QuestionsHow to growVegetable GrowingRhubarbrhubarb withering 0 Vote Up Vote Down carmel dolan asked 16 years ago Rhubarb was growing o.k. Put organic compost around it 2 weeks ago and the leaves are turning yellow and stems are withering 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago There must have been something wrong with the ‘organic compost’ … contamination with weedkiller perhaps, or something else was applied to the rhubarb. Drought can cause yellowing and withering but there has been plenty of rain in recent weeks.Â