Green’s Dictionary of Slang

1. (also cabbage-field, -garden, -patch) the vagina; one of a number of terms that equates the vagina with a vegetable.

1890–1904		Farmer & Henley Sl. and Its Analogues II 3/2: cabbage..6. (venery).—The female pudendum [ibid.] IV 337/2: monosyllable..(venery).—The female pudendum. English synonyms: cabbage-field, -garden, or -patch.
1916		H.N. Carey Sl. Venery I 37: cabbage - 1. The female pudendum.
1924		Maggie Jones [song title] Anybody Here Wants to Try My Cabbage.
1935		Lil Johnson ‘Anybody Here Want to Buy My Cabbage’ 🎵 Now, I’ve got good cabbage, smelling mighty sweet.
1938		Jellyroll Morton ‘Low Down Blues’ 🎵 I got a sweet woman; she lives right back of the jail. / She’s got a sign on her window, ‘Good Cabbage for sale’.
1966		Trimble 5000 Adult Sex Words and Phrases.
1982		Maledicta VI:1+2 (Summer/Winter) 131: Cabbage, cake, canoe, cock, poontang from putain.
2000		M. Manning Get Your Cock Out 72: You’d think that now her cabbage had been turned inside out by little Lourdes and her paps shrivelled up into lactating paper bags she’d lay off all this soft focus sex rubbish.

2. a woman.

1947		B. Rose 8 May [synd. col.] The little cabbage spoke up for her generation [W&F].
1963		in T.I. Rubin Sweet Daddy 25: I like cabbage.
1997		Roger’s Profanisaurus in Viz 87 Dec. n.p.: cabbage n. Girls; totty (qv). As in ‘I’m looking forward to going out this evening. I hope to get some cabbage’.