Ok how about talking about a comprehensive list
Here is an article in the book that the founder of BYC wrote:
Plants That Are Poisonous to Chickens
When you’re free-ranging chickens, acquaint yourself with the more common ornamentals and edibles that are mildly toxic to poisonous to chickens. You’ll find a variety of plants that have toxic or poisonous qualities for chickens.
Always err on the side of caution; if you suspect a plant is poisonous to your chickens, rid it from your garden. Many plants have toxic properties that act as a type of innate defense to help the plants to survive.
Poisonous ornamental plants
Even though many ornamental plants are mildly toxic or poisonous to chickens, they’re highly unlikely to eat these plants while free-ranging. While sheep, goats, and other livestock animals will eat toxic plants, chickens rarely do.
When chickens eat something poisonous, it’s usually because someone unintentionally fed them something poisonous or underfed them while they were confined and exposed to something poisonous.
The following are some of the more common ornamental plants potentially toxic, yet unlikely that chickens would freely eat these.
Azalea: Rhododendron spp.
Boxwood: Buxus spp.
Buttercup family: Ranunculaceae. This family includes anemone, clematis, delphinium, and ranunculus.
Cherry laurel: Prunus laurocerasus.
Daffodil: Narcissus spp.
Daphne: Daphne spp.
Foxglove: Digitalis spp.
Honeysuckle: Lonicera spp.
Hydrangea: Hydrangea spp.
Ivy: Hedera spp.
Jasmine: Jasminum spp.
Lantana: Lantana spp.
Lily of the valley: Convallaria majalis.
Mexican poppy: Argemone mexicana
Monkshood: Aconitum napellus.
Mountain laurel: Kalmia latifolia.
Oleander: Nerium oleander.
Rhododendron: Rhododendron spp.
Sweet pea: Lathyrus spp.
Tobacco: Nicotiana spp.
Wisteria: Wisteria spp.
Yew: Taxus spp.
Poisonous edible plants
The following list contains suggestions for edibles to avoid with hand-feeding and free-ranging chickens:
Avocado skin and pits contain persin, which is toxic to chickens.
Avoid citrus juice and skins.
Don’t give chickens any edible containing salt, sugar, coffee, or liquor.
Uncooked raw or dried beans contain hemaglutin, which is poisonous to chickens.
Raw green potato skins contain solanine, which is poisonous to chickens.
Onions are a poor food to give to chickens because onions flavor eggs. Large quantities of onions can be harmful to chickens, affecting their red blood cells, causing hemolytic anemia or Heinz anemia.
Avoid feeding or free-ranging chickens specific unshelled nuts of walnuts (Juglans spp.), black walnuts (Juglans nigrs), hazelnuts (Corylus), and pecans (Carya illinoinensis).
Don’t give your chickens leaves of rhubarb, potato, or tomato plants.
Deadly poisonous plants found in pastures
These plants are not only extremely poisonous to poultry, but also to many other types of livestock and humans. This is not an inclusive list, and be aware that these plants can be found in other areas besides pastures, such as meadows, wilderness areas, and sometimes in gardens as volunteers. These are the types of plants you absolutely should never expose your chickens to:
Black locust: Robinia pseudoacacia.
Bladderpod: Glottidium vasicarium.
Death Camas: Zigadenus spp.
Castor bean: Ricinus communis.
European black nightshade: Solanum nigrum.
Corn cockle: Agrostemma githago.
Horsenettle: Datura stramonium.
Milkweed: Asclepias tuberosa. And other varieties.
Mushrooms: Amanita spp. Death Cap, Destroying Angel, Panther Cap. Extremely deadly and poisonous if ingested.
Jimsonweed: Datura stramonium.
Poison hemlock: Conium maculatum.
Pokeberry: Phytolacca americana.
Rosary pea: Arbus precatorius.
Water Hemlock: Cicuta spp.
White snakeroot: Ageratina altissima.
Here is a list from right here on BYC:
AUSTRALIAN UMBRELLA TREE
BEANS: (CASTOR, HORSE, FAVA, BROAD, GLORY, SCARLET RUNNER,
MESCAL, NAVY, PREGATORY)
BIRD OF PARADISE
BLEEDING HEART OR DUTCHMAN'S BREECHES
BULB FLOWERS: (AMARYLLIS, DAFFODIL, NARCISSUS, HYACINTH & IRIS)
CHALICE (TRUMPET VINE)
CHINA BERRY TREE
CLEMATIS (VIRGINIA BOWER)
COFFEE BEAN (RATTLEBUSH, RATTLE BOX & COFFEEWEED)
DATURA STRAMONIUM (ANGEL'S TRUMPET)
DIEFFENBACHIA (DUMB CANE)
ELEPHANT EAR (TARO)
EUCALYPTUS (DRIED, DYED OR TREATED IN FLORAL ARRANGEMENTS)
EUONYMUS (SPINDLE TREE)
FELT PLANT (MATERNITY, AIR & PANDA PLANTS)
GRASS: (JOHNSON, SORGHUM, SUDAN & BROOM CORN)
HEATHS: (KALMIA, LEUCOTHO, PEIRES, RHODODENDRON, MTN. LAUREL,
BLACK LAUREL, ANDROMEDA & AZALEA)
HEMLOCK: (POISON & WATER)
IRIS IVY: (ENGLISH & OTHERS)
KY. COFFEE TREE
LANTANA (RED SAGE)
LILY OF THE VALLEY
LOCOWEED (MILK VETCH)
LOCUSTS, BLACK / HONEY
LORDS & LADIES (CUCKOOPINT)
MILKWEED, COTTON BUSH
NIGHTSHADES: (DEADLY, BLACK, GARDEN, WOODY, BITTERSWEET,
EGGPLANT, JERUSALEM CHERRY)
PHILODENDRONS: (SPLIT LEAF, SWISS CHEESE, HEART-LEAF)
POISON OAK: (WESTERN & EASTERN)
RED SAGE (LANTANA)
ROSARY PEA SEEDS
SAND BOX TREE
SPURGES: (PENCIL TREE, SNOW-ON-MTN, CANDELABRA, CROWN OF THORNS)
STAR OF BETHLEHEM
SWISS CHEESE PLANT (MONSTERA)
WHITE CEDAR, CHINA BERRY
another great discussion on poisonous plants
I for instance have Loco Weed on my property. It looks like pea pods with a papery shell. pretty plant. but Toxic to livestock.... Even if they eat a whole plant it may only cause them diarrhea... If they are starved ant this is the only plant available horses cows and sheep will eat it excluseively Loco Weed causes irreversable damage to their liver and brain. they have to be put down because they are a danger to themselves and us caregivers.
As an amateur herbal enthusiast my property is covered with medicinals.... I read read read.... I read on the internet and wont take info as gospel till i hear it from several sources. Even if I could identify a medicinal herb I would never partake of it because there is a science to dosage and use just as in Pharmacology. Many medicinals are toxic to some degree.
For instance Apples specifically their pits. "They contain amygdalin, a substance that releases cyanide when it comes into contact with human digestive enzymes." from the following article:
The conclusion is the amount ingested is far away from being enough to cause issues. If you are concerned err on the side of caution...
By the way Peach Apricot and many Drupes have the same chemical amygdalin. we dont eat the pits because the meat is bitter....
Almond is also a Drupe.... with inedible fruit.
some other unexpected drupes are
There are also sites MERK is one
they offer a spread sheet on Range plants as well.,
But PLEASE everyone dont take my word for it or any one single person for that matter.... do your own research.... within your own sphere of habitat. Most animals have excellent taste receptors and listen to them. Chickens are one of them.
I have done the research for my area of the Sonoran Desert Yep San Diego County has a portion of that desert.
deb "Yes I am aware that Parsley and Cilantro are on the second list"
Edited by perchie.girl - 5/28/16 at 7:52pm