The author has never propagated this species from seed and there is no record of it being done at Kirstenbosch NBG. However, should you be able to obtain seed, the propagation-method is fairly easy. Sow the seed in autumn in a light, well-draining medium such as coarse river sand or equal parts of sand and compost. Cover seeds with a thin layer of either bark or sand, and then water. Place the seed tray in a covered area that provides sufficient ventilation and good light. Never allow the medium to dry out completely or be overwatered. Germination can take between 4 and 9 weeks for most buchu species, and the appearance of the first 4 true leaves indicate that the seedlings are ready for pricking out. Handle the fragile, fine roots with care. Place the potted seedlings then in a shady area for about a month to harden them off, before shifting them to the full sun. The young seedlings can also have its growing tips pinched out to encourage a more bushy growth habit. Regularly feed the seedlings with some balanced organic fertilizers.

This species can be propagated by vegetative means, by taking cuttings. Use fresh material of the current year’s growth to take cuttings of between 25 and 55 mm. Remove about a third of the foliage and nip the cuttings below the node. Dip cuttings in a rooting hormone for semi-woody shrubs or perennials and place in trays with a medium consisting of coarse river sand or equal parts of bark and polystyrene, whichever is available. Place the cuttings in a mist-unit with heated benches. Pot the rooted cuttings into a well-drained mix and then transfer it to a shady area for roughly a month, to harden off before moving it into the sun. In another 7–8 months plants are ready for planting out in the garden.

Agathosma dielsiana is best-suited to full sun and well-drained, sandy soil. Planting out is best done in the rainy season between autumn and winter. In areas where there is rainfall throughout the year, gardeners can adjust to their local conditions. In general, planting out during the rainy will enable plants to have a better chance of establishing themselves properly before they have to cope with the harsh, dry conditions in summer. Maintain the planting intervals of 200–300 mm for buchus and this should provide enough space to encourage growth. This relatively dense planting is preferred by buchus, as it aids in retaining soil moisture. Provide a good thorough watering in autumn and winter, depending on the prevailing rainfall following planting. In summer, during the dry season, the irrigation should just be moderate; however, plants must never be allowed to dry out completely. Mulching also helps in keeping the roots and soil cool during the dry periods.

Plant this buchu with other fynbos species, which may include: Agathosma collina, A. apiculata, A. gonaquensis, Acmadenia mundiana, Adenandra gummifera, Acmadenia heterophylla, Euchaetis albertiniana, Coleonema album, Leucospermum muirii, L. patersonii, L. prostratum, Protea compacta, P. repens, P. acaulos, P. coronata, P. cynaroides, P. obtusifolia, Erica baueri subsp. baueri, E. baueri subsp. gouriqua, E. coccinea subsp. coccinea, Erica cruenta, Pelargonium cucculatum, P. capitatum, P. betulinum, Felicia filifolia, F. erigeroides, F. aethiopica, Salvia aurea, S. africana, Restio dispar, R. multiflorus, Elegia fenestrata, E. filacea, E. fistulosa, Dimorphtheca pluvialis, Ursinia anthemoides subsp. anthemoides, Senecio elegans, S. arenarius, Delosperma littorale, Cotyledon orbiculata, Carprobrotus mellei, C. muirii, C. edulis subsp. edulis and Oedera imbricata.  

No pests have been recorded.