The labeling convention used here is week and year... So 4405 means the 44th week in 05.
Great Plant Travis, I think you are now obligated to get an edwardsiana tattoo...
Also, are those hard water spots on the plants pictured any harm to the plants? I've noticed them starting to show up in my GH from excessive misting with the hose. Just misting though, I still water with RO.