So I've had this idea for more than a year now! I'm thinking of putting a smaller type of marigold, a micro tomato, and some type of basil, on the back deck. The area gets full sun, and the container they would live in is 21 inches in length, 11 inches in width, and 5-7 inches in depth. I've grown purple basil with mint and petunias in it succesfully before. Will this new plan work? What types of marigold and basil should I look for? Thanks!