Oregon Agriculture Herbicide Practice Exam 2025 - Free Herbicide Certification Practice Questions and Study Guide

The bent tip of the seed leaf in onions signifies the flag stage of growth. In this stage, the seed leaf, also known as the cotyledon, exhibits its most distinctive characteristic—bending or curling at the tip. This morphological change is an important marker in the development of onion plants, indicating that they are moving toward maturation.

During the flag stage, the plant is preparing for the next phase of its life cycle, which includes the formation of true leaves and eventually flowering. Recognizing the flag stage is vital for growers, as it helps them assess the appropriate timing for management practices such as irrigation and fertilization to optimize onion yield.

The other stages mentioned, such as rosette, tillering, and jointing, do not feature the bent tip of the seed leaf, indicating different growth phases in the plant's development. Each of these stages has its unique environmental and growth conditions that are critical for determining the overall health and productive capacity of the onion crop.