The following is a list of plants actually containing iron in parts-per-million (ppm):

1. Taraxacum officinale – Dandelion (Leaf) 500-5,000 ppm

2. Echinacea spp – Coneflower (Root) 700-4,800 ppm

3. Symphoricarpos orbiculatus – Buckbush (Stem) 19-4,400 ppm

4. Valerianella locusta – Corn Salad (Plant) 3,519-4,143 ppm

5. Artemisia vulgaris – Mugwort (Plant) 1,200-3,900 ppm

6. Boehmeria nivea – Ramie (Plant) 1,500-3,500 ppm

7. Physalis ixocarpa – Tomatillo (Fruit) 14-2,974 ppm

8. Harpagophytum procumbens – Devil’s Claw (Root) 2,900 ppm

9. Asiasarum heterotropoides – Asian Wild Ginger (Root) 450-2,800 ppm

10. Asiasarum sieboldii – Siebold’s Wild Ginger (Root) 450-2,800 ppm

11. Stellaria media – Chickweed (Plant) 2,530 ppm

12. Verbascum thapsus – Mullein (Leaf) 2,360 ppm

13. Mentha pulegium – European Pennyroyal (Plant) 2,310 ppm

14. Carthamus tinctorius – Safflower (Flower) 81-2,200 ppm

15. Petasites japonicus – Butterbur (Plant) 2,000-2,100 ppm

16. Amaranthus spinosus – Spiny pigweed (Leaf) 22-1,965 ppm

17. Polystichum polyblepharum – Chinese Polystichum (Plant) 500-1,900 ppm

18. Trifolium pratense – Red Clover (Shoot) 10-1,850 ppm

19. Nyssa sylvatica – Black Gum (Leaf) 8-1,820 ppm

20. Angelica dahurica – Bai Zhi (Root) 1,800 ppm

21. Schizonepeta tenuifolia – Ching-Chieh (Plant) 1,700 ppm

22. Caulophyllum thalictroides – Blue Cohosh (Root) 1,640ppm

23. Ruscus aculeatus – Butcher’s Broom (Root) 1,640 ppm

24. Diospyros virginiana – American Persimmon (Stem) 3-1,620 ppm

25. Amaranthus sp. – Pigweed (Leaf) 23-1,527 ppm

26. Thymus vulgaris – Common Thyme (Plant) 1,075-1,508 ppm

27. Camellia sinensis – Tea (Leaf) 189-1,500 ppm

28. Manihot esculenta – Cassava (Leaf) 28-1,500 ppm

29. Arctium lappa – Gobo (Root) 8-1,470 ppm

30. Prunus serotina EHRH. – Black Cherry (Leaf) 20-1,440 ppm

31. Berberis vulgaris – Barberry (Root) 1,410 ppm

32. Anemarrhena asphodeloides – Chih-Mu (Rhizome) 90-1,400 ppm

33. Peucedanum decursivum – Qian Hu (Plant) 780-1,400 ppm

34. Nepeta cataria – Catnip (Plant) 1,380 ppm

35. Chamissoa altissima – Guanique (Leaf) 137-1,370 ppm

36. Cynanchum atratum – Bai-Wei (Root) 1,350 ppm

37. Juniperus virginiana – Red Cedar (Shoot) 11-1,320 ppm

38. Polygonum cuspidatum – Japanese Knotweed (Plant) 360-1,300 ppm

39. Senna occidentalis – Coffee Senna (Seed) 1,300 ppm

40. Equisetum arvense – Field Horsetail (Plant) 698-1,230 ppm

The following is a list of plants actually containing copper in parts-per-million (ppm):

1. Prunus serotina – Black Cherry (Stem) 1.3-378 ppm
2. . Liquidambar styraciflua – American Styrax (Stem) 0.6-360 ppm
3. Nyssa sylvatica – Black Gum (Leaf) 1.25-182 ppm
4. Liquidambar styraciflua – American Styrax (Leaf) 2.8-164 ppm
5. Symphoricarpos orbiculatus – Buckbush (Stem) 3.8-132 ppm
6. Diospyros virginiana – American Persimmon (Stem) 0.2-108 ppm
7. Sassafras albidum – Sassafras (Leaf) 1.6-102 ppm
8. Lycopersicon esculentum – Tomato (Fruit) 0.4-100 ppm
9. Brassica oleracea var. capitata – Cabbage (Leaf) 0.3-87 ppm
10. Corylus avellana – English Filbert (Seed) 13-82 ppm
11. Sassafras albidum – Sassafras (Stem) 0.2-56 ppm
12. Sesamum indicum – Sesame (Plant) 14-56 ppm
13. Carya glabra – Pignut Hickory (Shoot) 0.9-55 ppm
14. Brassica oleracea var. botrytis – Broccoli (Leaf) 0.68-52 ppm
15. Carya ovata – Shagbark Hickory (Shoot) 1.25-45 ppm
16. Phaseolus vulgaris – Blackbean (Fruit) 0.62-45 ppm
17. Brassica oleracea – Collards (Leaf) 2-43 ppm
18. Cucumis sativus – Cucumber (Fruit) 0.3-42 ppm
19. Quercus stellata – Post Oak (Stem) 1.2-42 ppm
20. Anacardium occidentale – Cashew (Seed) 22-37 ppm
21. Rosa canina – Rose (Fruit) 1.8-36 ppm
22. Eupatorium odoratum – Jack bush (Leaf) 35 ppm
23. Rhizophora mangle – Red Mangrove (Leaf) 35 ppm
24. Prunus domestica – Plum (Fruit) 0.33-34 ppm
25. Cocos nucifera – Coconut (Seed) 3.2-33 ppm
26. Pistacia vera – Pistachio (Seed) 11-33 ppm
27. Psophocarpus tetragonolobus – Asparagus Pea (Seed) 28-33 ppm
28. Senna obtusifolia – Sicklepod (Seed) 9-32 ppm
29. Nyssa sylvatica – Black Gum (Stem) 0.3-31 ppm
30. Quercus velutina – Black Oak (Stem) 1.5-31 ppm
31. Cucurbita maxima – Pumpkin (Leaf) 4.2-30 ppm
32. Helianthus tuberosus – Jerusalem Artichoke (Plant) 8-30 ppm
33. Momordica charantia – Bitter Melon (Fruit) 30 ppm
34. Prunus persica – Peach (Fruit) 0.3-30 ppm
35. Rhus copallina – Dwarf Sumac (Stem) 1.8-30 ppm
36. Rumex acetosa – Garden Sorrel (Leaf) 3-30 ppm
37. Arctium lappa – Gobo (Root) 29 ppm
38. Lactuca sativa – Lettuce (Leaf) 0.36-29 ppm
39. Prunus serotina – Black Cherry (Leaf) 0.8-29 ppm
40. Quercus phellos – Willow Oak (Stem) 1-29 ppm

Few plants contain metallic mercury. The following list shows plants actually containing mercury in parts-per-million (ppm):

1. Cinnamomum aromaticum – Cassia (Plant) 60 ppm
2. 2. Fucus vesiculosus – Bladderwrack (Plant) 40 ppm
3. 3. Rhodymenia palmata – Dulse (Plant) 26 ppm
4. 4. Lycium chinense – Wolfberry (Fruit) 8 ppm
5. 5. Chondrus crispus – Irish Moss (Plant) 7 ppm
6. Juncus effusus – Rush (Pith) 1.41 ppm
7. 7. Arctium lappa – Gobo (Root) 1.27 ppm

Metallic silver is rarely in the plant kingdom. The following is a list of plants known to actually contain metallic silver in parts-per-million (ppm):

1. Lycopersicon esculentum – Tomato (Fruit) 0-1.4 ppm
2. 2. Quercus rubra – Northern Red Oak (Stem) 0-1.32 ppm

The following is a list of plants actually containing tin in parts-per-million (ppm):

1. Schisandra chinensis – Chinese Magnoliavine (Fruit) 940 ppm

2. Elytrigia repens – Couchgrass (Plant) 67 ppm

3. Juniperus communis – Common Juniper (Fruit) 63 ppm

4. Silybum marianum – Milk Thistle (Plant) 42 ppm

5. Gentiana lutea – Yellow Gentian (Root) 40 ppm

6. Cypripedium pubescens – Ladyslipper (Root) 33 ppm

7. Rhodymenia palmata – Dulse (Plant) 33 ppm

8. Althaea officinalis – Marshmallow (Root) 29 ppm

9. Valeriana officinalis – Valerian (Root) 28 ppm

10. Chondrus crispus – Irish Moss (Plant) 27 ppm

11. Urtica dioica – European Nettle (Leaf) 27 ppm

12. Achillea millefolium – Yarrow (Plant) 26 ppm

13. Berberis vulgaris – Barberry (Root) 26 ppm

14. Cnicus benedictus – Blessed Thistle (Plant) 25 ppm

15. Trifolium pratense – Red Clover (Flower) 25 ppm

16. Fucus vesiculosus – Bladderwrack (Plant) 24 ppm

17. Glycyrrhiza glabra – Licorice (Root) 24 ppm

18. Harpagophytum procumbens – Devil’s Claw (Root) 24 ppm

19. Mentha pulegium – European Pennyroyal (Plant) 24 ppm

20. Rumex crispus – Curly Dock (Root) 24 ppm

21. Cucurbita pepo – Pumpkin (Seed) 23 ppm

22. Humulus lupulus – Hops (Fruit) 22 ppm

23. Myrica cerifera – Bayberry (Bark) 22 ppm

24. Rosa canina – Rose (Fruit) 22 ppm

25. Arctium lappa – Gobo (Root) 21 ppm

26. Caulophyllum thalictroides – Blue Cohosh (Root) 21 ppm

The following is a list of plants actually containing lead in parts-per-million (ppm):

1. Nyssa sylvatica – Black Gum (Leaf) 0.2-182 ppm

2. Symphoricarpos orbiculatus – Buckbush (Stem) 2-176 ppm

3. Juniperus virginiana – Red Cedar (Shoot) 0.7-132 ppm

4. Nyssa sylvatica – Black Gum (Stem) 0.1-132 ppm

5. Prunus serotina – Black Cherry (Stem) 0.2-108 ppm

6. Carya glabra – Pignut Hickory (Shoot) 2-103 ppm

7. Rhus copallina – Dwarf Sumac (Stem) 0.2-92 ppm

8. Fucus vesiculosus – Bladderwrack (Plant) 91 ppm

9. Diospyros virginiana – American Persimmon (Stem) 0.2-81 ppm

10. Quercus alba – White Oak (Stem) 0.2-76 ppm

11. Prunus serotina – Black Cherry (Leaf) 0.3-67 ppm

12. Rhus copallina – Dwarf Sumac (Leaf) 0.2-67 ppm

13. Malus domestica – Apple (Fruit) 0.002-64 ppm

14. Pinus echinata – Shortleaf Pine (Shoot) 1.7-63 ppm

15. Lycopersicon esculentum – Tomato (Fruit) 0.003-60 ppm

16. Quercus stellata – Post Oak (Stem) 0.7-59 ppm

17. Liquidambar styraciflua – American Styrax (Stem) 0.2-57 ppm