These are tomato plants (with nasturtium) from last summer, nothing illegal.
This Garden Rant post about marijuana made me chuckle.
As did this article from Australia about a cannabis hedge.
It also reminded me of two things:
1) I live in an apartment and have no access to soil. My garden is made up of plants in containers (pots). This prompted a family member to refer to me as a “pot gardener.”
2) Last summer I had three rather healthy and hearty tomato plants. These plants are at the back of the apartment, on a balcony. You could see them from the street, but just barely.
We noticed a police car across the street for a few days, and assumed that he was visiting someone (or had moved in). This was great news: The normally-very-fast drivers slowed way down when they saw his car.
It was about day three that I noticed that the police car was inhabited. The officer was sitting in his car…and his car was positioned precisely so that he was directly in view of our balcony. I figured this was random coincidence (it likely was).
Then the tomato plants started to bear little green fruit. And the officer disappeared.
I do realize that he was probably positioned where he was for some unrelated reason. But I did laugh a bit about my possibly-suspicious-looking plants.