Thamnochortus acuminatus is propagated by seed. The seed respond very well when sown in autumn and early winter when the temperature drops to 5–10ºC at night and 15–20ºC in the day. It is important that your seed be collected when mature for successful germination. The seed treated with smoke derived from burning dry and wet fynbos plant material, helps to break the seed dormancy and stimulate germination. Treatment can be done in a smoking tent or use the Kirstenbosch Seed Primer smoke packets. Soak the seeds or dust them with fungicide and water the sown seeds with fungicide once a week, to prevent fungal infection. 

Lay the seeds on well-drained fynbos soil and cover with a fine, sieved, fynbos soil mixture. Ensure that all seeds are covered and watered using a fine spray, to avoid losing seeds from being blown or washed away. Within the period of 4 weeks, seeds will begin to sprout. Feed the seedlings with organic fertilizer during the growing season, to prevent yellowish and unhealthy growth. Keep your seedlings moist, not dry or too wet, as it helps to prevent fungal infestation. 

This is a slow-growing restio and the seedlings are ready to plant in the open ground after a period of 2 years. The young plants begin to flower in the third year, with less flowers and abundance the following year. The best time to plant the seedlings is in autumn or early winter, the beginning of the rainy season. Plants prefer full sun in a well-drained, acidic soil, and plenty of air movement. Mulch the bed to reduce water evaporation, keep the roots cool and prevent weed growth. Always prune any branch of other plants growing over this spectacular species.