Although some exotic tree species, new to the country at the time, had already been introduced at the turn of the 18th and 19th century in the Hungarian landscape gardens, using foreign tree species in the space composition became widely popular only from the second half of the 19th century. This research focused on determining the date of appearance and compositional role of exotic trees in Hungarian landscape gardens. We can still find aged exotic woody taxa which determine the historical spatial structure in numerous landscape gardens nowadays. The nationwide distribution of these species, and their location within the gardens, can be an important addition to the questions of the revitalization of historical gardens, the more so because they may be indicative of the climate adaptability and, therefore, resilience of built heritage environments. An experimental approach to the introduction and use of new exotic tree species in historic gardens where this approach can be proven to have existed is also discussed as an opportunity to use these gardens in search of new foreign taxa to adapt to climate change.

The study explores the online communication regarding three Budapest public parks opened in 2022, investigating what type of information is available about them to a wide audience and how vital ecological processes and living park elements are represented. Applying the methodof content analysis, the selected texts from primary (online platforms related to client, designer, or contractor) and secondary (interviews with designers, professionalpraises) sources were coded. The ten main code groups give an overview of the major fields and components of green space development projects. Each field appears in a different degree of importance, but the proportion of Design aspectscodes is similar for the three projects. Sustainability is mentioned in all three, suggesting that it is a key factor in the positive public perception of the project. However, the depth with which this is discussed varies, being merely an empty token in certain contexts. In the case of one project, there was regular communication about the project implementation on behalf of the creators. This is the same project that gives the most detailed information about living park elements and the ecological processes taking place between them. It is concluded that the conscious and responsible online communication about public green space projects has the potential to raise awareness by increasing the knowledge about and visibility of the essential ecosystem services provided by parks and green infrastructure in general, thereby contributing to their long-term protection.