An added bonus to growing many edibles and aromatic herbs is that they attract beneficial insects and pollinators. It is important, however, to watch that you combine plants that have similar watering needs, sun and food requirements. Herbs that are invasive such as mint can be grown in containers either above ground or sunk into the ground.
Where should we look for room? Space can often be found around early and late blooming perennials. The early bloomers will be cut back and offer room for an expanding tomato or pepper plant. The late bloomers such as rudbeckias are slower to shoot out and won't mind sharing space with lettuce, green onions or radishes or garlic.