To propagate Hermannia muricata, make stem cuttings. Remove all flower buds and most of the leaves, leaving one or two leaves on the top of the cutting. The cutting should have 3 or more nodes along the stem and be cut below the bottom node and above the top node. Dip the bottom node of the cutting in a suitable rooting hormone and strike the cuttings in a tray with a 1:1 mix of sifted bark and perlite.

Place the cuttings on a heated bench with overhead misting. While waiting for the cuttings to root, the rooting medium needs to be kept moist but not overwatered and the leaves should have a fine film of water on the upper surface to help reduce moisture loss. After three to four weeks, once the cuttings have rooted, remove them from the misting bench and place them in a semi-shaded area where they will harden off for a week or two. While hardening off, they will need to be watered a couple of times a day but it depends on the moisture of the medium. After hardening off, pot the cuttings into an appropriate sized pot or bag in a potting medium, and allow them to grow until they are a suitable size to be planted into the garden. Place the newly potted plants in a sunny area and water them daily or every 2 days, depending on their needs.

Once large enough and well rooted enough, Hermannia muricata can be planted into a sunny spot in the garden. It will do well in rockeries or mixed border plantings.