Water consistently, especially during establishment and dry periods. Allow the soil to dry slightly between waterings.

Oenothera flava prefers well-drained soil and can tolerate some drought once established, but consistent moisture promotes better blooming.

Deadhead spent flowers regularly to encourage continuous blooming and prevent self-seeding. At the end of the growing season, or after flowering has finished, you can cut back the plant to the ground to tidy it up and prepare for winter dormancy.

Oenothera flava is easily propagated by seed, which can be sown directly outdoors in fall or spring, or started indoors a few weeks before the last frost. It can also be propagated by division of established clumps in spring.

Repotting is generally not necessary for Oenothera flava as it is often grown as an annual or short-lived perennial. If grown in a container, repot when the plant becomes root-bound, typically in spring, using a well-draining potting mix.