Okay, I think I have a solution. I've enabled a different kind of matching and now you can use a star as a wildcard.
So if you wrap your phrase in quotes it will only match that exact phrase.
If you want it to match an incomplete word you can add a star to the end of the word and it'll match anything after that. You can also put the star at the beginning of a word, too.
http://garden.org/plants/searc...
Is this a good solution or should I go back to the way it was this morning?