In trees, carbohydrates produced in photosynthesizing leaves are transported to
roots and other sink organs over distances of up to 100 m inside a specialized transport tissue, the phloem. Carbohydrate translocation in the phloem is a fundamental aspect of tree physiology with relevance for tree crop performance and climate change. In this paper, we present theoretical and experimental data on the carbohydrate transport speed inside the phloem.