Water regularly, especially during establishment and dry periods. Allow the soil to dry out slightly between waterings to prevent waterlogging. Once established, it exhibits good drought tolerance.

Aim for consistently moist soil without being saturated for optimal growth and flowering.

Pruning is typically not necessary for this species. Deadheading spent flowers can prevent unwanted self-seeding if the plant is considered invasive in your area.

If the plant becomes leggy or untidy, light trimming can be done after flowering to maintain shape.

Propagates readily from seed. Sow seeds directly in the garden in early spring or autumn, as they benefit from a period of cold stratification.

Seedlings can be transplanted carefully if needed, but they transplant best when young.

Repotting is generally not applicable as Sisymbrium altissimum is an annual or biennial plant that typically grows from seed and completes its life cycle within one to two years. It is best sown directly into its final location.