Astrophytum ornatum 'Hakuun'
Astrophytum ornatum 'Hakuun' is a selected form of the monk's-hood cactus, Astrophytum ornatum, prized for its unusually heavy white flecking. Where the wild species carries scattered tufts of woolly flecks, 'Hakuun' — the name means "white cloud" — builds those flecks into broad, cloud-like bands that sweep across the ribs between the spine clusters. Care follows the parent species; see Astrophytum ornatum.
Description
'Hakuun' keeps the tall, columnar-to-globose body, sharply defined ribs, and stiff, curving spines that make Astrophytum ornatum so distinctive. What sets the selection apart is the density and arrangement of the trichome flecking. On typical A. ornatum the white flecks are woolly and somewhat scattered; on 'Hakuun' they coalesce into thick, wavy bands of near-solid white that run across the green epidermis, leaving darker windows only near the areoles and the deepest parts of the rib furrows. The effect is a plant that reads as chalk-white overlaid with green rather than the reverse. Like the parent, mature plants can produce large, glossy yellow flowers from the crown. The intensity of the flecking varies from seedling to seedling, so growers often select the whitest individuals to carry the line on.
Cultivation
Grow 'Hakuun' exactly as you would Astrophytum ornatum: bright light, a fast-draining mineral-rich mix (see Soil and potting mix), and cautious watering that lets the roots dry fully between soakings, with a dry, cool rest in winter (see Watering). One practical note for the heavily flecked forms — water splashed onto the body can leave mineral spotting on the white areas and mat down the flecking, so water at the soil line where you can rather than overhead. Keep it above freezing; it is comfortable in the warm end of USDA zones 9b–11 or under cover in colder climates.
See also
- Astrophytum ornatum — the parent species
- Astrophytum — the genus overview
- Soil and potting mix · Watering · Propagation — seed