Water Bidens subalternans regularly to keep the soil consistently moist, especially during dry periods. Avoid waterlogging, as this can lead to root rot.

Allow the top centimeter of soil to dry out slightly between waterings to ensure optimal hydration.

Prune Bidens subalternans to maintain shape and encourage bushier growth. Deadhead spent flowers regularly to promote continuous blooming. Pinch back the tips of young plants to foster a more compact and dense habit.

Prune lightly in late winter or early spring.

Propagate Bidens subalternans from seeds sown in spring or from stem cuttings taken in late spring or early summer. Seeds can be sown directly into the garden after the last frost or started indoors a few weeks prior.

Cuttings root readily in moist, well-draining soil.

Repot Bidens subalternans every one to two years, or when the plant becomes root-bound. Choose a pot that is slightly larger than the current one. Use a well-draining potting mix.

Repot in spring before new growth begins to minimize transplant shock.