Of course it all depends on the situation and your relationship with your grow mate. You could express your concerns to him if he's a friend and make it very clear how important it is that he keeps his mouth shut. If necessary point out that he's the only guy besides you that knows of the spot and if anyone rats or rips he'll be the first guy you'll visit afterwards. See how he react and if it feels right then I'd use the spot.
Top up with some cheap seeds (seedstockers is running a 50% campain right now for example) and get the most out of it. Visit the garden rarely, only at night, slack a bit on the watering and maybe harvest a bit early and trim somewhere else than in the garden.
Top up with some cheap seeds (seedstockers is running a 50% campain right now for example) and get the most out of it. Visit the garden rarely, only at night, slack a bit on the watering and maybe harvest a bit early and trim somewhere else than in the garden.