Old chimney pots, drainpipes or buckets with the bottoms knocked out are ideal for forcing yur rhubarb - just keep the light off the stems and make those leaves strain for the sky. My grandfather used that method to grow specimens that would shade a bullock.
I wish I could still eat it - but after said grandfather bet me I couldn't eat seven bowls of rhubarb and custard I was sick as a dog, the world dropped out of my bottom and I haven't been able to stomach it since.