It is not allowed to bring plants, seeds, fruit and other plant products from travel in countries outside the EU without these being accompanied by a phytosanitary certificate. The rules also apply to small quantities of plants and plant products. The only exceptions to these rules are fruits of pineapple, coconut, banana, durian and date, which can be freely imported.
If you bring plants for planting, including certain types of seeds for sowing, from countries outside the EU, these must be accompanied by a phytosanitary certificate and notified for import. The product will then be import-checked by the Danish Agency for Agriculture. You should be aware that there are costs associated with import control.