Astrophytum myriostigma “tricostatum”
Astrophytum myriostigma f. tricostatum
Astrophytum myriostigma tricostatum is a nursery produced cultivar.
A. myriostigma tricostatum is characterised by the presence of only three ribs on its stem. Sometimes, the plant will develop more ribs while aging. This Astrophytum is covered in different densities by white flecks; however, nude specimens exist and are differently beautiful. After 4-5 years of life, during warm season this plant will bloom intermittently, with large, yellow flowers arising from the areole at the tip of the stem.
This Astrophytum is a quite slow-growing cultivar. It needs a mineral, well-draining substratum, and a good amount of sunlight to grow healthy: its appearance will get more beautiful when it is grown in light shade. Water sparingly from spring to autumn, and during the warm season you can add a little nitrogen fertilizer. Theoretically, A. myriostigma tricostatum is tolerant to freezing temperatures (-7°C ), but in winter it has to be ketp perfectly dry to prevent root rot and frost-damages.
Propagation is usually done by seeds, but sometimes this Astrophytum is grafted on other cacti.
Old and big three-ribbed Astrophytum are beautiful, rare and in consequence, high-prized.