Link - Companion Planting Guide

I never plant anything in rows.  My garden beds usually look like a riotous mix of plants with herbs and flowers tucked into every available spot between vegetables.  I'm a big fan of using companion planting to enhance the growth of plants, repel pest bugs, and attract beneficial bugs to my gardens.  A little knowledge can go a long way towards keeping harsh chemicals far away from your vegetables and flowers. My favorite book on companion planting is Carrots Love Tomatoes by Louise Riotte.  But you can get started with this useful link on companion planting.   It's not as comprehensive as the book, but it is a very good start.

Link - GardenToad's Companion Plant Guide

Companion Plants: Sweet Pepper & Okra

Leave room in your sweet pepper beds for okra. Okra often grows taller than pepper plants, offering a bit of shade in our burning Texas sun and wind protection.
Michele advises us to generally not plant okra before May, due its resentment of coldish weather; however, if you leave space for it where you've planted sweet peppers, then you should be able to fit the okra in nicely.

Companion Plants: Borage

Photo by Jengod

Borage makes a good companion plant for tomatoes and all brassicas. They're also one of the few plants that have truly blue flowers. I have borage interplanted throughout my garden beds, mostly as companions to strawberries and tomatoes. Borage itself is also edible by the way.