Posted: 27/03/2016 at 17:29
Marc - believe me, the strength of light received through a window is totally different to light received by a plant outside. Even in a greenhouse plants don't get as much light as those outside.
Get some large clear plastic water/lemonade bottles. Cut the bases off and take the caps off (you can drink the water/lemonade if you wish )
Put the plants outside and put the bottles over them like cloches - that'll protect them from the wind and slugs and they'll grow strong and sturdy.
But I'm not going to sow mine until the end of April.