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Azaleas, Castor Bean, Daffodils, Day Lilies, Easter Lilies, Irises, lantana, poinsettias, laurels, sago palm, wisteria, these are all poisonous to animals.

As for people...

Hyacinth, Narcissus, Daffodil Bulbs Nausea, vomiting, diarrhea. May be fatal.

Oleander Leaves, branches Extremely poisonous. Affects the heart, produces severe digestive upset and has caused death.

Dieffenbachia (Dumb Cane), Elephant Ear All parts Intense burning and irritation of the mouth and tongue. Death can occur if base of the tongue swells enough to block the air passage of the throat.

Rosary Pea, Castor Bean Seeds Fatal. A single Rosary Pea seed has caused death. One or two Castor Bean seeds are near the lethal dose for adults.

Laurels, Rhododendrons, Azaleas All parts Fatal. Produces nausea and vomiting, depression, difficult breathing, prostration and coma.

Jasmine Berries Fatal. Digestive disturbance and nervous symptoms.

Lantana Camara (Red Sage) Green berries Fatal. Affects lungs, kidneys, heart and nervous system. Grows in the southern U.S. And in moderate climates.

Yew Berries, foliage Fatal. Foliage more toxic than berries. Death is usually sudden without warning symptoms.

Wild and cultivated cherries Twigs, foliage Fatal. Contains a compound that releases cyanide when eaten. Gasping, excitement and prostration are common symptoms.

Oaks Foliage, acorns Affects kidneys gradually. Symptoms appear only after several days or weeks. Takes a large amount for poisoning.

Elderberry All parts, especially roots Children have been poisoned by using pieces of the pithy stems for blowguns. Nausea and digestive upset.

Mistletoe Berries Fatal. Both children and adults have died from eating the berries.

Water Hemlock All parts Fatal. Violent and painful convulsions. A number of people have died from hemlock.

Buttercups All parts Irritant juices may severely injure the digestive system.

Nightshade All parts, especially the unripened berry Fatal. Intense digestive disturbance and nervous symptoms.

Poison Hemlock All parts Fatal. Resembles a large wild carrot.

Jimson Weed (Thorn Apple) All parts Abnormal thirst, distorted sight, delirium, incoherence and coma. Common cause of poisoning. Has proved fatal.

These were just a few from a list of common Texas plants.

You can also die from drinking too much water.