Below-ground plant parts refer to the parts of a plant that are located beneath the surface of the soil. This includes ROOTS, which are the most important part of a plant as they absorb water and nutrients from the soil. ROOTS also anchor the plant in the ground and provide support for the stem and leaves. Other below-ground plant parts include rhizomes, tubers, and bulbs. Rhizomes are underground stems that can spread horizontally and produce new plants. Tubers are thickened underground stems that store food and energy for the plant. Bulbs are modified underground stems that contain stored food and energy and can produce new plants.