build a shed in the backyard and grow in there. Put up a sign that says "He-man wuman haterz club.. no women allowed" If she goes in after that, tell her you are very dissappointed in her and you set the whole thing up just to test her willpower. If she cant even respect your privacy, how can you trust each other? Then turn it around on her and start crying like a little girl. Then get angry, then make love in the kitchen. Make sure to use kitchen utensils and film it. Send the film to......

oh wait.. sorry. Nah I dunno what to tell you. If a girl every gave me an ultimatum like that, then she clearly isnt the girl of my dreams and I would pick the plant without blinking or hesitating, staring her in the eyes the whole time. The girl of my dreams would either be fine with any marijuana-related ventures I might undertake, or be right along side me with em.