You will need:
- A thriving houseplant
- A coin
- A sprinkling of dried patchouli
Any plant will do, but if you have (or can get) a basil plant, it works better.
Just sprinkle a little bit of the patchouli on the soil, then stick the edge of the coin into the soil in the same place so part of the coin is still sticking up out of the dirt.
If some new money materializes in your life, spend that coin right away and put a new one in its place.