With Christmas now over and just New Year's eve to go, it is already time to think about sowing your onion seeds. I plant mine in seed trays using some very good quality seed compost. I lay a light covering of this over my onion seeds and then lightly water them. I then place the seed trays on my window sills and give them time to germinate, which normally takes between 14 - 21 days. The trick is to make sure the temperature stays at around 19 -21C and not to let this get too high as it will slow the germination down.