Water regularly once established, allowing the soil to dry slightly between waterings. Avoid overwatering, as Gomphrena haageana prefers well-drained conditions.

In hot, dry weather, more frequent watering may be necessary. Reduce watering in cooler months.

Deadheading spent flowers encourages continuous blooming and maintains a tidy appearance. Trim back leggy growth in mid-season to promote bushier plants and more flowers. Light pruning can be done to shape the plant.

Easily propagated from seed sown indoors 6-8 weeks before the last frost or directly outdoors after the danger of frost has passed. Seeds germinate readily in warm conditions. Cuttings can also be taken in summer.

Generally, Gomphrena haageana is grown as an annual or in containers that allow for replacement rather than extensive repotting. If grown in pots, repot only when root-bound, typically in spring, using a well-draining potting mix.