'dense-flowering' originates from the combination of 'dense,' meaning 'closely compacted,' and 'flowering,' meaning 'producing flowers.'

'dense' and 'flowering' have been used in English since the Middle Ages, with 'dense' coming from Latin 'densus' and 'flowering' from Old English 'blōwan.'

Initially, it meant 'having a lot of flowers,' and this meaning has largely remained the same in modern usage.