Water regularly, especially during establishment and dry periods. Allow the soil to dry out slightly between waterings. Overwatering can lead to root rot, so ensure good drainage.

Once established, it becomes more drought-tolerant.

Deadhead spent flowers to encourage reblooming and prevent self-seeding. Cut back the plant in late autumn or early spring to remove dead or damaged stems and to manage its size.

This also helps maintain a tidy appearance.

Easily propagated from seeds sown directly outdoors in spring after the last frost, or started indoors a few weeks prior. Division of established clumps in early spring is also an effective method for increasing plant numbers.

Maximilian Sunflower is a large perennial and is not typically repotted. For container-grown plants, repotting would only be necessary if the plant becomes severely root-bound, which is rare given its vigorous growth habit.