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You can't make it do what it doesn't want to do..........
Any type of 'forcing' will weaken a crown. The only reason to do it is to get an earlier crop at the expense of using up the stored energy in the crown. I was originally done in areas where they grew thousands of crowns so they could use a proportion for forcing each year (to extend the season - ie for making money!) which, when exhausted, would be replanted and left to grow for a few years to build-up the crown again while being cropped normally. Unless you have several rhubarb plants growing I think forcing is a waste of time for the home gardener.
Are we talking about 'proper' forcing, i.e. digging up the crown and exposing the root to frost, then taking it into a warm darkened shed to produce pink rhubarb?
are we talking about placing a forcing pot or chimney/bucket over a crown of rhubarb growing in the garden to blanch the rhubarb which is produced only a short while earlier than normal?
I do the second every year with a mature crown, but I don't pull any rhubarb after the end of May/early June - this way the crown builds up again before the winter and is not damaged.
I was assuming the former Dove. I think what you do is quite a common method of keeping it tender and, as you say, getting a slightly earlier crop.
I agree Bob, but this implies differently http://www.gardenersworld.com/how-to/projects/fruit-and-vegetables/how-to-force-rhubarb/276.html
whereas this site gives information on what you and I would call Rhubarb Forcing http://www.rhubarbinfo.com/forcing.