Abstract: Studies were carried out in a screen house, in a compound off Arthur Eze Avenue, Awka, Anambra State, using germinated seeds in five polythene bags to determine the life cycle characteristics, and the seeding potential of Vernonia cinerea (Linn.) Less. Results of the vegetative growth studies showed that V. cinerea had a mean height of 103.8 ± 34.4 cm, the mean number of leaves per plant was 301 ± 133, the mean number of branches of stem was 19 ± 3 and the mean life cycle duration was 28 ± 2 weeks. Results of the studies on the reproductive potential of V. cinerea showed that the mean number of buds per plant was 1,050 ± 883, the mean number of seeds per capitulum was approximately 21 ± 0.6, and the mean number of seeds per plant was 21,774 ± 18,740. The phenological observations of V. cinerea showed that the vegetative phase lasted for 8 weeks before the appearance of the flower buds which marked the beginning of the reproductive phase, while the reproductive phase of V. cinerea lasted for 20 weeks, from the appearance of flower buds to the time the plant withered. It is concluded from the result that V. cinerea has the ability to flower and fruit within a period of 5 months, with life cycle duration of approximately 7 months. And that the high seed production potential of V. cinerea will help it survive competition in areas where it occurs.