From David The Good YouTube channel: 11 Ways to Make Money from Your Gardening Addiction (Goodstream #97) https://buff.ly/2AXjuhP:
1. Care for Landscaping
2. Garden Installation
3. Grow medicinal herbs
4. Start a seed company
5. Start a U-pick
6. Make homemade hot sauce/jam
7. Plant a food forest and sell the produce, plus give tours.
8. Plant traditional gardens/start a small farm and sell the produce
9. Sell flowers to arrangers
10. Start a home-based plant nursery in your niche
11. Finally - you can write about gardening or start a YouTube channel.