Hi everyone, I have planted cos letuus seeds which I bought from the organic catalogue about 5 years ago, cress and greek cress (which I also bought from the organic catalogue 5 years ago). I planted these seeds into pots and placed them on the kitchen and lounge window sill. Planting took place a few weeks ago. Still no sign of anything! Do seeds have a life span? I have had similar experiences in the past and to be honest it is very disheartening! Any advice is greatly appreciated.