Origin and Natural Habitat
Astroloba cremnophila is native to the Gouritz River area in the Western Cape of South Africa.
Plant Characteristics
Astroloba cremnophila is a tall growing species, with elongated stems covered in hard, triangular leaves. Each leaf is dotted with small white spots and lined with red ridges.
Care Guide
Light
Astroloba cremnophila prefers a lightly shaded location in the greenhouse. Avoid keeping this species in direct sun. If kept outside, 40% shade cloth is preferred.
Soil
Astroloba as a genus requires a very well-draining soil mixture with plenty of gritty components. A medium with akadama and pumice is preferred.
Water
In cultivation, Astroloba can be watered well during the cooler months. However, it is important to reduce the amount of water it receives during summer when it is dormant.
Pot size
Astroloba can grow up to 30cm tall, so the pot must be quite stable. A 10cm pot will be sufficient initially, but as the plant grows older and clusters, it should be planted in a pot that is 3-4cm wider than its root system to accommodate new growth. The root systems are not extensive, so shallow pots are fine.
Temperature
Astroloba cremnophila’s ideal temperature ranges between 15 – 25°C. It can tolerate -1 – 40°C. This species is semi-tolerant to frost, but should not be exposed to below freezing temperatures for extended periods.
Humidity
Astroloba cremnophila is somewhat sensitive to humidity due to their semi-arid natural habitat. Make sure that your growing space has plenty of airflow.
Fertilizing
Use a half-strength diluted general liquid fertilizer only during the growing season. Do not fertilize during summer. Alternatively, a small amount of slow-release fertilizer will be sufficient.
Growing season
Astroloba cremnophila generally grows during autumn, winter and early spring.
Propagation
Astroloba can be propagated from cuttings and through seed germination.
Seed germination: Seeds should be sown in early autumn. Plant the seeds in a coco peat mix in an airtight container, and cover them with fine sand. Once most of the seeds have germinated, remove the lid of the container to allow airflow. Gently water the seedlings every few days so that the soil does not dry out.
Stem cuttings: Astroloba is easy to propagate from stem cuttings. It is best to take cuttings in autumn. Cuttings will not root well in mid-winter or summer. Simply use a sterilized sharp knife to remove a branch from the main stem. Make sure it is at least one third of the size of the main stem of the plant before removing it, otherwise it may struggle to survive. Let this cutting air dry for four weeks. Plant the cuttings in the same soil as the mother plant.