Redroot Pigweed is an example of which type of plant?

Redroot Pigweed (Amaranthus retroflexus) is correctly identified as an annual plant. Annual plants complete their entire life cycle—from germination to seed production—within one growing season. This characteristic includes the establishment of the plant, flowering, and then dying off, which is exactly what Redroot Pigweed does.

Classifying Redroot Pigweed as an annual means it germinates from seed, grows, flowers, and produces seeds within a single year. Knowing that it can germinate in the spring and produce new seeds by summer reinforces its classification as an annual.

While the classification of "Annual or Winter Annual" could also be a possible option, the core aspect of Redroot Pigweed is that it is primarily known as an annual plant, aligning with the answer provided. This classification helps in understanding its growth habits and management strategies in agricultural settings, particularly concerning herbicide application and weed control practices.