Yellow Brandywine Tomato cultivation
 

Last year I was given some Brandywine plants which were hugely successful in my greenhouse.
I fermented and saved some seed and would like some help in ensuring I grow them successfully from seed.
I have a unheated green house and poly-tunnel, and would like to know how and when to plant the seeds, and will be grateful for any other tips.
I live in North Derbyshire where the last frost date is about the 15th May.
Thanks
MD