Geissorhiza tulbaghensis is mainly propagated by seed, but can also be propagated by the removal of cormlets from the base of a mature corm. Deep plastic seed trays or deep seedbeds are recommended when sowing seeds in autumn. Place sowed seeds in an area receiving morning sun or sufficient light and keep moist, but protect them from heavy winter rains. The sowing medium should be well drained, yet it should not dry out too quickly. The recommended sowing medium is equal parts of fine river-sand and finely sifted compost. It is very important to sow seeds thinly and evenly, in order to reduce the risk of damping-off, to which the seedlings are very susceptible.

Fresh seeds germinate within 4 weeks and it is vital to keep the medium continually moist by regular watering every 2 to 3 days with fine irrigation. During the summer dormant period, the dry soil containing the mature corms can be placed over a fine sieve, in order to remove daughter corms. These daughter corms are easily detached from the base of mature corms and can be replanted immediately in a dry growing medium, or be stored dry in paper packets until the following autumn.

Geissorhiza tulbaghensis are not particularly vulnerable to pest attack, but aphids do periodically feed on developing flower-buds. These aphids can be controlled by spraying an insecticide. G. tulbaghensis corms are susceptible to infestation by mealy bug, which is best treated by drenching plants, in active growth, with an insecticide. Adult corms are subject to fungal rot when not allowed to completely dry out during the dormant summer period. Seedlings often fall prey to damping-off, this can be rectified by sowing the seeds thinly in a well-aerated environment, and by dusting the seeds with a fungicide powder before sowing.