Dahlia propagation

I haven't had any success with cuttings either. I tend to just prise them apart in spring or chop through a big tuber with a spade. They're surprisingly tough!

Yes, I can often make several plants from one tuber - but these are new ones Ive nought in from Halls of Heddon. I wanted to buy british grown. These are pot tubers so not really big enough to split into half a doezen pieces.