window box
US /ˈwɪn.doʊ ˌbɑːks/
UK /ˈwɪn.doʊ ˌbɑːks/

1.
fioriera, cassetta da finestra
a long, narrow container for growing plants, typically placed on a windowsill or attached to the outside of a window
:
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She filled the window box with colorful petunias.
Ha riempito la fioriera con petunie colorate.
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The old building had charming window boxes overflowing with geraniums.
Il vecchio edificio aveva affascinanti fioriere traboccanti di gerani.