Green’s Dictionary of Slang

1. the hiding of stolen items, esp. horses, and then ‘discovering’ them as soon as a reward is offered.

1859

Matsell Vocabulum 68: planting Hiding, concealing.

2. (Aus./US) a funeral.

1900

Bulletin (Sydney) 28 Jul. 13/1: Would any Sydney funeral be de rigueur in the absence of the ubiquitous ‘Mr. E -- --’? When his own ‘planting’ comes along, Mr. E -- --’s ghost will simply holler if the dailies don’t give the corpse a ‘personal’ boost.