Autumn sown onions
I sowed overwiintering onions in September as advised, but when do I transplant them? All are doing well, healthy little seedlings, but they haven't got their third leaf yet. I'm worried about the approaching frosts, mid October is our average first frost.
They seem very little to survive cold temperatures, should I cover them? The trouble with seeds is that you get so many, I sowed a pack of white, (Shonomaki yellow?) and one of red (kamal?), I must have 3-400 seedlings!