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The birch (Betula) is a tree that has held a special place in European cultures and traditions for centuries. Historically, the birch was sometimes seen as a symbolic or even sacred tree, partly due to its role in seasonal rituals and folk customs.
In early spring, just before the tree begins to bud, birch sap can be tapped. This time coincides with the period when the sap flow is most active. Young birch leaves are also traditionally collected during this phase. Both the sap and the leaves are part of ancient customs and have long been described in botanical and herbal sources.
Birch leaves naturally contain various plant compounds, including flavonoids, saponins, and tannins.

Bitterwood, known in Suriname as kwasibita, is the heartwood of Quassia amara, a plant species in the Quassia genus, belonging to the Simaroubaceae family. The plant is native to tropical South America.
Quassia amara is a small, evergreen shrub found in regions including the Guyanas, northern Brazil, and Venezuela. The plant grows primarily in the rainforest understory. Its striking bright red flowers, which are primarily pollinated by hummingbirds, are a striking feature. Because of these decorative flowers, the plant is also cultivated outside its natural habitat as an ornamental.

Lemongrass, also known as sereh (Cymbopogon citratus), belongs to the grass family (Poaceae). This plant is widely used in Asian cuisine, especially in dishes from Thailand, India, Vietnam and Indonesia. Lemongrass thrives in several regions, including India, Africa, Vietnam, Australia and America. In Indonesia it is known as sereh, and this name is also often used in the Netherlands.
The leaves of the lemongrass plant are the culinary stars. They have a refreshing, lemony taste and are not consumed raw. Pieces of lemongrass are often added to dishes during cooking or stewing, after which they are removed before serving.

The purple coneflower (Echinacea purpurea) is a perennial plant belonging to the Asteraceae family. The genus name Echinacea is derived from the Greek word echinos, meaning "hedgehog," and refers to the spiky flower cone that characterizes this plant.
Echinacea purpurea is native to North America and is now cultivated worldwide. The plant has striking purplish-pink flowers and is valued for its ornamental appearance and botanical properties. Since the early twentieth century, there has been considerable interest in this species in Europe, leading to extensive botanical and historical research.