They are the progeny of Dave Young (in the pic) secretary of Dunedin Hort Soc. He loves bright colours. He had these at the annual Rhododendron day sale on late October, to be used on the tables at which the DHS serves afternoon teas to the sale visitors (all proceeds going to Friends of the Bot Gardens). I and many others admired them, so last Saturday Dave turned up at the Market which I manage and presented me with a packet of seed. I could probably squeeze out a few more if you'd like them.
Incidentally, all your recent seeds are now up, or rather some in each pot. Remind me please of the name of the Dahlia? I can't find THAT thread. 2 seeds are up.