Rhizomes, horizontal underground stems, enable certain plants to survive from one growing season to the next and in some species they also serve to propagate the plant vegetatively. They may be thin and wiry, as in couch grass, or fleshy and swollen, as in Iris. Compact upright underground stems, as in rhubarb, strawberry, and primrose, are often called rootstocks.
Developing the image of a rhizome refers to the creative process as an inexplicable energy, which sends new life above ground out into the world. The process resembles some plant's threadlike tendrils reaching out in all directions. Creativity is quiet and powerful with hidden chaotic structures.