Peppermint was introduced into central Oregon in 1955. (The acreage devoted to this crop has been steadily expanding.) Additional experiments are needed on this crop to determine the effects of fertilizer placement and time of application.
Fertilization is part of the overall management of peppermint and spearmint that includes planting of disease-resistant varieties, selection of appropriate soils, irrigation, timely harvest, and control of diseases, weeds, insects, and nematodes. Other OSU publications cover pest control on peppermint (see page 4). Crop response to fertilizer may differ with...