I can recommend three brands that offer high-quality organic potting mix:
- Burpee Organic Potting Mix (USA)
- Espoma Organic Potting Mix (USA)
- Pro-Mix Organic Potting Mix (Canada)
These are all high-quality organic potting soil mixes that are mainly peat moss, coconut coir, and perlite. They also contain beneficial mycorrhizae and/or organic plant food. This general mix has worked the best for me in my container gardens.