| Woolly | Sparkling | Rose | Green | Purple | Black | Brown | Magic |
Organic | Unusual cotton | Sparkling cotton | Thorny Rose | X | X | Unusual fish bait (magic trout) | X | Magic fiber |
Mineral | X | X | X | Unusual Berry (hard flat fish) | Hard Corn (spiked clam) | X | X | Unusual weed |
Mixed | X | X | X | X | Unusual corn (waddling) | Black wood branch | Dark wood branch | Chrome green fruit (chrome green catfish) |
X= seed/fertilizer combinations that result in nothing (so... don't do it)
(Parentheses)= obtained using the crop as fish bait (doesn't matter which fishing spot you choose), notice that the crops used as bait don't seem to serve for crafting
General armor
Magic armor
Light armor
Heavy armor
this is what you'll usually get, bar some exceptions (for example, the heavy armor combination can also result in a gun attachment or shield)
I suppose finding out the potential results is just a matter of sitting down and crafting a lot, on the plus side if you have the materials after successfully crafting something it offers the option of repeating with the same combination (though unless you've grinded/cheated a lot of materials I'd suggest against this, and just savescumming until you roll a legendary)