Ma Yuan couldn't replicate their quality with even three or four spiritual herbs, let alone match the thousands of herbs in each field.
He couldn't help but be awed by the scenery before him. It took great skill beyond his imagination to achieve such results. From the quality, down to how they were even able to grow a huge variety of spiritual herbs in a single field.
From his experience, spiritual herbs were similar to spirit beasts. They would always try to dominate one another in competition for territory, and the higher the quality of the spiritual plant, the higher the odds something like that would happen.
A top-quality spiritual herb would stifle the growth of other spiritual herbs around it, and those that do grow around it, are 'slaves' to that one herb. All they do is provide resources for it to grow stronger, but all around, Ma Yuan saw countless herbs growing together, of similar quality.