Multiple choice If the weak stem grows horizontally on the surface of the soil, it is called stolon twiner sucker runner Reveal answer Fill a bubble to check yourself D Correct answer Explanation A runner is a weak stem that grows horizontally on the soil surface, producing new plants at nodes (e.g., grass, strawberry). Stolons are similar but grow above ground. Twiners climb by coiling around supports. Suckers grow from the base.