The castor bean is important for its oil which is used as a lubricant, biodiesel ingredient, and rodent repellent, among other applications. The plants are now commercially planted globally, with India producing nearly 75% of the world's castor oil. Castor beans cannot be eaten because they contain a potent poison that's released if the seed is broken.

Wild Petunia (Ruellia strepens) is a perennial wildflower commonly found in woodland areas and growing along streams. It produces showy lavender-blue trumpet-shaped flowers from spring through summer attracting butterflies and hummingbirds to its nectar. It is drought tolerant.

Uhaloa (Waltheria indica) is a small shrub in the mallow family that can be found growing in tropical regions across the world. Not a particularly showy plant, uhaloa has small white flowers that grow in clusters. Because it can tolerate drought, salt spray, and slightly salty soil, the species is sometimes used in ecological restoration projects.

Horseshoe geranium can be identified by looking for horseshoe-shaped patterns of color, or “zones” within the leaves. The bright blooms are attractive to bees, butterflies, and birds and come in many colors, including red, pink, salmon, and more. These plants are easy to grow outside in your yard or indoors in containers.

The grain of grain sorghum is utilized for human consumption, animal feed, and ethanol manufacturing. It is commonly grown in tropical and subtropical countries, originating in Africa. The grain is used to make liquor, animal feed, and bio-based ethanol, among other things.

Native to eastern Mexico, the Selenicereus spinulosus or vine-like moonlight cactus produces aerial roots and fragrant flowers that bloom mid-spring to early summer. Its yellow, globular fruit is covered with yellowish spines. Use extreme caution when handling because of the spines.

The sourplum tree is a sparsely branched shrub or small tree around 2 m in height with a shapeless untidy crown. It has been known to grow to about 6 m in height. The branches are either smooth or covered with flattened hairs and armed with spines at their bases. The bark of the tree is grayish-brown to black in colour, and is longitudinally fissured. The leaves are simple, alternate, and elliptic in shape. When the tree flowers, the flowers are greenish to creamy white in colour although they have been seen to be sometimes tinged pink or red. The sourplum fruit itself is ellipsoidal in shape. The skin is smooth and starts green, and then ripens to an orange or red. Similarly the flesh is also orange or red in colour, and when ripe has a juicy pulp. The sourplum is 3.5 cm in length and 2.5 cm in diameter. The seed is smooth, ellipsoid, and yellow-brown to red in colour. The seed is hard and around 2.5 cm in length.

Common rush (Juncus effusus) is a soft, grass-like clumping perennial also known as soft rush. Common rush grows well in standing water or rich moist soil. It grows in small clumps that look like tall grass and spreads by rhizomes. It can be grown in an aquatic setting or indoors as a houseplant.

Lambsquarters has many other names, including pigweed, goosefoot, and bacon weed. This plant seems to appear out of nowhere and is considered by many to be a pesky weed. However, the greens of this plant are edible, can be prepared similar to spinach, and are packed with nutrients.

Sisal (Agave sisalana) is a succulent plant whose yellow flowers bloom along a stalk rising up to 9 m tall and have an unpleasant scent. The flowers, stalk, basal rosette and sap of this plant are edible. Plant in full sun outdoors or place in a bright, sunny location indoors.

Zonal geranium (Pelargonium hortorum) is an annual plant species that looks similar in appearance to other geraniums. The zonal geranium can be distinguished by its zone of red, blue or purple striping through the middle of the leaf. This species is typically a one-season bloomer, unlike other geraniums that are perennial growers and bloom year round. Zonal geranium blooms come in a variety of colors that include red, pink, burgundy, salmon and white.

Box elder (Acer negundo) is a type of maple tree native to North America, but which is now found throughout the world. It is a hardy, medium-to-large tree that grows quickly and has a relatively short lifespan of up to 60 years. Older trees are prone to storm damage. Box elder wood is relatively flimsy because the tree grows so fast.

Dragon arum (Dracunculus vulgaris) is an aroid species native to the Balkans. This species is also called the black arum, the voodoo lily, the snake lily, the stink lily, the black dragon, the black lily, and dragonwort. Dragon arum grows best in full sunlight.

Corn plant (Dracaena fragrans) is an evergreen, slow-growing perennial shrub native to tropical Africa. Also, it is a classic houseplant, grown in Europe since the 1800s. Its glossy green foliage that resembles corn leaves grow on top of a thick cane, which is why the plant is sometimes called “false palm tree.”

Looking like a miniature fairy tale tree, jade plant is one of the world's most popular succulents. Native to southern regions of Africa, Crassula ovata is well adapted to the dry warm air of modern homes. It grows slowly but lives for so long that plants get passed from generation to generation. It is toxic to dogs, cats, and horses, and even mildly toxic to humans.

The great bougainvillea is best known for its bright flowers. It has spread around the world as a garden plant. This plant thrives in warm environments. The great bougainvillea is a woody, climbing plant that winds its way around other plants as it grows. It also has thorns that aid in its climbing habit.

Red frangipani (Plumeria rubra) is a deciduous shrub or small tree native to Central and South America. It is widely cultivated as an ornamental plant in tropical and subtropical climates. All parts of the plant are toxic when ingested due to their high alkaloid content.

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.

Common sowthistle is a common weed originated in Europe and West Asia. Alongside many sister species that hard to distinguish, it is considered to be an invasive plant in many parts of the world. Its leaves with some bitter taste are editable either green as a part of a salad or cooked in various ways.

The red azalea is a hardy shrub with recognizable, bright red flowers. They bloom in springtime, and prefer shady environments; in the wild they are often found growing under trees. Red azaleas make popular garden plants.