Strictly speaking, an annual plant is one that completes its growing cycle (grows from seed, flowers and produces seed) in the course of a single growing season.
(an annual plant; is; one that completes its growing cycle (grows from seed, flowers and produces seed) in the course of a single growing season) (one that completes its growing cycle; grows; from seed, flowers and produces seed; T:in the course of a single growing season)
an annual plant one that completes its growing cycle
is grows
one that completes its growing cycle (grows from seed, flowers and produces seed) in the course of a single growing season
from seed, flowers and produces seed T:in the course of a single growing season