The event marks the upcoming World Bee Day and 30 years of Slovenia's independence. The event was also attended by the daughter of the founder of the arboretum and Slovenian botanist Baroness Jelena de Belder-Kovačič, Diana.

The Kalmthout Arboretum is a precious tie between Slovenia and Belgium, founded by Jelena de Belder. Her mark on the botanic is great and so a part of Slovenia lives through her in this beautiful arboretum.

Its importance for both countries is seen from the numerous collaborations of the arboretum with Slovenian ones (e.g. Arboretum Volčji potok), Ljubljana Botanical Garden and Tivoli Park and activities already carried out by the Slovenian Embassy in Brussels (e.g. linden tree planting on the 20th anniversary of independence and plant of the famous Maribor vine).