Water Vernonia andohii moderately during the growing season, allowing the soil to dry slightly between waterings. Reduce watering significantly in winter, providing just enough to prevent complete desiccation.

Ensure good drainage to avoid root rot, as this species prefers to be on the drier side.

Prune Vernonia andohii after flowering to maintain a desirable shape and encourage bushier growth. Remove any dead, damaged, or crossing stems at any time of the year.

Light pruning can also be done in early spring before new growth emerges.

Propagate Vernonia andohii from seed sown in spring under glass, or from semi-hardwood cuttings taken in summer. Seeds may require stratification.

Cuttings should be treated with rooting hormone and kept in a warm, humid environment until established.

Repot Vernonia andohii every 2-3 years in spring, or when the plant becomes root-bound. Use a well-draining, gritty compost mix.

Choose a pot that is only slightly larger than the previous one to avoid waterlogging and encourage healthier root development.