Crinums are in every yard I drive by, on my mind I guess. And no doubt, some are blooming, some not. I did look on a few sites that sell bulbs to get a feel for how many diff ones are out there & you're so right - a LOT!
Generally, the ground here is definitely clay, red clay, with a lot of sand. (Clay + sand = concrete!) If one tries to dig a hole in the middle of lawn, it's going to be really tough. Really tough. But, in the spot where the Crinums had been growing for at least the 10 yrs that my friend has owned her house, leaves & pine needles were piled around them over winter, mostly shady. I must admit, it was very easy digging.
...and what a smart plant, pulling itself deeper into the ground. Gotta love that!