Having a garden close to your home would mean you're eating the freshest produce all the time. Most fruits and vegetables are picked before they can ripen on the plant and are then allowed to ripen in a semi truck on their way to you.
Vertical gardens are also great for urban areas and it would be neat to see employers in cities allow their employees to plant roof top gardens. Imagine picking vine ripened tomatoes, cucumbers and basil right before you leave work and making a very fresh salad for dinner. This could alleviate the need to run to the grocery store every few days to buy fresh vegetables.