Anybody growing Chokeberries?

Last summer i bought 4 chokeberry plants/bushes from Wilkinsons ,they were selling them off for 50p each.Well i nutured them for a while and they put on some decent growth and i planted them out in autumn.At the moment they are doing very well,but no sign of flower,which should appear in May.Does anybody grow these and if so when could i expect them to fruit,obviously not this year.But they do look really healthy.

Fraid not Peapod,these are shiny black berries,very bitter but fantastic as a juice.Apparently this is the fruit with more antioxidants than cranberry or blueberry.The bush has a somewhat waxy leaf,the plant is native to eastern  north america.

Thanks guys, will keep an eye out