You get there only per boat from Ascona or Ronco (most likely also from Locarno) - the costs for the trip incl. entrance fee amount to about 20 CHF.
The island is a nice place, crowded on weekends. It can be visited within one hour. If you are a freak, however, plan for a longer stay.
There are plants from all over the world, nicely group together.
The trip is worthwhile during all seasons with spring and summer probably being more interesting than fall (more plants blooming).
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