Chelle, I checked the logs and found the problem. Instead of a single quote, you were entering a backtick around the word Limelight. The backtick looks like a quote mark but it is not. It's found under the tilde usually below the Esc key on your keyboard. The backtick doesn't have many uses and I'd recommend you disregard its presence.
The single quote you want is on the same key that contains the double quote.
This is the query you ran:
http://garden.org/plants/searc...
You can see the backtick quotes slanting from the top right to the bottom left.
Remove those quotes altogether and your query will look like this:
http://garden.org/plants/searc...
and there's the plant.
