Astilbe bare root - which way up to plant ?

Bought some bare root Astilbe Red Baron which arrived today. Thought I'd pot them up before planting outside when spring arrives. Trouble is I can't work out which way up, what do you think?




Second photo has a flat bit where it must have been chopped off from the mother plant, so I suppose that is the bottom?

 

Thanks Mazambo, my photos are a bit blurred but I think you may be right.

 

Only 4 days after putting in a poly bag with damp compost and they have started shooting already.

So now it's obvious that my cuttings are vertical slices off a main root, I thought the flat sides were the top/bottom

 

Looking good, John!!