Last weekend I planted several herbs and salad crops, of which the first to appear just three days later was some red leaved basil in two separate pots. They were coming on really well, most looked quite strong - and then rather suddenly I noticed over half of them had simply fallen over. On closer inspection their lower stem had shrivelled up. At present I have just two remaining and one of those already looks like it's on the way out.
I couldn't see anything obvious initially, but I recall watering from the top the day before they started to die. Could this be it? Should I have placed a tray underneath the pot and placed the water in there instead? If that seems unlikely, are there any other thoughts? I'm going to be planting some more soon and hoping to have a bit more luck next time!