Companion Planting With Borage
Borage is prized by organic gardeners for its properties as a companion plant. It attracts pollinating bees and wasps, deters tomato hornworm and cabbage worms, strengthens plant resistance to many common pests and disease and adds trace minerals to the soil .
It has a symbiosis, is a good companion of Tomato and related plants such as eggplant and peppers, Squash, pumpkin and other curcubits, and particularly Strawberries. 
When inter-planting borage with vegetables and herbs play close attention to your plant spacing, borage is a somewhat sprawling plant and is best kept on borders, as opposed to intermingled, so as to avoid over-crowding. You should give borage a wide birth of 2 1/2 to 3 feet.
To plant by direct seeding, cover the seed with a thin layer of soil and keep them well watered. A sunny location with fertile well drained soil is best , but they are tolerant of basically any soil type.
To start seedlings in pots, the best time to plant is about 3 weeks before the last spring frost date. I generally start a few at a time for transplant outdoors at staggered intervals. The seedlings should be about 2 - 2 1/2" tall by the time they are ready to go out into the world.
Hardening them off before placing them in the ground is advisable. Harden them off by placing them outdoors while still in their pots for steadily increasing periods for several days so they can acclimate to the outdoor environment.
Depending on the soil conditions, you might want to add small amounts of fertilizer. A fertilizer with a higher phosphorous content is best.
Other Herbs and Spices
Foot Notes - References
2."...borage won’t work in the same way as heavy doses of fertilizer and pesticides, it does positively impact strawberry yield." Strawberry Plants & Borage - StrawberryPlants.org