Depends upon which Crinum you plant, though. Some don't get all that large and might do fine in a pot. I had a clump, I forget which one now sorry, that had about 2ft. high foliage and the flower spike was maybe 30in. White lily shaped flowers, very fragrant lasted about 2 or 3 days.
The ones you see in public gardens here grow to the size of a Volkswagen, pretty quickly though. They have clumps of smaller spidery flowers on very tall stems, so the flowers bloom in succession for a while. They're gorgeous, but too big for a small garden.
I stopped growing them, frankly, because although they're ok foliage plants, and the flowers are nice and fragrant, they (flowers) don't last long enough to make it a worthwhile endeavor.
