Poison Hemlock is an extremely poisonous herbaceous flowering plant with a green or green and red hollow stem, finely divided triangular leaves, and clusters of very small white flowers that branch outward from the from the center.

Water hemlocks are Poisonous with thick roots, skinny long leaves, and clusters of small white flowers.

Holly is an evergreen and is typically used as an ornamental plant for holidays like Christmas. A few types of holly have red berries and glossy green leaves that curl and have multiple sharp points, or slightly softer leaves and small white flowers.

Horehound is a grey-leaved herbaceous perennial plant historically used for medicinal purposes. This plant is about 1 1/2 ft tall with small densely crinkled leaves covered in tiny hairs, resembling mint leaves. They have clusters of small white flow

Horse Chestnut is a species of flowering plant in the lychee family. This plant can grow extremely tall with large bright green leaves and white flowers with a yellow or pink floral base. The fruit is a green spiky shell containing one brown seed wit

Horsetail reeds are bright green grass-like reeds that resemble small bamboo.

The hosta has long ridged leaves that curl. The plant produces light purple flowers.

Indian or India Rubber is a common name for the natural rubber that is produced from certain trees in the sap. The latex produced from the sap is refined to a rubber. These rubber trees are native to South America and India.

Dogbane, Indian Hemp, and others of the Apocynum cannabinum family can grow up to 6 1/2 ft. tall with reddish stem that contain a white latex sap and clusters of small white flowers. The leaves are long and green, smooth around the edges, and have ti

Inkberry, also known as Appalachian tea and Gallberry, is a species of evergreen holly typically found in the eastern part of North America. Inkberry has spineless, glossy, dark green leaves and small greenish white flowers that bloom in spring. Gall

Japanese Euonymus is a species of flowering plant native to Japan, Korea, and China. This shrub can grow between 2-8 meters tall with oval, finely serrated leaves, and tiny greenish-white flowers.

The Japanese Yew is an evergreen tree or large shrub native to Japan, Korea, and China. The leaves resemble thin, flat pine needles, with red berries. This plant is known to be very toxic.