Since I have no idea, I don't think these are silly questions, Grand_Mada ... 

But I can't help you, sorry, because I have no idea ... 

mada and her rhubarbe    

here mada, i found some lecture for you: http://www.rhubarbinfo.com/growing

Have a good day

and even when you know the answer you can still ask....just to make sure that others know it too

and then its easy to show off when they don't

I haven't read Kye's link yet. But my Dad always had rhubarb. I'll be talking to him later today I'll ask for you Mada. I do remember that he would alternate which stools were forced, never using the same one as last year, I believe he let a stool rest for a full year if it had been forced,    So if you have three stools, you would have one in use over current summer, one which had been forced that spring and was resting and the last one would be resting from the previous years forcing.  He used straw or loose layers of newspaper to cover the forced pot at night if frost was forecast. He knocked a  bottom from a large terracotta type pot for tall stems and would cover it with a straw basket held up from the plant with sticks from the garden. 
Hope this helps. It's from memory as I said. I'll check later this evening when we have a chat.