Hesperocallis undulata
Pamela Slate (Thu, 05 Aug 2010 13:36:34 PDT)

For those interested in this species, please see: 
http://desertmuseumdigitallibrary.org/public/…
undulata

I've heard people in the plant community here say these bulbs have been
found growing as deeply as a meter.  Even if they were at a two-foot depth in
sand, this alone would account for expected cultivation difficulty.  Unless rain
is torrential and/or prolonged, it won't reach the bulb to initiate flowering
which helps explain why they don't flower every year.  Best flowering occurs in
wet years here.  That means wet winters since these flower in late spring.  Same
with Borrego, as Michael noted (and thanks for that info).

However, if any of you would like for me to ask locals in the botanic
community whether anyone has succeeded in growing these in home landscape or
greenhouse situations, please contact me and I'll be happy to oblige.

Pamela

Pamela Slate
P.O. Box 5316
Carefree AZ 85377