Hello, my rhubarb crowns (2 years old) haven't produced any leaves at all. The crowns are visible and haven't changed i.e. not rotted or disappeared or anything and I wondered what the reason for lack of leaves and stalks might be. I did have to move the rhubarb plants last autumn. The winter was quite mild and I read somewhere rhubarb needs a number of weeks at three degrees or below, I don't think they would have had this last winter. Thank for any help.