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The bilberry (Vaccinium myrtillus) is a small, dark blue berry native to wooded areas of Europe and Northern Asia. The plant belongs to the heather family (Ericaceae) and is known for its characteristic flavor and wide range of uses in food.
Bilberries have long been valued in culinary traditions and are used in products such as jams, juices, desserts, and baked goods. Their deep color and natural composition make them a familiar ingredient in both traditional and modern cuisines.
The berries naturally contain various plant compounds, including flavonoids and anthocyanins, as well as fiber and other nutritional components. This composition is often mentioned in botanical and nutritional descriptions of the plant.

Chasteberry (Vitex agnus castus L.), also known as chaste tree berries, is a plant native to the Mediterranean region. The name "chasteberry" refers to its historical use by monks, who used the herb for its supposed effects on physical desire.
Today, chasteberry is widely used in herbal products and supplements. The plant's fruits contain various plant compounds, including flavonoids and iridoids, which give the herb its unique properties. Chasteberry is popular in traditional herbalism and is valued for its long history of use.

The mullein (Verbascum thapsus) is a member of the marram family (Scrophulariaceae) and mainly thrives in dune and chalk areas, where it is quite common. This plant is rare to find elsewhere in the Netherlands.
The flowers of the mullein are yellow and have a diameter of 1.5–3 cm. They consist of five connate petals, five sepals and five stamens, three of which are covered with yellow or white hairs. The flowers grow in dense spikes and bloom from July to autumn. An adult plant can reach a height of more than two meters.

The pansy (Viola tricolor), also known as the wild violet, is an ornamental plant that has been part of European botanical knowledge for centuries. The tricolor violet belongs to the pansy family (Violaceae) and is native to Europe, from Lapland to the Mediterranean, and even to Siberia.
This plant, which is annual but can sometimes be perennial, grows to a height of 30 cm and has roots that can reach depths of up to 45 cm. Its flowering period extends from May to October. The flowers are at least 1 cm wide, but usually larger, with an average diameter of 1.5 cm. The plant was first described by the renowned botanist Rembert Dodoens in 1554.