How to force your rhubarb into growing like a rocket. Cover your rhubarb crowns over with a bin (or a posh forcing jar) to exclude the light. This is called forcing in the gardening world. Forcing rhubarb stimulates the rhubarb plant into early growth. In a few weeks time you’ll have a much earlier crop of rhubarb than if you had left your rhubarb uncovered. Also these early stems will be pinker and sweeter. Because the rhubarb stems are sweeter you will need to add less sugar to your rhubarb cr