Better to borrow, buy or snitch by the light of the moon some of your neighbor's if you want any for future years. The Rhubarb Compendium ( yes, there are such publications) says "...During the first year of planting, the stalks should not be picked, since food from the leaves is needed to nourish the roots for the next year's growth. One light picking may be taken during the year following planting if the plants are vigorous, and beginning the second year following planting, the entire plant may be harvested..." Concordia res parvae crescent seems appropriate at this point...