A flower or flowering plant grown in a flower bed; a ornamental flower planted in garden beds.
From 'bed' (a plot of earth for planting) + 'flower.' This compound emerged in horticultural contexts during the 1700s as gardening became a popular leisure activity.
This word is basically obsolete now because we just say 'bedding plant' or 'flower bed flowers' instead, but it shows how people once made descriptive compound words for everything in their gardens!
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