Help - my plants are dying again

I ordered 10 young coleus canina plants and they all died within a week. I received replacements last week, potted them immediately and watered them via a saucer. Since then they have sat on my kitchen windowsill and half of them are now dead!!

Does anyone know what I have done wrong??

 

Not grown them myself, so can only guess.
Are you overwatering them, they should be kept just moist after an initial watering, after potting up. Dont let them stand in water in the saucer.

 

Thanks Pete,

I drained the water away once they became moist, Mum has the same problem. She thinks they may have been overwatered for the journey :(