Posted: 22/04/2017 at 07:57
As for washing pots , in theory we should, few of us do. No one seems to have any ill effects to report. There was a thread about it a while back.
Ive only grown leeks from seed myself - I've not used bought in seedlings so I can't really comment, but the process is the same.
You might like to look out for a copy of Alan Titchmarsh's book, How To Be A Gardener - it'll give you a lot of the basic information you seem unsure of.