Green’s Dictionary of Slang

1. (UK Und.) one who hides stolen property.

1859

Matsell Vocabulum.

2. (Aus.) one who steals and then hides cattle.

1890		‘Rolf Boldrewood’ Colonial Reformer III 54: What’s a little money [...] if your husband takes to idle ways and worse and your children grow up duffers and planters, and perhaps end in sticking up people.
1955		N. Pulliam I Travelled a Lonely Land (1957) 237/1: plant – to hide sheep or cattle which have been stolen. planter – one who does so.

3. (US teen) an undertaker.

1960

Eve. Standard (Uniontown, PA) 17 Mar. 35/1: Beatnik English by a Beatnik [...] Planter — undertaker.