Excel death??

[Buckfins]

Does Excel kill certain kinds of plants? I have a nicely planted tank and have noticed that a few plants that I have added have died off. I followed the instructions on the bottle and from my local fish dealer, but some plants that I added just didn't make it while others have really taken a shine to it. Thoughts or ideas?

 

[jetajockey]

Certain plants don't handle it well, vals and anacharis are two that come to mind.