The plant produces a (great/large/huge) 'mass of' blossoms every spring. = The plant produces 'masses of' blossoms every spring.
The mayor is trying to encourage more commuters to use 'mass transit' in order to alleviate traffic in the city.
His policies are supported by 'the' (great/broad) 'mass of' the people. [=by most of the people]
(..) - With all that nitrous. - Yeah. Yo, Dom. We were just about to go looking for you, brother. Where were you? There were mass cops there. They came in from every direction. It was orchestrated. - This your beer? - Yeah, that's my beer. Yo, Einstein. Take it upstairs. (..)2001 The Fast and the Furious