"Webster's Hedgehog Cactus"
This photograph shows an unusual behaviour of Webster's Hedgehog Cactus. Normally, for many of its earlier years, E. websterianus remains a solitary columnar cereus with 18 to 24 ribs carrying golden yellow, slightly recurved spines, about 10 to 14, and 6 to 8 central spines per areole.
Webster's Hedgehog is native to Baja California and Mexico, Sonora, San Pedro Nolasco. In habitat, its 8cm (3") stem will grow to 60cm (24") tall but in the greenhouse we will normally cut it and re-root its top when it gets too long. The base, of course, will produce more pups which can also be taken and re-rooted.
E.websterianus is mentioned, often only minimally, in the more technical and advanced books and journals, hardly ever at all in the more popular horticultural books. That's because it is only one of the echinocerei, a genus renowned for its spectacular blooms; but it is less easily available and so is not so well known as others which have "captured the market", so to speak.