Which of the following is not a form of vegetative reproduction of a weed?

Vegetative reproduction refers to methods by which plants propagate through structures that do not involve seeds. In this context, the correct answer is seed, as seeds are a means of sexual reproduction, not vegetative.

Rhizomes, stolons, and tubers are all forms of vegetative reproduction. Rhizomes are underground stems that grow horizontally and can produce new plants at nodes. Stolons, or runners, are stems that grow along the surface of the soil and can root at certain points to produce new plants. Tubers are swollen underground stems that store nutrients and can also give rise to new plants.

In contrast, seeds are formed as part of the reproductive process that involves the fertilization of ovules by pollen, leading to the development of a new plant. Therefore, identifying seeds as not being a form of vegetative reproduction aligns with the definition and examples of vegetative methods. Understanding these different forms of reproduction is important for managing weed populations effectively.