QuestionsHow to growVegetable GrowingRhubarbRhubarb 0 Vote Up Vote Down Don Foley asked 8 years ago I have a clear gel like substance on the stalks of my rhubarb. Can you suggest what this might be? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago The gel is sap that has exuded, due to some form of damage usually, sometimes after a burst of rapid growth, which we have had.