Usually leave it, and try and forget about it.
But yeah, you could leave a simple note stating they might want find somewhere else more isolated.
Reminds of a time, had about 10 plants at home that had to go in the bush real soon before they got too big to move. Anyway, I half-arsed picked a spot in a big patch of lantana, cleared a patch 'n planted them out on a Saturday morning, all went well. I rock up on Sunday morning to give them another watering because I couldn't get back there until the following weekend. Only to lob there and see the patch cleared out and a $10 bill left behind, lol. I wasn't too upset in losing them, as I planted out heaps and done alright that season.
But yeah, I guess that's what you get doing things half-arsed.