Green’s Dictionary of Slang

1. (US black) money.

1945		R.L. Bellem ‘Ruby Ransom’ Hollywood Detective Dec. 🌐 From the reticule she dredged a roll of greasy lettuce, not the crisp new greenery you get from banks but the limber kind you find hoarded in an old sock.
1979		‘Iceberg Slim’ Airtight Willie and Me 100: He plucked off its top the fat stack of greenery. He riffed it before her eyes.
2008		C. Faust Money Shot [ebook] ‘Remember, you gotta show the greenery if you want to see the scenery’.

2. (UK black) marijuana.

1997

C. Newland Scholar 195: All I wanna do is buy some greenery an’ put my feet up for the rest o’ the day.