James Britten & Robert Holland in their Dictionary of English Plant-names (1886) record grass as a name for asparagus (Asparagus officinalis) in ‘Sussex, etc.’ and state that this is ‘a frequent popular corruption’.
127 years later this ‘popular corruption’ is still current. Asparagus on sale in Berwick Street Market, Soho, London, on 28 May 2013 was labelled ‘GRASS’.

Asparagus, labelled as ‘best grass’, was also on sale from stall outside Goodge Street tube station, Tottenham Court Road, London, 12 February 2015.

Also on sale from a stall in Earls Court Road, London Borough of Kensington and Chelsea, on 16 June 2023:  ‘English Grass, £2 a bunch’.

Image: asparagus purchased at Balham Market, London Borough of Wandsworth; April 2014.

Updated 16 June 2023.