window box

US /ˈwɪn.doʊ ˌbɑːks/
UK /ˈwɪn.doʊ ˌbɑːks/
"window box" picture
1.

bloembak, vensterbankbak

a long, narrow container for growing plants, typically placed on a windowsill or attached to the outside of a window

:
She filled the window box with colorful petunias.
Ze vulde de bloembak met kleurrijke petunia's.
The old building had charming window boxes overflowing with geraniums.
Het oude gebouw had charmante bloembakken die overliepen van geraniums.