Pith: The Main with the trunk and the key source of nourishment to the young plant. Pith, often known as medulla, constitutes a comfortable, porous tissue inside the stems of vascular vegetation. It's comprised of fragile cells referred to as parenchyma, which serve to retail store and Express nutrients. Heartwood: https://succeedinlife.co.uk/the-ultimate-guide-to-choosing-the-best-cat-tree-scratcher/