Datura discolor Bernh. Desert thorn apple. Local annual; uncommon on sandy flats and along washes, south of Manville and west of Sandario roads, Sanctuary Cove, and Tumamoc Hill; 670 & 810 m (2200 & 2650 feet); flowers white with purplish throat, August & October.
(2) http://plantsdatabase.com/go/684/
Full Sun
Average Water Needs; Water regularly; do not overwater
(3) http://www.erowid.org/plants/datura/datura_cultivation1.shtml
The herbaceous daturas are generally grown from seeds in early spring. They should be started in flats indoors in the North, or where they are to stand in warmer areas. The perennial kinds usually rise from thick tuberous roots. In the North these may be dug in autumn and stored in semi-dry peat moss, sawdust, or sand in a cool place until spring. These daturas generally prefer loose, sandy soils, somewhat on the dry side, and a sunny location. Those native to the Southwest will stand considerable drought.
Harvesting:
The leaves and tops are preferably harvested when the plants are in full bloom, but they may be gathered at any time from the appearance of flowers until frost. They should be stripped from the stem and dried as quickly as possible. Fresh leaves have a fetid odor, which is lost on drying. Seeds harvested for psychoactive purposes are collected by removing the capsules when they are ripe, but are still green and unopened. These are dried in the sun or by low heat. Seeds for growing purposes should be gathered by collecting capsules that are just opening, removing the seeds and drying in the sun.
(4) http://jlhudsonseeds.com/SeedlistD.htm
NEW--discolor. (d,l) DATU-6. $2.00
Needs cold treatment, GA-3 or aging to germinate.
NEW--discolor GA-3. (d,g) DATU-6G. $3.00
'DESERT THORNAPPLE.' White 4 - 6" trumpets flushed purple or indigo in the throat. Upright annual to 1 1/2 feet, with greyish foliage and nodding spiny pods. Colorado Desert of California & south. An unusual species, the large flowers contrasting with the small stature of the plant. Germinates in 1 - 6 weeks.