Ixia viridiflora makes an excellent pot plant but is not well suited to a permanent position in the garden, even in winter rainfall areas. They are susceptible to fungal diseases, are eaten by mole rats and porcupines, and need a completely dry summer. To deal with this problem, one can plunge pots of Ixia viridiflora into the garden during the growing and/or flowering period and remove them during the summer dormant period.
Corms should be planted in autumn (April-May) while still dormant. You will need a pot at least 30 cm in diameter. Place a layer of stone chips over the drainage holes and fill three quarters of the pot with a freely-draining soil mix, e.g. equal parts coarse river sand and fine compost (leaf mould). Plant the corms in a 1 cm layer of pure river sand and cover with a 1 cm layer of the soil mix. Water thoroughly immediately after planting and place in a spot that gets at least half-day sun. Once growth becomes visible, a good drenching every ten days is recommended. Because Ixia viridiflora is tall, it may need to be staked if your garden is windy. Inorganic fertilizers should be avoided, particularly high nitrogen fertilizers, but organic fertilizers can be used sparingly. When the leaves begin to dry, stop watering altogether. The corms can be left in the pot, provided it is stored in a cool, dry spot. It is advisable to lift them every second year. This gives you the opportunity to clean them, inspect them for disease and discard the badly damaged ones.