Potting Mix for cuttings

Sorry to hijack your thread Scarlet and shoot off on a tangent(not like me!!) but................

I've just purchased these as part of my seed order.

https://www.ebay.co.uk/itm/Dahlia-Cactus...2749.l2649

Have you ever grown them from seed with much success 

I've tried Bishop's Children, Pompom mix, Redskins, all produce nice flowers and some worthy of keeping tubers for the following year.  Not the greatest picture but this was a bed of Redskins at the front and Pompoms at the back. They were hit really hard by the late frost we had last spring to the point where they blackened and I thought most would die but they all managed to pull through