What season do summer annual plants typically complete their life cycle?

Summer annual plants are characterized by their growth cycle, which typically begins with germination in the spring when temperatures become warm enough for optimal growth. These plants grow rapidly throughout the summer, taking full advantage of the longer days and warmer weather. By early fall, they complete their life cycle, which includes flowering and producing seeds.

The life cycle of summer annuals ends in the summer or early fall, making it the correct answer. Other seasons do not align with the completion of their growth cycle; winter is too cold for their growth, while spring is when they begin germinating and growing. Fall, while it is when they finish their cycle, is generally considered to be part of late summer in this context, as the majority of their life cycle is completed by the end of summer.