I planted some rhubarb seedlings/shoots out a month or so ago and covered with an old open chimney pot to 'force' it, as was advised. It has grown quite well and has maybe 4 good stalks growing well. However, I have now been told you shouldn't pick any stalks for the first year. Is that right? And if so, do I just leave it (in chimney pot) and let it die back or do I need to do anything? And will leaving it encased in chimney pot stop it spreading/growing (I want lots!)? Advice please!