Canadian waterweed (Elodea canadensis) has been introduced into Europe, Asia, Australia, and Africa, where it is considered an alien invasive plant. It is widely propagated and sold in the aquarium industry for its oxygenating properties, but in the wild, it outcompetes native plants; clogs up rivers, streams, and drainage channels; and obstructs boats.

As its common name suggests, meadowsweet is a sweet-smelling herb that often grows in meadows. It is a perennial in the rose family and is native to Europe, the British Isles, and western Asia, and has also been naturalized in parts of North America. Filipendula ulmaria has been used to create potpourris and to add flavor to beers, wines, and stews.

While originally used as an ornamental plant around the world, the creeping buttercup is now considered invasive in many places. Distribution usually occurs through the transportation of hay, making control difficult. The creeping buttercup is considered poisonous and can cause skin blistering.

The bigleaf hydrangea is a deciduous shrub native to Japan, and is known for its lush, oval, colorful inflorescence. The two types of Hydrangea macrophylla are mopheads - with large, ball-shaped, sterile flower clusters, and lace capes - with small round fertile flowers in the center, and sterile flowers on the outer side of each inflorescence. Depending on soil pH, blooms can change color from pink to blue.

Wild angelica (Angelica sylvestris) is a large annual or short-lived perennial flowering plant native to Europe and central Asia. It is also present and invasive in Canada, and cultivated as a garden plant elsewhere. Known for its large flowerheads containing tiny individual flowers, wild angelica has many traditional uses.

Herb robert (Geranium robertianum) is a plant species that can be found growing naturally worldwide, including in Europe, Asia, North America, and North Africa. The common name references Robert of Molesme, a Christian saint and herbalist from the 11th century. The herb robert gets one of its nicknames, "Stinking Bob," from the scent that the leaves emit when crushed; it's said to be similar to the smell of burning rubber!

European ash (Fraxinus excelsior) is a large deciduous tree featured in Norse mythology and Scottish folklore. European ash is native to mainland Europe. This species is susceptible to the disease Ash dieback which is caused by the fungus Hymenoscyphus fraxineus. European ash often grows in basic soils on calcareous substrates.

Elder is a malodorous shrub whose berries nevertheless act as an important food source for birds. To humans, except for its flowers and ripen fruits, other parts are poisonous. Ripen fruits can be cooked and made into jams, jellies and chutneys, while flowers could be made into syrups, but it is recommended to be guided by a professional before picking.

European beech (Fagus sylvatica) is a large deciduous tree often used for ornamental purposes. European beech tends to out-compete other tree species, due to its dense canopy and tolerance to shade. Its wood is highly valued and has a very diverse use, including making furniture, musical instruments, for construction, as firewood, charcoal, and plywood.

Common hawthorn (Crataegus monogyna) is a flowering tree that is actually part of the rose family. It is not unusual in garden settings and arranged as hedges. Examples of famous common hawthorn trees include the apocryphal oldest tree in France, and a well-known hawthorn in England that stood out for flowering three times a year.

The garden dahlia is a common spring flower that comes in a wide range of colors. The flowers themselves are unscented and attract pollinators, like bees, using only their bright coloration. Dahlia pinnata plants were grown by ancient Aztecs, and it is now the official flower of Mexico. It is genetically related to garden plants like sunflowers and zinnias.

English ivy is the most common climber of European forests. It is a perennial woody vine with evergreen, dark, shiny lobed leaves. It utilizes aerial rootlets to attach to the tree bark with exceptional strength, helping the english ivy creep more than 15 m up a tree. Hedera helix also grows as a forest groundcover and is invasive outside its native range.

Black alder (Alnus glutinosa) is indigenous to almost all of continental Europe. It’s used commercially in papermaking, in the manufacture of fiberboard, and in energy production. The bark of black alder has been used for hundreds of years in dyeing and tanning. The leaves of this species are so sticky, some people put them on the floor of their homes to trap fleas.

An invasive aquatic species, water horsetail is hardy and can easily overwhelm other water plants. This winter-hardy plant grows in shallow water and part to full sun. Due to its high silica content, early peoples used this plant for scouring and sanding.

Sycamore (Acer pseudoplatanus) is a tree native to Europe and Asia. Sycamore is tolerant of wind and coastal exposure. This species is known as the sycamore maple in the United States. Sycamore wood is commercially used to make musical instruments, furniture, joinery, wood flooring and kitchen utensils.

Common hazel (Corylus avellana) is a deciduous shrub species that is cultivated for its edible nuts. Hazelnuts can refer to the nut from any Corylus species, but it most often refers to Corylus avellana. The nuts from common hazel are eaten straight or used in making confectionary. Common hazel is native to Europe and western Asia.

Sorbus aucuparia, also known as european mountain-ash, is a deciduous tree native to Europe. It grows a slim trunk with upward-curving branches as it matures. Its admirable upright and dense branching gives the plant an oval crown. The juicy and soft clustered fruits are an excellent source of food for birds, while its yellow to plum foliage adds to its overall aesthetic appeal.

Scotch heather (Calluna vulgaris) is an evergreen flowering shrub that produces hundreds of rose-pink to purplish-pink, bell-shaped flowers that bloom in late summer. Relatively low maintenance, it is perfect in rock gardens or used as a border or ground cover. It prefers acidic soil and will grow from 30 to 61 cm in full sun to partial shade.

The vibrant colors and graceful shape of hardy fuchsia makes it a perfect choice to grace your garden. The hardy fuchsia is less sensitive to cold than other types of fuchsias, which means that this plant can go from containers or window boxes to permanent plantings along borders or as shrubs.

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.