Creeping buttercup can be severely toxic to dogs; you should seek immediate veterinary attention if you believe your dog has eaten or come into contact with a plant of this type. All parts of these plants contain ranunculin, a toxin that is poisonous when swallowed and also can irritate skin, causing redness or itch. Ingestion symptoms ranging from excessive drooling, vomiting, diarrhea, weakness, and loss of appetite to paralysis, seizures, jaundice, spasms, collapse, or even death.

Cow parsnip (Heracleum sphondylium) is a species of flowering perennial herb related to parsley and fennel. Its specific epithet, "sphondylium," means "vertebrate," and references its segmented appearance. This species produces extremely large amounts of nectar and thus attracts many bees.

All parts of common foxglove are severely toxic to humans when ingested, including the flowers, leaves, roots, and stem. Symptoms of poisoning may include nausea, vomiting, diarrhea, stomach pain, headache, irregular or slow heart rate, tremors, color hallucinations, and convulsions. Consumption of can be fatal. Common foxglove is sometimes cultivated as an ornamental plant in gardens, and poisoning is most likely to occur from accidental consumption by children.

All parts of common columbine, including the stem, leaves, flowers, and seeds, are toxic when they are ingested raw. Contact with the plant's sap may also lead to dermatitis (skin irritation and inflammation). The symptoms from common columbine poisoning are likely to cause only mild to moderate effects, but the symptoms are not well-known, since there are few documented cases of it. Adverse effects are most likely to occur from accidental ingestion.

All parts of the evergreen spindle are considered toxic if ingested in large quantities. Symptoms can range from mild to life-threatening including vomiting, weakness, diarrhea, chills, convulsions, and coma. Since these plants are commonly used as ornamental hedges, you should be mindful of any children who may encounter the plant, be attracted by its colorful leaves and flowers, and may be tempted to eat them.

Hairy willowherb (Epilobium hirsutum) is a species of weed that is difficult to eradicate. It is not known to be toxic, but the sale of this plant or its seeds has been banned in some areas. This is because its dense, aggressive growth habits can crowd out and destroy other native beneficial plants.

Hyacinthus orientalis is one of the heralds of spring. The name common hyacinth comes from the Greek name Hyacinthus. According to Greek legend, Hyacinthus was admired by both Apollo and Zephyrus. Hyacinthus ended up being killed out of jealousy and a flower bloomed on the spot where his blood was spilled. Apollo named the flower after his lost love.

True to this plant's reputation, consumption of potato can be extremely toxic to dogs, and warrants immediate veterinary attention. All parts of these plants contain several toxic substances which can cause loss of appetite, excessive drooling, vomiting, diarrhea, dilated pupils, confusion, behavioral changes, and weakness. In more severe cases, difficulty breathing, a lowered heart rate, coma, or even death may occur, so treat it as a medical emergency if your pet has come into contact with this plant.

Wild daffodils have low-level toxicity when the leaves or bulbs are ingested. The bulbs, however, are the most toxic part of the plant. If the bulbs are ingested, symptoms may include vomiting, diarrhea, and excessive salivation. If a large quantity is consumed, convulsions, low blood pressure, tremors, and cardiac arrhythmias may occur. Poisoning is most likely to occur from accidental ingestion by children, as wild daffodils are grown in gardens around the world.

Cuckoo pint (Arum maculatum) is a perennial that will grow to 51 cm tall. It blooms in spring with male and female flowers that spring be yellow or purple. Male flowers have tiny hairs to trap insects that are attracted by the scent of the blossoms. This entrapment covers the insect in pollen before it can escape to pollinate other flowers. Female flowers give way to bright red berries in summer that are highly poisonous.

Pontic rhododendron (Rhododendron ponticum) is a dense shrub species that is one of the most extensively cultivated Rhododendron species in western Europe. Pontic rhododendron is native to southern Europe and southwest Asia. This species is widely cultivated for ornamental purposes, and considered invasive in western Europe. Honey produced from the pollen of this species is poisonous.

Plants of genus Buxus are widely present around the world as а hedge or garden ornamental plants, but they contain alkaloids, most notably buxin, which are toxic to animals.

If either ingested or touched, dieffenbachia can cause negative reactions. The symptoms range from moderate to severe and can be dangerous if airways are blocked. Due to the calcium oxalate contained in this plant, its leaves and sap have toxic properties. When ingested, they can induce symptoms such as lip and tongue swelling, drooling, speech loss, and difficulty breathing; when touched, they can cause a painful skin rash or eye irritation. Since these plants are often found indoors as decorative plants, be careful when keeping them around small children. Always wear gloves when handling this plant.

Japanese skimmia (Skimmia japonica) is an evergreen shrub native to East and Southeast Asia. This plant is composed of aromatic cream-colored flowers, crimson berries, and velvety deep green foliage. These decorative features are aesthetically pleasing when the plant is placed in shady environments. This low maintenance sweet-scented plant thrives in moist, well-drained soil in moderate to full shade.

Japanese pieris (Pieris japonica) is an evergreen shrub that produces chains of small flowers. But be careful, it can cause seizures and temporary blindness if consumed by animals or people. Even so, is sometimes grown in the foundation portion of gardens along with other shrubs.

The calla lily is a well-known ornamental plant with several cultivars receiving the Royal Horticultural Society's Award of Garden Merit. The most calla lily cultivars include 'Crowborough', 'Green Goddess', 'Pink Mist', and 'Red Desire'. They are popular as a cut flower or a rhizomatous herb in warm gardens.

The wallflower (Erysimum cheiri) is a spindly, flowering herb with a penchant for growing in cliff crevices. It blooms in spring with an abundance of fragrant flowers that can range in shades of yellow, orange, red, purple, brown, or white. Many gardeners prefer to plant wallflower as a biennial, sowing seeds one year in order to protect the roots from a common infection known as clubfoot.

Evergreen azalea are members of the Rhododendron genus, all of which contain varying levels of a toxin known as Grayanotoxin in all tissues. Physical contact can cause a rash in sensitive people, the pollen can irritate mucus membranes, and ingesting it can cause nausea, vomiting, arrhythmia, low blood pressure, and hallucinations in humans. Grayanotoxin is so strong that even the amounts contained in honey made from Rhododendron pollen can have negative effects.

Greater creeping spearwort can be severely toxic to dogs; you should seek immediate veterinary attention if you believe your dog has eaten or come into contact with a plant of this type. All parts of these plants contain ranunculin, a toxin that is poisonous when swallowed and also can irritate skin, causing redness or itch. Ingestion symptoms ranging from excessive drooling, vomiting, diarrhea, weakness, and loss of appetite to paralysis, seizures, jaundice, spasms, collapse, or even death.

Tansy ragwort is a biennial that is classified in many areas of the United States as a noxious weed. The tansy ragwort is poisonous to livestock, pets, and humans. This plant is found in sunny open areas like pastures and meadows. It has bright yellow flowers and grows 61 to 122 cm tall.