Although Lachenalia sargeantii is extremely rare in cultivation, it is an easily grown species. It produces leaves reliably every year and the bulbs multiply, but unfortunately the bulbs do not flower. Smoke-treating the bulbs in the nursery at Kirstenbosch has not induced flowering so far, but treatment of the growing medium surface with burning fynbos material may prove successful, for which purpose the bulbs are best grown in deep terracotta pots.

Place the pots where they will receive morning sun and afternoon shade, or alternatively bright light for as much of the day as possible. The plants require an extremely well-drained acid, sandy growing medium, such as three parts coarse river sand mixed with one part finely milled acid bark, or finely sifted acid compost.

Plant the bulbs in mid-autumn at a depth of 15-20 mm and water well. Once the leaves have appeared, apply a heavy drench approximately once per week until late spring, then allow the growing medium to dry out completely until the following autumn.

Sow the seeds in mid-autumn in pots or deep seed trays, in the same medium recommended for adult bulbs, with a 2-3 mm layer of river sand placed over the seeds, and keep moist using a watering can with a fine rose.

The bulbs are extremely sensitive to over-watering during their summer dormant period, and cannot be grown under general garden conditions where summer irrigation is carried out. The bulbs and leaf bases are susceptible to attack by the universal mealy bug scourge.