This list of plants which may be poisonous or Toxic to fish has been assembled from several sources. Some of these can be deadly, most can at least be toxic and do long term damage to your fish. Therefore, at least some care should be taken if you have any of these plants near your pond.
If you do not see a particular plant on this list, the omission does not indicate the plant is not poisonous/toxic.
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| ACONITUM (Aconite, Monkshood) | roots, flowers, & leaves |
| Allamanda – | all parts |
| Allspice- | leaves,seeds |
| Alocasia | leaves and stems |
| Aloe | leaves |
| Amaryllis | bulbs |
| Anemone – | all parts |
| Angel Trumpet Tree (Datura Arborea) | flowers & leaves |
| Anthurium | all parts |
| Apple | seeds contain hydrocyanic acid |
| Aprcot | leaves |
| Atropa Belladonna | all parts, especially black berries |
| Autumn Crocus (C. Sativus, Saffron Crocus) | bulbs |
| Azaleas (Rhododendorn) | Leaves |
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| Balsam Pear Seeds, Outer Rind of | Fruit |
| Baneberry | berries, roots |
| Beach Pea (Lathyrus Maritimus) | stems |
| Betel Nut Palm | all parts |
| Bird of Paradise | Seeds |
| Bittersweet (Celastrus) | berries |
| Black Locust | Bark, sprouts, foliage |
| Black walnut | hulls |
| Bleeding Heart (Dicentra, Dutchman's Breeches) | foliage & roots |
| Bluebonnets (Lupinus) | all parts |
| Blue-Green Algae | Some forms toxic |
| Bottlebrush (Callistemon, possibly Melaleuca) | flowers |
| Boxwood | Leaves, stems |
| Buckeye (Aesculus, Horse Chestnut) | sprouts and nuts |
| Buckthorn | Fruit, bark |
| Buttercup | sap, leaves, bulbs |
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| Cactus |
| Caladium – | whole plant |
| California tern | roots seeds |
| Calla Lily | Leaves |
| Carolina jasmine – | all parts |
| Castor Bean (Castor Oil) | Beans, Leaves |
| Challice Vine | All parts |
| Chenille | plant |
| Cherry | bark, twigs, leaves, pits |
| Cherry | seeds contain hydrocyanic acid |
| Cherry Laurel (Prunus Varieties) | all parts, seeds contain hydrocyanic acid |
| Cherry Tree | Bark, twigs,l eaves, pits |
| Chinaberry (Melia Azedarach) | berries are poisonous |
| Choke cherry – | all parts, especially the cherries |
| Christmas Berry (Heteromeles Arbutifolia, Toyon) | berries are poisonous |
| Christmas Candle | Sap |
| Colocasia | all parts |
| Columbine (Aquilegia) | all parts |
| Common Privet (Ligustrum) | black or blue wax coated berries and leaves |
| Coral Berry (Symphoricarpos) | seeds |
| Coral Plant | Seeds |
| Crpcus | all bulbs |
| Croton | seeds |
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| Daffodil | Bulbs |
| Daphne | Berries |
| Datura (Brugmansia) | flowers, berries, & seeds |
| Day lily | very poisonous to cats |
| Deadly Amanita | All parts |
| Deadly Nightshade (Solanum Nigrum) | all parts, unripe fruit & foliage |
| Death Camas | All parts |
| Delphinium | All parts |
| Destroying Angel (Amanita Phalloides, Death Cup) | all parts |
| Dieffenbachia | Leaves |
| Digitalis – | all parts |
| Dogwood (Cornus) | fruit slightly poisonous |
| Dumbcane (dieffenbachia) – | all parts |
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| Easter lily | very poisonous to cats |
| Egg Plant | All parts but fruit |
| Elderberry (Sambucus) | red fruit poisonous, black & blue fruit o.k. |
| Elephant Ear (Colocasia, Taro, Caladium) | stem & leaves |
| English Ivy | Berries, leaves |
| Euphorbia (Splurge, Gopher Plant, Mole Plant) | roots, sap |
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| False Henbano | All parts |
| Fly Agaric (Fly Amanita Mushroom) | whole plant |
| Four O'Clock | whole plant |
| Foxglove | Leaves, seeds |
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| Gelsemium (Carolina Jessamine) | whole plant |
| Gloriosa lily – | all parts |
| Golden Chain | All parts, especially seeds |
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| Hellebore (Ranunculaccea) | all parts |
| Hemlock (Tsuga) | all parts, especially roots |
| Hemlock, water | All parts, especially roots and seeds |
| Hemlosk, poison | All parts, especially roots and seeds |
| Henbane | Seeds |
| Holly | Berries |
| Honeysuckle | Leave, flowers |
| Horse Chestnut | Nuts, twigs |
| Hyacinth | Bulbs |
| Hydrangea | Flower bud |
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| Impatiens (Balsam, Touch-Me-Not, Snapweed) | whole plant |
| Indian Turnip(Jack-in-the-Pulpit) | All parts |
| Iris (Blue Flag) | Bulbs |
| Ivy (Hedera) | all parts |
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| Jack-in-the-pulpit – | all parts |
| Japanese laurel – | all parts |
| Jasmine | berries |
| Java Bean (Lima) | Uncooked bean |
| Jerusalam Cherry (Solanum Pseudocapsicum) | fruit & leaves |
| Jimsonweed | Leaves, seeds |
| Juniper (J.virginiana) | Needles, stems, berries |
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| Lanbkill (Kalmia Angustifolia, Sheep Laurel) | leaves |
| Lantana | Immature berries |
| Larkspur (Delphinium) | foliage & roots are dangerous, seeds may be fatal |
| Laurel | All parts |
| Lily of the Valley | All parts, including water |
| Lobelia | leaves |
| Locoweed | All parts |
| Locust | bark,leaves, seeds |
| Lords and Ladies | All parts |
| Lupine (Lupinus) | seeds |
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| Machineel | all parts |
| Marijuana | all parts |
| May Apple (Podophullum) | all parts |
| Mescal Bean | Seeds |
| Milkweed (Asciepias) | all parts, especially sap |
| Misteltoe | Berries |
| Moccasin FLOWER (Lady Slipper, Cypripedium Spectabiles) | all parts |
| Mock Orange | Fruit |
| Monkshood | Leaves, roots |
| Morning Glory | All parts |
| Mountain Laurek (Kalmia Latifolia) | young leaves & shoots, can be fatal |
| Mushrooms | wild types |
| Mustard – | roots and seeds |
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| Narcissus | Bulbs |
| Natal Cherry (Solanum) | berries |
| Nicotiana (Flowering Tobacco) | leaves |
| Nightshades (all) | Berries, leaves |
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| Oak | Acorns, foliage |
| Oleander – all parts |
| Oleaner | Leaves,branches,nectar of blossoms |
| Peach, | seeds |
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| Pear, | seeds |
| Peony (Paeonia) | all parts
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| Periwinkle (Vinca, Myrtle) | whole plant |
| Philodendron | Leaves, stem |
| Pikeweed | Leaves,roots,immature berries |
| Pine | sap |
| Pinks (Sweet William, Carnation, Dianthus) | all parts |
| Plum, | seeds |
| Poinsettia | Leaves, flowers |
| Poison Ivy | Sap |
| Poison Oak | Sap |
| Pokeweed (Phytolacca, Pokeberry) | roots are dangerous |
| Poppy (Papaver) | all except California Poppy can be dangerous |
| Potato | Eyes and new shoots |
| Privet | berries, leaves |
| Prunus (many varieties) | seeds, some parts |
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| Ranunculus | all parts |
| Redwood | sap (from decks also) |
| Rhododendron | All parts |
| Rhubarb | Leaves |
| Rosary Peas | Seeds |
| Rosemary (Rosemarius Officinalis) | leaves of certain varieties are poisonous |
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| Sage (Salvia) | leaves of certain varieties are poisonous |
| Scotchbroom (Cytinsus Scoparious) | seeds, invasive |
| Senecio | whole plant of some species |
| Skunk Cabbage | All parts |
| Snapdragon | all parts |
| Snow Drops | All parts, especially bulbs |
| Snow on Mountain | All parts |
| Solanum (Nightshade) | all, especially some berries |
| Squirrel Corn (Dicentra Canadensis, Bleeding Heart) | all parts |
| Stramonium (Jimson Weed, Datura) | all parts |
| SUMAC (Rhus) | all parts |
| Sweet Pea | Seeds and fruit |
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| TANSY (Tanacetum) | all parts |
| Taro – all parts |
| Tiger Lily | all parts |
| Toadstools | can be fatal |
| Tobacco | Leaves |
| Tomato | foliage & vines |
| Trumpet vine – all parts |
| Tulip | bulbs |
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| Virginia Creeper | Sap |
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| Wisteria | All parts |
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| Yam Bean | Roots, immature polds |
| Yew (American, English, Japanese) | Needles, seeds |
