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Poisonous/Toxic Plants
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.
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
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
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
Daffodil Bulbs
Daphne Berries
Datura (Brugmansia)flowers, berries, & seeds
Day lily very poisonous to cats
Deadly AmanitaAll parts
Deadly Nightshade (Solanum Nigrum)all parts, unripe fruit & foliage
Death CamasAll parts
DelphiniumAll parts
Destroying Angel (Amanita Phalloides, Death Cup)all parts
DieffenbachiaLeaves
Digitalis all parts
Dogwood (Cornus)fruit slightly poisonous
Dumbcane (dieffenbachia) all parts
Easter lily very poisonous to cats
Egg PlantAll parts but fruit
Elderberry (Sambucus)red fruit poisonous, black & blue fruit o.k.
Elephant Ear (Colocasia, Taro, Caladium)stem & leaves
English IvyBerries, leaves
Euphorbia (Splurge, Gopher Plant, Mole Plant)roots, sap
False HenbanoAll parts
Fly Agaric (Fly Amanita Mushroom)whole plant
Four O'Clockwhole plant
FoxgloveLeaves, seeds
Gelsemium (Carolina Jessamine)whole plant
Gloriosa lily all parts
Golden ChainAll parts, especially seeds
Hellebore (Ranunculaccea)all parts
Hemlock (Tsuga)all parts, especially roots
Hemlock, waterAll parts, especially roots and seeds
Hemlosk, poisonAll parts, especially roots and seeds
HenbaneSeeds
HollyBerries
HoneysuckleLeave, flowers
Horse ChestnutNuts, twigs
HyacinthBulbs
HydrangeaFlower bud
Impatiens (Balsam, Touch-Me-Not, Snapweed)whole plant
Indian Turnip(Jack-in-the-Pulpit)All parts
Iris (Blue Flag)Bulbs
Ivy (Hedera)all parts
Jack-in-the-pulpit all parts
Japanese laurel all parts
Jasmine berries
Java Bean (Lima)Uncooked bean
Jerusalam Cherry (Solanum Pseudocapsicum)fruit & leaves
JimsonweedLeaves, seeds
Juniper (J.virginiana)Needles, stems, berries
Lanbkill (Kalmia Angustifolia, Sheep Laurel)leaves
LantanaImmature berries
Larkspur (Delphinium)foliage & roots are dangerous, seeds may be fatal
LaurelAll parts
Lily of the ValleyAll parts, including water
Lobelialeaves
LocoweedAll parts
Locust bark,leaves, seeds
Lords and LadiesAll parts
Lupine (Lupinus)seeds
Machineel all parts
Marijuana all parts
May Apple (Podophullum)all parts
Mescal BeanSeeds
Milkweed (Asciepias)all parts, especially sap
MisteltoeBerries
Moccasin FLOWER (Lady Slipper, Cypripedium Spectabiles)all parts
Mock OrangeFruit
MonkshoodLeaves, roots
Morning GloryAll parts
Mountain Laurek (Kalmia Latifolia)young leaves & shoots, can be fatal
Mushroomswild types
Mustard roots and seeds
NarcissusBulbs
Natal Cherry (Solanum)berries
Nicotiana (Flowering Tobacco)leaves
Nightshades (all)Berries, leaves
OakAcorns, foliage
Oleander all parts
OleanerLeaves,branches,nectar of blossoms
Peach,seeds
Pear,seeds
Peony (Paeonia)all parts
Periwinkle (Vinca, Myrtle)whole plant
PhilodendronLeaves, stem
PikeweedLeaves,roots,immature berries
Pine sap
Pinks (Sweet William, Carnation, Dianthus)all parts
Plum,seeds
PoinsettiaLeaves, flowers
Poison IvySap
Poison OakSap
Pokeweed (Phytolacca, Pokeberry)roots are dangerous
Poppy (Papaver)all except California Poppy can be dangerous
PotatoEyes and new shoots
Privet berries, leaves
Prunus (many varieties)seeds, some parts
Ranunculus all parts
Redwood sap (from decks also)
RhododendronAll parts
RhubarbLeaves
Rosary PeasSeeds
Rosemary (Rosemarius Officinalis)leaves of certain varieties are poisonous
Sage (Salvia)leaves of certain varieties are poisonous
Scotchbroom (Cytinsus Scoparious)seeds, invasive
Seneciowhole plant of some species
Skunk CabbageAll parts
Snapdragon all parts
Snow DropsAll parts, especially bulbs
Snow on MountainAll 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 PeaSeeds and fruit
TANSY (Tanacetum)all parts
Taro all parts
Tiger Lily all parts
Toadstoolscan be fatal
TobaccoLeaves
Tomatofoliage & vines
Trumpet vine all parts
Tulip bulbs
Virginia CreeperSap
WisteriaAll parts
Yam BeanRoots, immature polds
Yew (American, English, Japanese)Needles, seeds