Water moderately when the top 2-3 cm of soil feels dry. Avoid overwatering, as Black Henbane is susceptible to root rot. Ensure good drainage to prevent waterlogging.

Reduce watering in cooler months when the plant's growth slows down.

Pruning is generally not required for Black Henbane, as it is often grown as an annual or biennial. If desired for aesthetic reasons or to manage size, prune lightly after flowering to encourage bushier growth.

Remove dead or damaged foliage as needed.

Propagate Black Henbane from seeds sown directly outdoors in early spring after the last frost, or start indoors 6-8 weeks prior. Seeds require light to germinate, so sow them on the surface of the soil.

They can also be propagated by cuttings taken in spring.

Repotting is typically unnecessary for Black Henbane, especially if grown as an annual. If grown as a perennial in a pot, repot in spring every 1-2 years into a slightly larger container with fresh, well-draining soil.

Ensure the new pot has adequate drainage holes.