Sow the seed in autumn, in a light, well-draining medium. Cover the seed with a thin layer of sand or fine compost. Seeds that are treated with smoke show improved germination: sowed trays can be subjected to a gaseous smoke-treatment, or the seeds can be soaked in a liquid smoke solution prior to sowing. The seed trays are then watered and moved to a space that provides good light and ventilation. Seeds must not be allowed to dry out completely and should also not be overwatered. Germination takes between 1–2 months and the onset of the first 4 true leaves, is an indication of the readiness of the seedling to be transplanted.

All potted seedlings now get moved to slightly shady areas to allow for hardening off for roughly 3–4 weeks. Thereafter, plants get moved into the full sun. This is also a moment to encourage more vigorous bushy growth, through the pinching out of the growing tips of the young seedlings or rooted cuttings.

Good results are also being yielded through the propagation of cuttings, using tip or semi-hardwood cuttings using fresh material of the current year’s growth. Prepare cuttings of 25–40 mm long, remove about a third of the foliage and cut it below the node. Dip the cuttings in a rooting hormone, firmly position it into ready-made holes with the rooting medium (equal parts fine-milled bark and perlite) and placed in the cutting tray on a mist-unit with heated benches. Rooting of the cuttings will take 9–11 weeks. Rooted cuttings are subsequently moved to a hardening-off section for 2–3 weeks.

Pot the rooted cuttings in to a well-drained soil mix and place in a shady area for 2–4 weeks to harden off and move into full sun, following this period. After the next 7–8 months plants will be ready for planting out in the garden.

The Humansdorp buchu is fine-leaved medium to large shrub, perfectly suited for a mixed fynbos, renosterveld or fragrance garden. The dark green leaves will contrast well with the different shades of brown from some restios or phylicas, the greys of a Helichrysum or Salvia, other varieties of green and some medium to coarse leaf textures.

This species can be grown with companion plants which might include: Thamnochortus cinereus, Caprobrotus edulis, Pelargonium suburbanum, P. peltatum, P. betulinum, Protea cynaroides, Coleonema pulchellum, Metalasia aurea, Dimorphotheca ecklonis, Agathosma capensis, A. mucronulata, A. ovata, Phylica ericoides, Chironia baccifera, Metalasia muricata, Searsia crenata, S. lucida, Passerina corymbosa  and Felicia echinata

Plant Agathosma martiana in a sunny position that drains well at the beginning of the rainy season. This will allow enough time for it to get established in the garden, before the onset of the warmer spring and summer months. Planting can be done fairly close together, allowing for spaces of 20–30 cm, just enough to encourage growth. Buchus prefer denser plantings, as this aid in moisture retention. Generous mulching will further enable moisture retention. Cut plants back very lightly after flowering.