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What will grow in my polyunnel over winter

Sorry i cant help you Steve i only have ever done it once and found that it takes to long. Some on here do.
I prefer to rest the soil and flush it through then turn the topsoil to the bottom

Steve just by chance I planted some lettuces that were late in my greenhouse bed last Oct. I managed to have lettuce at Christmas and will definitely do the same this year. I am much further south than you but would still like to experiment.

Hopefully this year I will have the door sorted on this greenhouse which will keep it warmer.

Anythings worth a try if it dosent work then put it down to experience.

Last year was my first with a GH and I grew lettuce, which gave me a later crop but it all succumbed to botytris in the end. Later I learned I needed a mould resistant variety specifically for overwintering indoors.

I also grew carrots in deep containers, giving me a few baby carrots in May begin the year with before they bolted. I made the mistake of growing Autumn King for that when I should have chosen an early nantes variety and harvested earlier. Just wanted to see how big they'd get.

Might have a go at dwarf peas in deep pots this year.

I'd have a look at stump-rooted carrots like ROndo or preferably Atlas, radishes (some of the german ones are meant for winter production) maybe some leafy brassicas, though whitefly might be an issue, and I'
m planning on trying a very late crop of Speedie in mine (as well as another attept at winter new potatoes at some point)...

chrisc

I'll be putting early psb in for a nice early crop, along with a bit of smooth kale, overwintering broadies and Endives. Plenty of beetroots too for harvesting over the winter. Bernard Salt has plenty of ideas.