Sorry, no idea. I'm from way down South originally and can't remember a time when we did not have rhubarb growing. I've planted a few rhubarb seeds and planted them out where I live in the sub-tropics and they are starting to spread their wings. I am hoping that although they have a long way to grow, they will end up on my table! Looks like it might be a while. Just keep your eye on any rhubarb you've planted, if you have. What I now get in shops is nothing like the rhubarb I grew up with. I am accustomed to lovely thick stalks, and the shop ones are quite skinny as if .. ? Well, I don't know, unless they are grown in shadehouses and can't reach for the sun, or other. No idea. Google around - harvesting and/or picking rhubarb (au) etc.

- Jane