Water Montanoa guatemalensis thoroughly when the top 5-8 cm of soil feel dry. Reduce watering in winter to prevent waterlogged roots. Ensure good drainage to avoid root rot.

Avoid overhead watering, which can encourage fungal diseases.

Prune Montanoa guatemalensis after flowering to shape the plant and encourage bushier growth. Remove dead, damaged, or crossing branches. Light pruning can be done in early spring before new growth begins.

Propagate Montanoa guatemalensis from semi-hardwood cuttings taken in late summer or early autumn. Insert cuttings into a well-draining rooting medium. Maintain high humidity and warmth until roots develop.

Repot Montanoa guatemalensis every 2-3 years or when it becomes root-bound. Use a well-draining potting mix. Repot in early spring before new growth emerges.

Choose a pot that is only slightly larger than the current one.