Although its berries look juicy and tempting, the fruits and the root of pokeweed are toxic and should not be eaten. Pokeweed is considered a pest species by farmers but is nevertheless often grown as an ornamental plant. Its berries can be made into pokeberry ink as well.

The red Spider lily is a bright summer flower that is prevalent throughout Asia. Though its appearance is cheerful, it is said to symbolize final goodbyes, and legend has it that it would often appear when two people parted forever. In addition, ancient Buddhist writings indicate that the Lycoris radiata was used to guide the dead through a cycle of rebirth.

Golden dewdrops (Duranta erecta) is an ornamental sprawling shrub commonly found in subtropical and tropical gardens all over the world. Its gentle purple blossoms are often visited by butterflies and hummingbirds. Golden dewdrops is considered a weed in Australia, South Africa and certain parts of East Asia.

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.

Five-seeded plume-poppy (Macleaya cordata) is a plant that’s indigenous to Japan and China. The specific epithet of “cordata” in the genus name means “heart-shaped.” That’s because that's the way the leaves look. The leaves look similar to those of the opium poppy, a relative of five-seeded plume-poppy.

Many species within the Cycas revoluta genus are highly toxic to dogs - if you suspect your dog has ingested any part of a sago palm plant, you should contact a vet immediately. The Sago palm is a very common ornamental and is the most common culprit. These plants contain high concentrations of the cycasin toxin, which is found throughout their structures but is most concentrated in their seeds. Ingesting even a small amount of cycasin can cause vomiting and diarrhea. Larger amounts can cause damage to the intestines and liver, coma, or death.

If a dog eats any part of the japanese Iris (Iris ensata) plant, illness can become life-threatening, and immediate veterinary treatment should be sought. The highest concentration of toxins is present in the bulb. Poisoning symptoms can start with bloody stool, excessive drooling, and lethargy and should be taken very seriously. Caution should be had around all 200 varieties of Iris ensata.

True to this plant's reputation, consumption of jerusalem cherry 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.

Common corncockle (Agrostemma githago) is an annual that will grow to 91 cm tall. Its purple blooms flower from spring to summer with seeds ripening from summer to fall. Considered a weed in cultivated farm areas it can be a nice addition to the home garden. The rigid stems make it an excellent choice for a cut flower arrangement.

Crowdipper (Pinellia ternata) is a perennial, three-leafed herb that blooms in late summer. It is native to Japan, but it has become an invasive weed in the United States. Because it grows from a corm (a swollen, underground plant stem) several inches underground, crowdipper can be particularly difficult to control in gardens. Simple pulling will not suffice - the entire corm must be dug up if you wish to remove this plant!

Rough horsetail (Equisetum hyemale) is an evergreen perennial. An aggressive grower, it reproduces through spores and is non-flowering. It prefers full sun to partial shade and is pest resistant. It provides erosion control, grows well in wetlands and makes an interesting addition to water gardens. Expected height of 61 to 91 cm.

Bearded iris is known to cause contact dermatitis in some individuals. The most commonly reported symptom is minor skin irritation, typically lasting only a few minutes. This can result from contact with the seeds, roots, or sap of this plant. Furthermore, all parts of bearded iris are toxic when ingested, especially the roots. Symptoms typically including minor or moderate burning sensations, nausea, vomiting, abdominal pain, diarrhea, and fever. This plant is most often encountered in a garden context, where it is planted as an ornamental.

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.

Sun spurge (Euphorbia helioscopia) is a winter annual that grows along the ground in a variety of locations from gardens to wastelands. It features distinctive red colored stems with toothed leaves that emit a toxic milky sap when cut or torn. Pale yellow flowers bloom from spring to summer and give way to fruit. This plant is considered a weed.

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.

The lenten rose (Helleborus orientalis) has been cultivated since the Germans began to do so in the mid-1800s, with varieties being created in the United Kingdom shortly after. Between the 1920s and 1960s, there was little interest in its cultivation until Helen Ballard bred new varieties. They are blooming early in the year hence they get their name of "Lenten rose".

Spring starflower (Ipheion uniflorum) is a plant species known for its star-shaped flowers and tall stems. It grows in early spring and grows from bulbs and self-seeding. This species grows well when planted in mass plantings, border plantings, and rock gardens.

Poisoning symptoms from candle larkspur (genus Delphinium elatum) could become a medical emergency, as these plants are incredibly toxic to dogs. All parts contain toxic alkaloids, though these are usually most concentrated in the new, green growth of younger plants. Symptoms following ingestion are many and varied, ranging from excessive drooling, vomiting, diarrhea, lethargy, and stiffness to irregular heartbeat, seizures, respiratory difficulty or failure, paralysis or even death. Seek medical treatment for your dog if it has consumed candle larkspur, even if no symptoms are immediately present.

Sweet pea is a staple of flowering climbers and has been since the Victorian era. The sweet pea, which uses tendrils to climb when correct supports are available, grows to a height of 1.02 m – 2 m. The highly fragrant flowers are purple when found in the wild, but domesticated cultivars can be found in nearly every color.

Slender false garlic (Nothoscordum gracile) is a herbaceous perennial that will grow to 51 cm tall. It blooms from spring to summer with clusters of small white flowers with purple stripes and colorful green and gold stamens. Flowers bloom at the top of the stem. Considered a weed it is commonly found growing along sandy roadsides and woods. Attracts bees and other pollinators.