Sisymbrium nepalense prefers consistently moist soil but can tolerate short dry spells. Water thoroughly when the top 2-3 cm of soil feels dry. Avoid waterlogging, which can lead to root rot.

Reduce watering during cooler winter months when the plant's growth slows.

Prune Sisymbrium nepalense after flowering to maintain a tidy shape and prevent excessive self-seeding. Remove spent flower stalks and any dead or damaged stems. Light trimming can encourage bushier growth.

Heavy pruning is generally not required unless reshaping a particularly overgrown specimen.

Sisymbrium nepalense is easily propagated from seed. Sow seeds directly outdoors in spring or autumn in well-drained soil. Seeds germinate readily with light and moisture.

It can also be propagated by stem cuttings taken in late spring or early summer and rooted in moist soil.

Repot Sisymbrium nepalense when it becomes root-bound, typically every 1-2 years. Choose a pot that is slightly larger than the current one with good drainage. Use a well-draining potting mix, such as a sandy loam.

Repot in spring before active growth begins.