Start with the Bercy address
The Maison du jardinage et du compostage is at 41 rue Paul-Belmondo in parc de Bercy, Paris’s 12th arrondissement. The municipal description presents it as a resource for urban gardening and composting, open to beginners as well as more experienced gardeners.
Choose a question or interest before visiting: caring for a plant, understanding composting or finding gardening reading. That gives the visit a purpose without assuming that a specific workshop will happen whenever you arrive.
Check the library and activity programme
The city lists a specialist library open on Wednesdays, Saturdays and Sundays from 13:30, excluding public holidays. Its page states that activities are free and directs visitors to the current monthly nature programme for the calendar.
Free does not necessarily mean unreserved. Read the individual activity notice for its date, intended audience and booking requirements. Do not treat a library opening afternoon as confirmation that a supervised practical session is available at the same time.
Plan around the actual session
If a session interests you, note the meeting point, registration confirmation and any equipment instructions it provides. For a casual visit, check the house’s current opening information and the park’s access notice before travelling.
If you want to add a walk in parc de Bercy, leave time before or after the scheduled session. Keep the park visit and the workshop timetable as separate parts of the outing, so an unbooked activity is not the only reason for the trip.