You can back into it. If you have a specific plant in mind, search it in the database. If anyone has indicated they have it, those names will show up as a clickable list.
I'll use Thin Man Daylily as an example:
Here is the main entry.
Daylily (Hemerocallis 'Thin Man')
See where it says 16 members have this plant? Click on that and you will get this list.
http://garden.org/lists/plant/...
The list shows several people who have it for trade.
You can also use the database to search out plants you have and see who might have indicated they want it. Then click on their plant list to see if they have anything you want in trade.
