The original South American Alstroemeria species grow in climates ranging from the desert to the snow lines of the Andes Mountains, and have different environmental requirements. Radiation has been used to induce mutations in order to produce the new commercial varieties, which often have characteristics dominated by their native parent plants. Cultivars do not respond the same in greenhouse Pynvironments. Although many cultivars are available, cultural recommendations have resulted primarily from studies on 'Regina' and 'Orchid' (also known as 'Walter Fleming'). Consequently, growers must experiment with Alstroemeria in their own setting, while cautiously sorting through cultural information from outside sources.
Source: • Colorado State Flower Growers Association Bulletin #436