|Gladiolus gandavensis 'Boone'|
In any event, I got this glad many years ago from Heronswood. I notice that Plant Delights still offers it, but they call it Gladiolus dalenii 'Boone', rather that G. gandavensis 'Boone'. That may be the proper name for all I know. The blurb in their catalog notes that it multiplies obscenely fast so that you will have plenty to share. Well said!
As I said, this glad seeds itself all over the garden and it grows almost everywhere except deep dark shade. It is an easy plant and is supposed to be hardy to zone 6 at least.
Since I have taken up photography, my standards for what plants I want in the garden have changed somewhat. As applied to this glad, this means that it has received a stay of execution since I like to photograph it.