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what can you suggest to grow over winter in an unheated greenhouse?

Would carrots in tubs for example cope with low temperatures?

Any ideas would be gratefully accepted!

OR am i wasting my time and energy (which i don't have lots of) the energy bit that is!

I grow mixed salad greens all through the winter and yes carrotts if you pick the right kind, yoiu can always pop  some fleece over them. Start them early though  in tubs and put in greenhouse when it starts to get cold.. I do spring onions and radishes too.

Some of the oriental veggies will grow fine in this situ.

XX Jeannine

Lettuce lovely & don't get bugs on - Winter Density & Winter Gem. Found spinach also did well last winter. Going to try some of the red spring onions this year as well, I think.

A couple of years ago I tried Nantes Frubund carrots which are supposed to be over-winterable and they appeared to bolt in the Spring - GYO Tentpegs.  Vigorous but largely inedible.

I found a packet of Eskimo Carrots "The most cold-tolerant carrot" in a clearance bin and I was going to try them next.  But they are really late planting rather than over winter.

But it is the low winter light levels as much as the cold that makes it difficult.  I think you might do best with quick croping stuff and stuff sowed early in the Spring.