Data Views Total Plants: 2 CSV Excel PDF Total Activities: 21 Click on column headings to sort table by that column Plant Part All Bulb Herb Low PPM High PPM StdDev *Reference Allium sativum var. sativum Bulb -- -- * Portulaca oleracea Herb -- 10.0 * *Unless otherwise noted all references are to Duke, James A. 1992. Handbook of phytochemical constituents of GRAS herbs and other economic plants. Boca Raton, FL. CRC Press.