There are reports about companion plants that can be grown next to various flowers, including zinnias, to promote healthy growth. Some outlets have listed specific numbers of companion plants, such as 9 or 11, that can be grown next to zinnias, while others discuss companion plants for different flowers like hostas, basil, and coleus. The information available suggests that certain plants can be beneficial to grow together, but the specific combinations and numbers of plants vary across reports.