I have an envelope of what is probably Grandpa Ott lying on my desk. I got it as part of a packet of MG seeds from someone on ebay. The packet was SUPPOSED to be 'Kniola's Black Knight" but the flowers look a little bluer than that, so I suspect it Ott (I don't know which made me madder that year that I got a wrong seed, or that that wrong seed was the ONLY seed out of all the ones I bought from the guy that ACTUALLY grew). Not again for me, too hard to control (and remember I'm the guy who regularly handles plants from random Convuvulacae seeds I find in food, so "too difficult to control" is saying something for me.)
BTW for those who have given up on controlling their glories. I have a quick question. How long do your flowers actually keep their colors from generation to generation? I make a point of keeping my eye out for feral MG vines as we drive hither and thither, and I can't help noticing that, while the vines are quite common, in nearly all cases, the actual flowers are always white So either the white kind are unusually adept at living feral or a lot of MG's revert to white after a few generations.