| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Maclura pomifera | Fruit | -- | 10000.0 | 1.7 | * |
| Azadirachta indica | Flower | -- | 2000.0 | 1.3 | * |
| Thespesia populnea | Flower | -- | 700.0 | -0.3 | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |
| Camellia sinensis | Leaf | -- | 520.0 | 1.9 | * |
| Pisum sativum | Tissue Culture | -- | 500.0 | * | |
| Brassica oleracea var. capitata l. | Leaf | 100.0 | 300.0 | 0.8 | Jim Duke's personal files. |
| Brassica oleracea | Shoot | -- | 80.0 | 1.7 | * |
| Allium schoenoprasum | Leaf | 16.0 | 55.0 | -0.5 | * |
| Brassica oleracea var. botrytis l. | Flower | -- | 30.0 | -1.1 | * |
| Syzygium aromaticum | Fruit | -- | 29.0 | -0.6 | * |
| Maclura pomifera | Bark | -- | 29.0 | * | |
| Agrimonia eupatoria | Shoot | -- | 24.0 | -0.3 | * |
| Cichorium intybus | Seed | -- | 20.0 | * | |
| Acinos suaveolens | Shoot | -- | 16.6 | -0.6 | Jim Duke's personal files. |
| Brassica oleracea var. sabellica l. | Leaf | -- | 13.0 | -0.7 | * |
| Melilotus officinalis | Shoot | -- | 12.5 | -0.8 | * |
| Armoracia rusticana | Root | -- | 6.0 | * | |
| Vitis vinifera | Fruit | -- | 2.0 | -0.6 | * |
| Allium cepa | Bulb | -- | 2.0 | * | |
| Malus domestica | Fruit | -- | 2.0 | -0.6 | * |