Diastella divaricata subsp. divaricata is easily propagated by cuttings and seed. Select the cuttings from healthy plants. Take heel or tip cuttings of semi-hardwood 30–70 mm long in autumn and spring. Treat with a rooting hormone to stimulate rooting. Dip the cutting in the rooting hormone for at least 5 seconds. Place your cuttings in a well-drained and aerated medium of 70% perlite and 30% fine bark or use coarse sand and finely milled, pine bark sowing medium. Insert the cuttings in the multitrays with a space between each cutting to allow air circulation, and place them on the heated benches of 25ºC under intermittent mist. Regularly treat the cuttings with fungicide to prevent fungal infection. 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 transfer the cuttings into small nursery plastic bags using a fynbos mixture of well-drained, acidic medium of fine bark, coarse sand and finely milled, pine bark.

The seeds are not easy and time-consuming to collect, therefore most cultivation is done by cuttings. Seed must be treated with a fungicide to prevent pre-and post-emergence damping-off. Treat your seed with a dusting systemic fungicide containing the active ingredient, metalaxyl. The seed is sown in late summer or early autumn. Use a well-aerated and well-drained potting or sowing medium and treat with smoke. Lay the seed trays under the plastic tent and the pipe, in the smoke of burning, fynbos plant material. Smoke-plus seed primer packets are also available to use and can be ordered from Kirstenbosch National Botanical Garden Seedroom.

Place the seedlings or cuttings under the shade net in the nursery until they are ready to be planted into the garden, after a period of 2 to 3 years. Net shade reduces the direct sun which can dry out the soil in the plastic bags and can also prevent scorch. Diastella divaricata subsp. divaricata is a water-wise shrub that will need to be watered for about 2 to 3 years, to establish the roots. Plant the seedlings in sandy acidic soil with between 5–7 pH levels.

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 to the soil and reduce the growth of weeds. Chipping mulch is recommended, as they break down very slowly and also releases small amounts of nutrients to the plant. Diastella dicaricata subsp. divaricata does need pruning to keep the rounded shape and nice cascade in a container.

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

Diastella divaricata subsp. divaricata can be grafted on the scion of the hybrid ‘Veld Fire’, a cross between Leucospermum glabrum and L. conocarpodendron subsp. conocarpodendron. The grafted plant can sustain the longevity and resistance of the plant in the garden.