Astrophytum myriostigma 'Fukuryu'
Astrophytum myriostigma 'Fukuryu is a Japanese-selected cultivar of the Bishop's Cap cactus prized for its wrinkled, bulging ribs. Where a typical myriostigma shows clean, smooth-flanked ribs, Fukuryu develops extra folds and lumpy swellings running down the sides of each rib, giving the body a knobbly, brain-like or dragon-scale texture — the name is often translated in the hobby as "hidden dragon."
Description
Fukuryu keeps the overall geometry of Astrophytum myriostigma — a spineless, usually five-ribbed (sometimes three- to eight-ribbed) globular-to-columnar body — but the surface is heavily modified. Instead of flat or gently rounded rib faces, the flanks bulge, pucker, and pleat, so that extra wrinkles and bulbous folds run vertically down each rib. This lumpy relief catches light and shadow and gives the plant a sculptural, almost tuberculate look, quite different from the smooth star of a standard Bishop's Cap. The degree of wrinkling varies from plant to plant and tends to become more pronounced with age.
The white flecking (the fine woolly scales that dust the epidermis of most myriostigma) may be present or reduced depending on which line the plant comes from. Fukuryu is frequently combined with other selections — for example the nudum (naked, scaleless green skin) forms and the Hekiran lineage — producing named combinations such as Fukuryu Hekiran, a smooth-green, wrinkle-ribbed plant. Flowers are the typical Astrophytum funnels, glossy yellow, often with a reddish-orange throat, borne from the woolly areoles near the crown on mature plants.
Cultivation
Care is the same as for the parent species, Astrophytum myriostigma. Give it bright light — the wrinkled ribs actually show best under strong light, which keeps the body compact and the folds well defined; protect from the most intense afternoon sun in very hot climates to avoid scorching. Grow in a fast-draining mineral mix and water sparingly, letting the mix dry fully between drinks. Keep it dry and cool through winter to allow a proper dormant rest, and keep the plant above freezing (roughly USDA zones 9b–11) or overwinter it indoors. Because the deep folds can trap water and debris, be a little more careful than usual to avoid standing moisture sitting in the crevices, which can invite rot. See Watering for the general approach.
Fukuryu grows and flowers on its own roots without difficulty, but like many collector selections it is sometimes grafted to speed up seedlings or bulk up a choice plant; grafting is optional rather than necessary here.
Propagation
Fukuryu is grown from seed, and the wrinkled trait is passed to a good proportion of seedlings, though expression varies and growers select the best individuals. Seedlings may be grafted onto a vigorous stock to grow them on quickly, then often set back onto their own roots later. Being solitary, it does not readily produce offsets for cutting.
Common problems
- Rot — the most common killer, caused by overwatering, a poorly draining mix, or water lodging in the deep rib folds. Water sparingly, use a gritty mineral mix, and keep the crown and crevices dry, especially in cool weather.
- Etiolation — too little light makes the body stretch and flattens the very folds that make this cultivar worth growing. Provide bright light for compact, well-textured growth.
- Pests — watch for mealybugs (including root mealybugs) and red spider mite; the sheltered creases can hide mealybugs, so inspect the folds when checking the plant.
See also
- Astrophytum myriostigma — the parent species
- Astrophytum — the genus overview
- Astrophytum myriostigma 'Hekiran' — the smooth-green nudum selection often combined with Fukuryu
- Soil and potting mix · Watering · Propagation — seed · Grafting