I've seen several posts in this thread telling you to "give her money for shoes and purses" if you get the money to grow. You cannot compare the two - last I checked, buying shoes and purses will not land you in jail or lose you everything you own.
If you wanted, say, a membership to a golf club, and your wife was against it - I could see you bitching, and maybe doing it anyway. But - again - you cannot compare the two. Growing is ILLEGAL - and if you get busted, it affects your wife, and her life, as well! She (just like any man, woman or child) has a right to feel safe and comfortable in her own home! Therefore - if she does not want you to do this, then leave it alone! If you don't think that's fair - then maybe you shouldn't be married.
The only alternative, is to try a grow somewhere else, and if you do well and don't get caught, then maybe your wife will change her mind down the road.