and did a search on herbs, but not much came up.
This is the issue.
The content has to come first. Then we can make new forums and categories.
When I first came to permies, I thought it was a lovely place, but it sure needed more yarn and cooking. I started making tutorials, asking questions, answering questions, and encouraging others to write about yarn (and cooking). About 20 min a day while having my morning coffee. It built momentum and others started joining in the conversation.
Even before I became a volunteer here, there was enough content to start making new forums. Then enough to make whole new categories like kitchen and fiber arts.