Chilling treatments can help delay flowering in certain Agastache species

Added on 12 July 2024

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Chilling treatments can help delay flowering in certain Agastache species

Sonoran sunset experiment plants | Credit: James Klett

Agastache is a genus in the Lamiaceae (mint) family. Known as giant hyssops, these perennials have beautiful foliage that produces a strong and sweet fragrance when brushed against. Agastache normally grows in mountains or deserts and is edible and can be used as an herb, in tea, or for medicinal purposes. There are about 22 different species of Agastache, and they are native to Asia (Russia, China, and other countries in Eastern Asia), and North America (western and eastern Canada, southwestern U.S., and Mexico).

In a previous article published in Greenhouse Grower, the authors discuss the cold tolerance of four different taxa of Agastache: A. rupestris (Sunset hyssop), A. cana ‘Sinning’ (Sonoran Sunset hyssop), A. aurantiaca ‘P012S’ (Coronado hyssop), and A. aurantiaca ‘Pstessene’ (Coronado Red hyssop). Coronado hyssop and Coronado Red hyssop had significant death caused by intolerance to cold temperatures.