Broom and room occur with the vowel [oo] /u/ of fool or [oo] /ʊ/ of book. The first is the more common. The pronunciation with the [oo] /ʊ/ of book is found in New England, eastern Virginia, and South Carolina and Georgia alongside the [oo] /u/ pronunciation. Farther west the [oo] /u/ pronunciation is more common, though the pronunciation with the vowel of book occurs everywhere with no marked regional or social pattern. Both pronunciations occur in British standard and folk speech. The pronunciation with [oo] /ʊ/ predominates in the eastern counties, [oo] /u/ everywhere else. London lies on the boundary between the two types, and it is thus not surprising that [oo] /ʊ/ is found in the United States in the coastal areas that had long and close contact with England.

Did you mean blooming?