Following is a list of indoor and outdoor plants and trees which are hazardous to birds. It has been gathered from various sources and is by no means complete.

Harmful Plants (first source) Amaryllis - bulbs American Yew Avocado Azalea - leaves Balsam Pear - seeds, outer rind of fruit Baneberry - berries, root Bird of Paradise - seeds Black Locust - bark, sprouts, foliage Blue-green Algae - some forms toxic Boxwood - leaves, stems Buckthorn - fruit, bark Buttercup - sap, bulbs Caladium - leaves Calla Lily - leaves Castor Bean - also castor oil, leaves Chalice Vine/Trumpet vine Christmas Candle - sap Clematis/Virginia Bower Coral Plant - seeds Cowslip/Marsh Marigold Daffodil - bulbs Daphne - berries Datura - berries Deadly Amanita Death Camas Delphinium Deffenbachia/Dumb Cane - leaves Eggplant - fruit okay Elephants Ear/Taro - leaves, stem English Ivy berries, leaves English Yew False Henbane Fly Agaric Mushroom - Deadly Amanita Foxglove - leaves, seeds Golden Chain/Laburnum Hemlock - also water the plant is in Henbane - seeds Holly - berries Horse Chestnut/Buckeye - nuts, twigs Hyacinth - bulbs Hydrangea - flower bud Indian Turnip/Jack-in-Pulpit Iris/Blue Flag - bulbs Jack-in-the-Pulpit Japanese Yew - needles, seeds Java Bean - lima bean - uncooked Juniper - needles, stems, berries Lantana - immature berries Larkspur Laurel Lily of the Valley - also water the plant is in Lobelia Locoweed Lords and Ladies/Cuckoopint Marijuana/Hemp - leaves Mayapple - fruit is safe Mescal Beans - seeds Mistletoe - berries Mock Orange - fruit Monkshood/Aconite - leaves, root Morning Glory Narcissus - bulbs Nightshade - all varieties Oleander - leaves, branches, nectar Philodendron - leaves and stem Pointsetta - leaves, roots, immature Poison Ivy - sap Poison Oak - sap Pokeweed/Inkberry - leaf,root,young berries Potato - eyes, new shoots Privet Rhododendron Rhubarb - leaves Rosary Peas/Indian Licorice - seeds Skunk Cabbage Snowdrop	Snow on the Mountain/Ghostweed Sweet Pea - seeds, fruit Tobacco - leaves Virginia Creeper - sap Water Hemlock Western Yew Wisteria Yam bean - roots, immature roots Harmful Plants (other sources) Alacia Apricot Autumn Crocus/Meadow Saffron Beans - all types if uncooked Birch Bittersweet Nightshade Bleeding Heart/Dutchman's Breeches Bloodroot Bracken Fern Broomcorn Grass Candelabra Tree Cardinal Flower Cherry Tree - bark, twigs, leaves, pits Chinaberry Tree Crown of Thorns Croton Elderberry Euonymus/Spindle Tree False Hellebore Ficus (weeping) Firethorn/Pyracantha Four O'Clock Glory Bean Ground Cherry Honey Locust Honeysuckle Horsetail Indian Licorice Bean Ivy Jasmine Jimsonweed/Thornapple JerUKlem Cherry - berries Johnson Grass Kentucky Coffee Tree Lupines/Bluebonnet Mandrake Mango Tree - wood,leaves,rind-fruit safe Moonseed Mountain Laurel Mushrooms - several varieties Nectarine Nettles Nutmeg Oak - acorns, foliage Peach Peanuts - raw Pencil Tree Periwinkle Pigweed Pikeweed Pine needles - berries Plum Pothos Prune Rain Tree Ranunculus/Buttercup Red Maple Sandbox Tree Scarlet Runner Beans Snowflake Sorghum Grass Sorrel Sudan Grass Tansy Ragwort Vetch Yello Jasmine Yew (Amer,Engl,Japan) - needles, thistles	Parrot Cages UK