@jmahay - tender plants would need more than basic cover, but we aren't talking about those. You could only mulch half hardy or tender plants if they were established plants, in the ground [not in small pots] and if you were in an area where they would readily survive with that treatment. In most parts of the UK, the plants the OP is growing are not tender in any way. If @rcb8385458 was much further north than me, or at serious altitude or exposure, they may need extra help for them when they're small, but if that was the case, they'd be better sown in spring. In that instance, if there's no heated greenhouse to overwinter, they'd need to be in the house. At the stage they're at, for most areas, basic protection should be fine.
There will always tend to be casualties sowing anything in autumn, because it's harder for small plants to thrive, unless you have perfect conditions and no winter weather.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
If you're anything like me and you do use the plastic greenhouses, every time there is a really windy night you'll lie there stressing about whether they're still in place 🤣. I've tried to minimise my use of them if only to get some sleep!
My climate is extremely cold (USDA zone 4 b, which can get as cold as -28.9/-31.7 C, but generally runs in the negative teens/20s C for most of the winter), but we get more snow pack and less wet than the UK. I've had the best success in overwintering small seedlings or young plants in raised beds, planted in autumn, heavily mulched with wood chips, covered with a fleece, then again with a tarp. I cover them after the first good frost. Many times I'll bury plants in their pots in raised beds, too. If they're more established, they generally don't need the covers, but again our winters aren't as wet as yours. Someday I hope to have a greenhouse!
New England, USA
Metacomet soil with hints of Woodbridge and Pillsbury
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In most parts of the UK, the plants the OP is growing are not tender in any way. If @rcb8385458 was much further north than me, or at serious altitude or exposure, they may need extra help for them when they're small, but if that was the case, they'd be better sown in spring. In that instance, if there's no heated greenhouse to overwinter, they'd need to be in the house. At the stage they're at, for most areas, basic protection should be fine.
There will always tend to be casualties sowing anything in autumn, because it's harder for small plants to thrive, unless you have perfect conditions and no winter weather.
I live in west central Scotland - not where that photo is...