I think you could plant them out whenever you like. If they've been indoors the flowers will probably die pretty quickly if you've got the drying wind that we've got here, but they should flower again next year. Give them a feed while the leaves are still green to help them build up their bulbs for next year.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Not something I've ever done, but I think you'd be ok doing as @JennyJ says. If you're concerned, you could do some planted out now, and leave some to die back first and then plant. You could then judge which worked best, in case you do it again in future. Feed either way though
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
I always start my new daffs in pots and plant them out in the spring, and sometimes I'm late doing that and they're already in flower. They're not forced but I do plant them a good bit deeper than they are in the pot. I've planted out forced indoor hyacinths in full bloom though, when the scent was a bit too strong indoors.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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If you're concerned, you could do some planted out now, and leave some to die back first and then plant. You could then judge which worked best, in case you do it again in future. Feed either way though
I live in west central Scotland - not where that photo is...