Flowering usually occurs from May to October, but it can occur earlier in warm locations. Flower stalks are triangular in cross section and 2 to 8 inches in length. Directly below the flower is a group of three leaves that radiate out from the stalk. There are 30 to 75 spikelets within each flower and each one is capable of producing one seed. A mature plant can produce over 100 flowers within a growing season and up to 5,000 seeds.
Seed germination occurs at or very near the soil surface.
Germination continues throughout the summer. Seedling growth is slow initially and plants may require several weeks to become established. Once established, green kyllinga forms a vigorous system of rhizomes. In turf it forms a weak sod that gives poor footing for athletic fields and golf courses. Although green kyllinga is most often a problem in bermudagrass, it has been found in cool season turf species as well.