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Salvia nemorosa should be OK, they are hardy down to -20C. If they die I can just send you some more seed 
I've sown quite a few flower seeds already and will be sowing even more at the start of February. They don't go under lights, just on a sunny windowsill or in the greenhouse if it's warm enough.
In February I sow cold hardy things like brassicas, lettuce, spinach, peas, spring onions and shallots. They stay in the greenhouse, maybe with an extra covering if there's a sharp frost forecast. Also some early carrots in pots.
Beans, not until April in the greenhouse at the earliest. Can't imagine how big a January sown squash will be by May!
There is a Youtuber who grows early climbing beans, courgettes and cucumbers quite successfully, but it's a lot of extra work (heated conservatory, bubble wrap, fleece etc.).
I've sown quite a few flower seeds already and will be sowing even more at the start of February. They don't go under lights, just on a sunny windowsill or in the greenhouse if it's warm enough.In February I sow cold hardy things like brassicas, lettuce, spinach, peas, spring onions and shallots. They stay in the greenhouse, maybe with an extra covering if there's a sharp frost forecast. Also some early carrots in pots.
Beans, not until April in the greenhouse at the earliest. Can't imagine how big a January sown squash will be by May!
There is a Youtuber who grows early climbing beans, courgettes and cucumbers quite successfully, but it's a lot of extra work (heated conservatory, bubble wrap, fleece etc.).
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