Water regularly to keep the soil consistently moist, especially during dry periods and establishment. Avoid waterlogging, as this can lead to root rot. Once established, Bidens bipinnata can tolerate short periods of drought, but best growth and flowering occur with adequate, consistent moisture.

Pruning for Bidens bipinnata is largely optional, primarily serving to manage its size or prevent prolific self-seeding. Deadheading spent flowers can improve the plant's appearance and reduce the number of seeds dispersed, which is useful if you want to limit its spread. Light trimming can also encourage a bushier growth habit if desired.

Bidens bipinnata is most commonly propagated by seeds, which it produces abundantly. Seeds can be directly sown outdoors in spring after the last frost, or in late summer for a fall display. For successful germination, lightly press the seeds onto the soil surface, as they require light to sprout. Ensure consistent moisture until seedlings are established.

As an annual plant, Bidens bipinnata does not require repotting in the traditional sense, as it completes its life cycle within one growing season. If seeds are started indoors, seedlings should be transplanted to their final outdoor location in the garden or a larger container once they have developed a few true leaves and all danger of frost has passed.