Water Pentanema asperum thoroughly when the top inch of soil feels dry. Avoid overwatering, as this can lead to root rot.

Reduce watering frequency during the dormant winter months, allowing the soil to dry out more between waterings. Ensure good drainage to prevent waterlogging.

Prune Pentanema asperum in late winter or early spring before new growth begins. Remove any dead, damaged, or crossing stems to maintain a tidy shape and promote healthy air circulation.

Lightly trim back to encourage bushier growth. Deadhead spent flowers to encourage further blooming.

Propagate Pentanema asperum from seed sown in spring, or by division of established clumps in early spring or autumn. Seeds can be sown in a well-draining seed-starting mix and kept moist.

Division involves carefully separating the root ball into smaller sections, each with roots and shoots.

Repot Pentanema asperum every 2-3 years, or when the plant becomes root-bound. Choose a pot that is slightly larger than the current one. Repot in spring, using a well-draining potting mix.

Water lightly after repotting to help the soil settle around the roots.