Just leave em alone. If anyone sees them and knows that they are:
1. Most likely will wait until it buds and will steal them, or think the leaves are smokable and will steal the plants before they bud.
2. will be your neighbore and will ask you if you know what it is, play dumb and say no... and if they tell you what it is, act shocked and go kill them...
3. a no-good-for-nothing-good-doer will call the cops... if the cops show up, they will 90% likely cut em down and take them with them after you play the dumb card and say they sprouted up this spring and you thought they were pretty and left them....

unless you live next to a cop, the likely hood of someone recognizing them is slim... you are more likely to run into number 1 above than any other.... you have to remember, this is a plant that has been erradicated in these lands, and not alot of people can tell what they are just from looking at it, the one who do know what it is from looking at it either smoke it or are OK with it in some way, or they are trained to know it.....

I was installing cable at an apartment complex and the main connection box was around the back of this long building that was made of about 4 or 5 units. I made my way around the building down to the unit I was installing the apartment for and walked up to the main box. While walking up to the box mounted to the exteriour wall of the building, I had to walk though some low (thigh high) vegitation... Kind of pushing it aside with my knee, and I realized that I was walking though a 12x12 sqare foot area of marijuana plants that were camo'd with other vegitation.... freaked me out that someone would plant about 100 or more plants just right here in the open where every apartment on the unit opened up to the back area and could see it. It was about in the center of two apartments on the lower floor that had open concrete decks and had BBQ stuff out on them and then above the decks were deck/balcolnes for the upper apartments...
This grow was right out in the open... I picked a leaf, put it in my tool bag, and finished my job...

Go put a few tomato plants around them....