welcome Stephen Barstow . Looking forward to reading your book.

I have two places about 150 miles apart the climate is so very different
I grow lots of greens,
In the east place that is wetter they are large and grow all year round.
at the west place they are small and do grow year round but are very smallish but more flavor full and I'm assuming more nutrient dense.
They both have natural and diverse winter flora and fauna that grows all winter.
It would be good to know what you can eat and not .

Thanks for the heads up, Jimmy!! Hope you enjoy the journey...

Learning your local wild edibles is certainly a skill worth learning, so buy some books and look out for foraging courses....and yes, it could well be that the smaller plants are more nutrient dense as are often wild plants...

Your title is brassicas...

Here, a sub-tropical climate, I know about 2 local wild brassicas, and they are called "plants for soup", not in use any more....
Relinchon y rajamago....

1 has white flowers, and the other one is with yellow flower.
I an still not ale to recognize them before they flower.
I can get some seeds from what birds leave me...
And try to find their latin name too!
That wiuld help!