Cut it first. Put the cutting into a pan of water and boil it for about 5 or 10 minutes. Basically forcing the air out of the pores and letting the water in. Take it out of the water with tongs and go to the shop, wrap the wood around a 3# coffee can or something even larger diameter CAREFULLY and either wrap tape or a very large rubber band around the wood forcing it into a curve. Holding it in the curve around the can, let it dry for a day or two (at least overnight) so that the water gets out and air gets back in, and release the tape or rubber band and it will hold a curve. It may spring out to a larger radius but, it will be close. Maybe one of the wifes sauce pans or something larger would be better than a coffee can.
There are areas that look prone to cracking but the softer the wood (think pine) the easier it will be to make it curve.
Hope that helps.
Rog