botanical garden
US /bəˈtæn.ɪ.kəl ˈɡɑːr.dən/
UK /bəˈtæn.ɪ.kəl ˈɡɑːr.dən/

1.
giardino botanico
a garden dedicated to the collection, cultivation, and display of a wide range of plants, often for scientific and educational purposes, and typically open to the public.
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We spent the afternoon exploring the beautiful botanical garden.
Abbiamo trascorso il pomeriggio esplorando il bellissimo giardino botanico.
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The city's botanical garden hosts various educational programs.
Il giardino botanico della città ospita vari programmi educativi.