Diastella parilis is easily propagated by cuttings and seed. Seed must be treated to prevent attack by pre-and post-emergence damping-off fungi. Treat your seed with a dusting systemic fungicide containing the active ingredient metalaxyl. The seed is best sown in late summer or early autumn. Use a well-aerated and well-drained sowing medium, smoke the seeds, using dry and green fynbos materials, or treat with Instant Smoke Plus Seed Primer. At Kirstenbosch National Botanical Garden, seed trays are placed inside a plastic tent and smoke from burning fynbos, is piped into the tent. However, most cultivation is done by cuttings, as seed collection is difficult and time consuming.

Take cuttings of semi-hardwood during autumn and spring and treat with a rooting hormone to stimulate the rooting. Dip the cuttings in the rooting hormone for at least 5 seconds. Place your cuttings in a well-drained, well-aerated rooting medium of 70% perlite and 30% fine bark or coarse sand and finely milled pine bark. Insert the cuttings in the multitrays with space between each cutting to allow air circulation and place them on heated benches of 25ºC, under intermittent mist. Regularly treat the cuttings with the fungicide to prevent fungal infections. Remove the dead leaves and wilting cuttings, until your cuttings are rooted. Move the rooted cuttings to the hardening-off house for about 2 weeks and pot the cuttings into small pots or bags, using the mixture suitable for fynbos, i.e. a well-drained, acidic medium of fine bark, coarse sand and finely milled pine bark.

Place the seedlings or cuttings under shade net in the nursery and grow on for a period of  2 to 3 years, until they are ready to be planted into the garden. Net shade reduces the direct sun, which can dry out the soil in the bags and can also prevent scorching.

Diastella parilis is a water-wise shrub when established, but it will need watering in summer for about 2 to 3 years to establish the roots. Plant the seedlings in an acidic soil, preferably between 5–7 pH levels. Diastella parilis does need pruning to keep the rounded shape.

Keep the soil moist during the hot dry season by mulching your bed about 5 mm thick. The mulch will keep the roots cool, keep moisture in the soil and reduce the growth of weeds. Chipping mulch is recommended, as they break down very slowly and also release small amount of nutrients to the plant.

Diastella parilis is resistant to Phytophthora and is not affected by other serious insect pests, however, seedlings are highly susceptible to pre- and post-emergence damping-off fungi.