All you need is a small amount of vertical space around a balcony or an open window which can hang or store a vertical array of drink bottles that can grow all your herbs and lettuce easily. Recycle as many of your plastic drink containers.
Mother's day window - lovely idea - simple to implement and gives a personal feel. Run a competition for your customers to feature photos of their Mothers. my lovely Auntie Janet lives on Waiheke Island too : )