Astrophytum asterias 'Red Kabuto'
Astrophytum asterias' 'Red Kabuto (also sold as Aka Kabuto, from the Japanese for "red helmet") is a pigment-selected form of the sea-urchin cactus Astrophytum asterias, prized for a body that flushes deep red to orange rather than the plain green of the wild type. It arose within the Japanese "Kabuto" line of cultivated asterias, where growers have long selected for exaggerated white flecking, bold body shape, and — in this case — intense red-to-orange coloration overlaid across the whole plant while the characteristic silvery flecking is retained.
Description
Like all forms of A. asterias, 'Red Kabuto' is a low, spineless, disc-shaped cactus divided into (typically) eight broad, flat ribs, with woolly areoles running down the rib crests and a fine dusting of white trichome flecks over the skin. What sets this selection apart is colour: instead of a uniform green, much of the body surface is suffused with red and orange pigment, so the plant can read as maroon, rust, coral, or bronze depending on light, season, and the individual clone. The white flecking usually stands out all the more strongly against this darker ground. Colour intensity is variable and light-dependent — plants grown hard and bright tend to blush most strongly, while shaded plants often revert toward green. As with other asterias, flowers are yellow, typically with a red-orange throat, borne from the woolly crown in the growing season.
Note that 'Red Kabuto' describes a pigment trait, not a single clone; the name is applied across a spectrum of seed-grown and selected plants of varying redness, and it is sometimes combined with other Kabuto traits (heavy flecking, "super Kabuto" patterning, or variegation).
Cultivation
Care is essentially as for the parent species — see Astrophytum asterias for full detail. In brief: grow in a fast-draining mineral mix (see Soil and potting mix), water sparingly and allow the mix to dry fully between waterings, keep the plant dry and cool through winter dormancy (see Watering), and protect it from frost.
The one point that deserves emphasis is light. The red pigmentation that defines this selection is strongest under bright conditions; plants kept too shady tend to green up and lose the very trait they were chosen for. Give it the brightest light it will tolerate, easing it into strong sun gradually to avoid scorching, and expect the colour to deepen as the plant is grown a little harder and cooler. Because these are typically seed-grown, plants labelled 'Red Kabuto' vary — some individuals colour up far more readily than others.
See also
- Astrophytum asterias — the parent species
- Astrophytum — the genus overview
- Astrophytum asterias 'Super Kabuto' — the heavily-flecked Kabuto selection
- Soil and potting mix · Watering · Propagation — seed