If you live in the city and you’re trying to grow your own __ herbs/vegetables/flowers, you may be limited by floor/ground space. Planting on your walls is an option and vertical gardens can provide not just food (albeit limited), but cleaner air and cooler temperatures.
One Spanish company has created a system of modular planters that come with a maintenance-light watering system. You only need to water about every 15 days and that water goes into a hydrophilic system of 4 channels that distribute water.
In this video, we get a look at the Wallnatura system while visiting the Barcelona design fair Casa Decor.