It really comes down to your climate and conditions as to what you do. They don't like cold, wet, or freezing conditions long term. I leave them until late spring, because they don't always survive winter here, and the top growth helps to protect them a bit. I also take cuttings in summer as back up, because they don't seed readily either. If they're against the house walls, or tucked in among other planting, that can help though.
If in doubt, experiment a bit with the plants you have, and see what works best for you.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
We leave ours overwinter, the tits and goldfinches love the seeds and it’s entertaining to watch. Ours never grow into big plants they are only ever single stems. Our soil is quite rich and where they are the soil can get quite waterlogged in winter so I think they must only last a year or two. Interestingly despite that they self seed and we always have a dozen or so popping up (single stems only)
If you have a garden and a library, you have everything you need.”—Marcus Tullius Cicero East facing, top of a hill clay-loam, cultivated for centuries (7 years by me). Birmingham
I have loads of seedlings all over the borders at the moment. Is now a suitable time to transplant the larger (or smaller) of the seedlings to a more suitable place?
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I leave them until late spring, because they don't always survive winter here, and the top growth helps to protect them a bit. I also take cuttings in summer as back up, because they don't seed readily either. If they're against the house walls, or tucked in among other planting, that can help though.
If in doubt, experiment a bit with the plants you have, and see what works best for you.
I live in west central Scotland - not where that photo is...
East facing, top of a hill clay-loam, cultivated for centuries (7 years by me). Birmingham