If you had a bunch of marijuana wallpapers and favorites to sites about weed and bunch of mj related shit on your pc, and they found a plant in woods near your house, would they investigate that? When they find a plant, do they investigate around the property and try to find who grew it?
Depends on the country or state you live in. I've heard of cops using issues of 'high times' as probable cause, as well as other iffy things like smell or even a person's actions. I wouldn't worry about it though, if they catch you with one plant they're not going to raid your house and invade your pc (probably).