| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Jasminum officinale | Flower | -- | -- | * | |
| Lepidium sativum | Plant | -- | -- | * | |
| Mentha x piperita | Leaf | 0.002 | 0.02 | Duke, J. A. Writeups or information summaries on approximately 2,000 economic plants, USDA, ARS, Beltsville, MD 20705. | |
| Tropaeolum majus | Shoot | -- | -- | * |