The Conservatory and Botanical Garden of the City of Geneva (CJBG) obtained from the Board of Directors of the Botanic Gardens Conservation International, the privilege of hosting the 6th Global Botanic Gardens Congress, in connection with the commemoration of the 200th anniversary of the foundation of the Botanical Garden of Geneva, by Augustin Pyramus de Candolle, on the 19 November 1817. The event was held in Geneva from the 25th to 30th June, 2017, at the International Conference Center of Geneva (CICG) and the CJBG. Around 500 participants from more than 60 countries participated in the 10 plenary sessions, 200 lectures and 15 excursions. Having renounced the production of the proceedings of the Congress, we thought that it would be useful to publish the abstracts of conferences, symposiums, round-tables, workshops and posters that were presented at the congress electronically. Abstracts of the presentations or discussions in the plenary sessions are not included, but they were filmed, except for the discussion led by Paul Smith on Tuesday morning where technical dificulties were encountered. The links to the site hosting these videos are embedded in this electronic document. The links to the videos of opening and closing ceremonies of the congress are also included.