The term 'PLANT STEMS' can be broken down into two crossword solutions: STALKS (6 letters) and STEMS (5 letters). Plant stems are the main structural support of a plant, providing stability and allowing for the transport of water and nutrients. STALKS are the stem of a plant that is above ground and supports the leaves, flowers, and fruits. Stems are the part of the plant that is below ground and helps to anchor the plant in the soil.