Ok, yeah lots of ppl in store are inexpensived.
Plants need something like 17 different nutrients.
Have you read the 4-part sticky http://www.tropicalfishkeeping.com/a...um-part-34861/
that's located at the top of this section? Its pretty good and it helped me a lot to understand.
You will need to get some fertilizer both liquid and some root tablets for your swords to do best.
Seachems makes a line called Flourish Comprehensive in both liquid form and in root tablets. Its a pretty good well rounded fertilizer for low tech tanks.
Also they need the right kind of lighting. If you read the links on the basic approach to natural planted tank. It will explain more on that. If look on the bulb itself it will have writting on it. Can you look at that and let us know what it says? Then we can tell ya if it will work for plants or not.