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Toxic Plants






Everyone wants a healthy pond full of beautiful Koi and lovely plants but do you know which plants are DEADLY to your Koi?


Keeping your Koi healthy is the Most Important part of being a Koi owner (and what this site is dedicated to).

You are always careful to make sure your water is stable and you do not over feed your fish but have you ever thought of the hidden dangers?

Pond owners should exercise caution when situating all plantings as any plant debris that enters the pond, toxic or not, will contribute to the decline of your water quality.

The seeds of most plants can swell and plug up the digestive tract of the Koi. A partial list of the plants or parts of plants that have been reported as having some toxicity to Koi (and pets and people) for various reasons include:


Plant NamePart
ACOKANTHERAfruit and flowers
ACONITUMroots, flowers, and leaves
ALLAMANDA all parts
ALLSPICE leaves, seeds
ALOCASIA leaves and stems
ALOE leaves
AMARYLLISbulbs contain alkaloids
ANENOMEall parts
ANGEL TRUMPET TREE (Datura Arborea)flowers and leaves
ANTHURIUM all parts
APPLEall parts, seeds contain hydrocyanic acid
APRICOTall parts, seeds contain hydrocyanic acid
ATROPA BELLADONNAall parts, especially black berries
AUTUMN CROCUS (C. Sativus, Saffron Crocus)bulbs
AZALEAS (Rhododendorn)all parts can be fatal
BANEBERRY (Actaea, Doll's Eyes)red or white berries, roots and foliage
Balsam Pear Seedsouter rind of fruit (Momordica charantia)
BEACH PEA (Lathyrus Maritimus)stems
BETEL NUT PALMall parts
BIRD OF PARADISE BUSH (Caesalpinia)seeds
BITTERSWEET (Celastrus)berries
BLACK LOCUST (Robinia Pseudoacacia)bark, sprouts, and foliage are poisonous
BLACK WALNUT hulls
BLEEDING HEART (Dicentra, Dutchman's Breeches)foliage and roots
BLUEBONNETS (Lupinus) all parts
BOTTLEBRUSH (Callistemon, possibly Melaleuca) flowers
BOXWOOD (Buxus Sempervirens) all parts
BUCKEYE (Aesculus, Horse Chestnut) sprouts and nuts
BUTTERCUP (Ranuculus, Crowfoot)all parts
CALADIUMall parts
CALIFORNIA TERNroots seeds
CALLA LILY (Zantedeschia) all parts
CARDINAL FLOWERall parts
CAROLINA JESSAMINE (Gelsemium)All parts
CASTOR BEAN (Ricinus Communis)seeds can be fatal
CHERRYpits
CHERRY LAUREL (Prunus Varieties) all parts, seeds contain hydrocyanic acid
CHINABERRY (Melia Azedarach)berries are poisonous
CHOKE CHERRYall parts
CHRISTMAS BERRY (Heteromeles Arbutifolia, Toyon) berries are poisonous
COLOCASIAall parts
COLUMBINE (Aquilegia)all parts
COMMON PRIVET (Ligustrum)black or blue wax coated berries and leaves
CORAL BERRY (Symphoricarpos)seeds
COTONEASTERall parts
CROCUS all bulbs
CROTONseeds
DAPHNE berries can be fatal
DAFFODIL (Narcissus)bulbs may be fatal
DATURA (Brugmansia)flowers, berries, & seeds
DEATH-CAMAS (Sygadenus Venous)all parts poisonous, roots are deadly
DEADLY NIGHTSHADE (Solanum Nigrum) all parts, unripe fruit and foliage
DELPHINIUM (Larkspur annual)all parts
DESTROYING ANGEL (Amanita Phalloides, Death Cup) all parts
DIEFFENBACHIA (Dumb Cane)all parts, especially the sap
DIGITALISall parts
DOGWOOD (Cornus)fruit slightly poisonous
EGGPLANT all but fruit
ELDERBERRY (Sambucus)red fruit poisonous, black and blue fruit o.k.
ELEPHANT EAR (Colocasia, Taro, Caladium) all parts
ENGLISH IVY (Hedera Helix) berries
EUPHORBIA (Splurge, Gopher Plant, Mole Plant) roots, sap
FALSE HELLEBORE (Veratrun Viride and other species) all parts poisonous, root deadly
FOXGLOVE (Digitalis Purpurea) all parts can be fatal
FLY AGARIC (Fly Amanita Mushroom) whole plant
FOUR O'CLOCK whole plant
GELSEMIUM (Carolina Jessamine) whole plant
GLORIOSA LILYall parts
GOLDEN CHAIN seeds and pods may be fatal
HELLEBORE (Ranunculaccea) all parts
HEMLOCK (Tsuga) all parts, especially roots
HENBANE all parts
HOLLY (Ilex Aquifolium, Opaca, Vomitoria) leaves and berries
HONEYSUCKLEflowers and leaves
HORSE CHESTNUT (Aesculus, Buckeye) all parts
HORSETAIL (Equisetum Hyemale) all parts
HYACINTH bulbs can be fatat
HYDRANGEA whole plant
IMPATIENS (Balsam, Touch-Me-Not, Snapweed) whole plant
INDIAN TURNIPall parts
IRIS underground stemt, leaves, and rhizomes
IVY (Hedera) all parts
JACK-IN-THE-PULPIT (Arisaema Triphylla) root is irritant and astringent
JAPANESE LAURELall parts
JASMINE, YELLOW all parts
JAVA (LIMA) BEANuncooked bean
JERUSALEM CHERRY (Solanum Pseudocapsicum) fruit and leaves
JESSAMINE (Gelsemium Sempervirens) berries are fatal
JIMSON WEED (Datura Stramomium, Thorn Apple) all parts
LAMBKILL (Kalmia Angustifolia, Sheep Laurel) leaves
LANTANA CAMARA (Red Sage)all parts, green berries are fatal
LARKSPUR (Delphinium)foliage and roots are dangerous, seeds may be fatal
LAUREL (Primus varieties)all parts can be fatal
LILY (Lilium) some varieties bulbs
LILY-OF-THE-VALLEY (Convallaria Majalis) all parts
LOBELIA (Cardinal Flower) all parts
LOCOWEED (Astragalus, Oxytropis) all parts
LOCUSTbark,leaves, seeds
LUPINE (Lupinus) seeds
MACHINEEL all parts
MARIJUANA all parts
MAY APPLE (Podophullum) all parts
MESCAL (Peyote) all parts
MILKWEED (Asciepias) all parts, especially sap
MIMOSAall parts
MISTLETOE all parts, berries can be fatal
MOCCASIN FLOWER (Lady Slipper, Cypripedium Spectabiles) all parts
MOCK ORANGE (Philadelphus) all parts
MONKSHOOD (Aconitum) foliage and fleshy roots
MORNING GLORIES (Ipomea) all parts
MOUNTAIN LAUREL (Kalmia Latifolia) young leaves and shoots, can be fatal
MUSHROOMS wild types
MUSTARDroots and seeds
NARCISSUS (Daffodil) bulbs can be fatal
NATAL CHERRY (Solanum) berries
NICOTIANA (Flowering Tobacco) leaves
NIGHTSHADE (European Bittersweet, Horse Nettle) all, especially unripe berries
OAK foliage and acorns
OLEANDER (Nerium Oleander) All parts poisonous including smoke if burned
PEACH see Cherry Laurel, seeds
PEAR see Cherry Laurel, seeds
PEONY (Paeonia) all parts
PERIWINKLE (Vinca, Myrtle) whole plant
PHILODENDREN leaves and sap
PINE sap
PINKS (Sweet William, Carnation, Dianthus) all parts
PLUM see Cherry Laurel, seeds
POKEWEED (Phytolacca, Pokeberry) roots are dangerous
POINSETTIA (Euphorbia Pulcherrima) all parts, leaves and sap can be fatal
POISON IVY (Rhus Radicans) all parts
POISON OAK (Rhus Diversioba, Rhus Toxicondendron) all parts
POPPY (Papaver) all except California Poppy can be dangerous
POTATO sprouts and foliage can be fatal particularly ornamental varieties
PRIVET (Ligustrum) leaves and fruit
PRUNUS (many varieties) seeds, some parts
RANUNCULUSall parts
REDWOOD sap, (from decks also)
RHODODENDRON (Azalea) all parts can be fatal
RHUBARB (Rhenum Rhaponticum) all parts
ROSEMARY (Rosemarius Officinalis) leaves of certain varieties are poisonous
SAGE (Salvia) leaves of certain varieties are poisonous
SCOTCHBROOM (Cytinsus Scoparious) seeds, invasive
SENECIO whole plant of some species
SNAPDRAGON (Antirrhinum) all parts
SNOWDROP (Galanthus) 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 (Lathyrus) stems
TANSY (Tanacetum) all parts
TARO (Colocasia, Elephant's Ear) stem and leaves
TIGER LILY (Lilium Tigrinum) all parts
TOADSTOOLS can be fatal
TOBACCO all parts
TOMATO foliage and vines
TRUMPET VINEall parts
TULIP (Tulipa) bulbs of some varieties
VINCA (PERIWINKLE) all parts
YEW foliage, bark, seeds







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