Description
Astrophytum coahuilense cv. Hakuran (also known as Astrophytum coahuilense f. monstruosa or “kikko”) is easily distinguishable for its ± wide and long pointed tubercles along the ribs edges. In general the bigger the “teeth” are and the longer and stiffer they are, the better. All species of Astrophytum (excluded Astrophytum caput-medusae) have their particular “kikko” variants.
Stem: Pentagonal to almost spherical, dimension 10-15 cm tall, 5-10 cm in diameter.
Spines: None.
Ribs: Usually 5 (but sometime 3 or 4).
Flowers: Like those of the well known Astrophytum coahulense yellow with a contrasting red throat.
Blooming season: Spring to summer.
Origin and Habitat
The Astrophytum coahuilense cv. Hakuran was produced in 1981 by Mr. Narita from Aichi Prefecture, Japan.
Cultivation and Propagation
Although regarded as a choice and difficult plant in cultivation it is relatively easy to grow.
Growth rate: This cultivar is very slow growing and is often seen grafted onto columnar cacti to speed growth, but grows on its own roots too even if painfully slowly. It possible to increase the speed of growth to some extent by providing adequate amount of water and fertilizer.
Soil: Use mineral well permeable substratum with little organic matter (peat, humus).
Moisture: Water sparingly from March till October and keep perfectly dry in winter.
Hardiness: Overwinter at temperatures from 5 to 15 degrees centigrade. (but it is Hardy to -5°C for short periods) In the rest period no high atmospheric humidity!!
Sun Exposure: Light shade to full sun.
Propagation: By seed or usually grafted onto column-shaped cacti.
Bibliography
Major references and further lectures
- Sumihiro Saeki “The history of Astrophytum in Japan” Cactus Nursery Saisen-en October 30, 2011
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