**3. The biology of the** *Rosa* **species**

The best characterized species of the *Rosa* genus are *Rosa canina* L. and *Rosa rugosa* Thunb. Whereas the fruits from *R. canina* have been mostly used in traditional medicine, the *R. rugosa* variety is better known for its larger and well-tasting rose hips. Both species are currently used in the production of food products [15, 24], and in some countries, including Denmark, they are grown on an industrial scale [25].
