If anyone is likely to get really close to plant - inches - it's likely that they will recognise what it even if just by smell. You could try planting something taller in size in a few pots and encircling the plant with these. If you have some kind of tree or bush with long branches in the area, you can cut off a few of these and stick them in soil around the outside of pot but you'd need to change them regularly when they wither. This would probably only be ok if it's your garden and you just want shielding from overlooking neighbours. If the garden is someone else's - parents etc - the very fact that you have developed a sudden interest in gardening might rouse suspicions on its own and regardless of any similar looking plant that you place close-by, the plant may give itself away during flowering.