More plants to sow side by side for better growing conditions for both:

Leeks with carrots, lettuce, radishes, strawberries; lettuce with carrots, radishes, strawberries; onions with beets; peas with beans, carrots, corn, cucumbers, radishes, turnips; potatoes with beans, cabbages, corn; pumpkins with corn; radishes with chervil, cucumbers, lettuce, peas; spinach with strawberries; tomatoes with asparagus, celery, marigolds, parsley.