Corpuscularia lehmannii can be propagated using either seeds or cuttings. Though, stem cuttings are often preferred since it produces a larger plant quicker than propagation by seeds, as seedlings are slow growing.

Seed sowing is ideally done in mid-spring to early summer, while plants are actively growing. Use seedling trays and growth medium suitable for germinating succulents, such as a mix containing fine river sand (60–70%) and sifted compost (30–40%), which is often used at Karoo Desert National Botanical Garden. With the drainage of germination trays supported by coarse particles such as bark, crushed stones etc. at the base, fill trays with growth medium and moisten it. Scatter seeds evenly on the growth medium surface and then add a thin layer of fine river sand to anchor the seeds and prevent them from moving over. The layer should be minimal to allow sunlight to reach the seeds, since it is needed for germinating Coega hardfig. Place the trays inside the greenhouse receiving indirect sunlight, with a temperature ranging between 21–26°C. Then water seed trays on a daily basis using a misting sprayer, until they germinate. Where germination is practiced at home, trays can be gently watered and then sealed with plastic to retain moisture until seeds germinate, with regular misting when needed. Germination of C. lehmanni can be achieved in the first 2–4 weeks after sowing. When seedlings are established, gradually expose them to more light and airflow before transplanting, until they can withstand direct sunlight. Hardened off seedlings can be transplanted directly to the garden or in suitable pots using potting mix suitable for succulent plants.

Stem cuttings of C. lehmanni are best done in mid-spring to summer as well. It is always ideal to use sterilised equipment and healthy material for cuttings to achieve best results, i.e. secateurs, seedling trays, growth media, rooting hormone (optional) and healthy plant material. Take cuttings early in the morning, while the plant hormones are active. To further prevent pathogens from affecting cuttings, let cuttings dry for about 2 days in a dry, clean area to allow the cut end to callus, preventing rot. Then dip the callused end in semi-hardwood or hardwood rooting hormone to encourage faster root development. Insert the cut end into moist, well-draining succulent potting mix. Place the cuttings trays in a warm production house receiving indirect sunlight and water them with mist sprayer. Keep the trays moist and not wet, since air circulation is also critical for rooting while damp growth media invite pathogens. Once cuttings have rooted, transplant to a bigger container and harden off from two weeks after transplanting. Hardening off can be done following similar procedures as for hardening off seedlings.

The Coega hardfig looks great when cultivated as a pot plant, located indoors at a sunny spot receiving indirect sunlight and free airflow. Use nice ornamental pots for indoors, growing it with a well-draining succulent potting mix (2 parts coarse sand, 1 part fine compost, 1 part crushed granite). Ensure that the soil pH is neutral to slightly acidic (6.0–7.0). This plant demands minimal watering, however, it is ideal to provide moderate watering when planted indoors to prevent it from shrinking when is underwatered. Outside, this species is suitable for dry, rocky gardens designed for low maintenance. Grow the Coega hardfig in mild, dry climates, in full sun to partial shade. The soil should be well-draining and with moderate to low water-holding capacity. Water the plant well but infrequently during spring and summer, and water sparingly in autumn and winter (dormant season) – ideally once every two weeks to a month.

This species, together with other related species, often suffer from root rot caused by overwatering and poor drainage – which should be avoided at all times. Common pests such as mealybugs, aphids and spider mites may take a chance on the Coega hardfig. Treat such with insecticidal soap or neem oil; where only a few scouted on the plants, manual removal is advised. To prevent the plant from hosting pests, often remove dead or damaged parts from the plant.