Pre packed rhubard roots

I bought 3 Rhubarb plants off our local market for £10 a few weeks back, they're only young plants, but they were in 2lt pots so I think I got a bargain; I have seen them elsewhere at £6 for one plant.

I planted them in well fertilized ground and watered them and they are growing brilliantly. I have no intention of picking from them this year as they are younf plants but I will certainly be keeping them well fed to get them as big and as healthy as possible for next year..