Gardenfanatic. ----They were sown in about March/April can't be too sure of month but it was springtime, from a free packet of seed we had had some time. We didn't know if they would germinate being fairly old seed, but they came up like grass, no problem at all. You can buy the seed from just about any seed company. I can't tell you the variety, sorry. You can also take cuttings but as I have never tried I can't help you there. No doubt some one on the forum will tell you when and how.
Best of luck.
Chris.
PS--most of the diascias are treated as half hardy annuals, but will overwinter if kept in a sheltered/frost free place. We have to take them into the greenhouse if we want to keep them, them it's touch and go. I have kept a white one for my hanging basket for several years, hope to do the same with these from this years sowing.