The zooids are in groups of four to eight pairs spiralling round the stolon. Grasses that propagate by an above-ground stolon (runner) can cover a plaque very quickly. Its hydroid form grows as feathery stems resembling seaweed from a basal stolon. New colonies can be formed asexually by breakage of the stolon. Some species have the polyps budding directly off the stolon which roots the colony. It has a basal stolon growing in close proximity with the substrate. Harvesting the stolon is done by manual labour, too. The common fig tree also sprouts from the root and stolon tissues. In many weeks, cobra plants will protrude from each section of stolon. It has sky-blue starry flowers, and can spread by underground stolon. The plant spreads either by stolon or seed, making it exceptionally difficult to eradicate. Mother and daughter plants are connected by a short stolon, forming dense mats. Reproduction in artificial environments can be accomplished by stolon division or from side shoots. Stolon based reproduction is thought to have been used by Rangeomorphs in the Ediacaran age. The stolon is ready to harvest two to three months after planting.