From A Wiki of Ice and Fire
|Coat of arms|| A silver helm crested with a sprig of broom, on a checkered black and green field|
(Chequy sable and vert, a helm argent, crested with a sprig of broom proper)
According to semi-canon sources, they blazon their arms with a silver helm crested with a sprig of broom on black and green checks.
House Broom at the end of the third century
The known Brooms during the timespan described in A Song of Ice and Fire are: