Hi Craig. Actually I did that this year. I kept the tubers in water and they grew, but I sold the growing tuber. I planted them like that and they did fine, so I sold them on into July that way. I actually planted them all the way into September (9 pots planted then), and they all lived. Not sure if that is what you had in mind, but it worked. As long as the tuber is not planted, so that you do not have to dig it up and chance breaking the growing tip, the plants can be planted later in the summer.