Thank you. From the wiki page, I can't tell if that's Broccoflower is the result of cross-pollination as would happen naturally or the result of direct human intervention - I also can't tell if the seeds from Broccoflower are viable - I'll Google around more and learn :-)

As for overlooking - you're right, I did and should have thought of that before commenting. After a few attempts at saving seeds it became obvious to me that buying them each season was preferable.