I've no idea, it was there when I took over the plot, I know zilch about rhubarb, but we had enough for a rhubarb crumble about once a fortnight last summer from it. I noticed last year that it was much later to get going than some of those on other plots, it only emerged from the ground a couple of weeks ago this year. One plot has got one about the size of a Smart car!
Home again now, but will try and go back again later. I have replanted one of my beds of onion sets, they weren't doing very well as the surface of the ground was too dry/hard, and weeds were taking over, so I lifted them, weeded and then put each one back in a little nest of compost and soil mix. Plan to do the other one this afternoon, although a lot of them are doing better. I also need to get the strimmer up there and attend to my edges and paths.
I found a mother and baby slow-worm in my compost bin, very cute!