Echinacea Seedlings Not Growing

in Plants
Hi all,
I sowed some Echinacea Purpurea seeds in septemeber that I plan to overwinter in coldframe, they germinated pretty fast but they just don't seem to be growing... Only one had a true leaf, not even a pair of true leaves just the one! The rest are just the cotyledons.
Is it just too cold for them now? Should I have waited till spring to sow them? Everything else I've sown in September is flourishing but the echinacea just seem to be very slow.
Thanks in advance.
I sowed some Echinacea Purpurea seeds in septemeber that I plan to overwinter in coldframe, they germinated pretty fast but they just don't seem to be growing... Only one had a true leaf, not even a pair of true leaves just the one! The rest are just the cotyledons.
Is it just too cold for them now? Should I have waited till spring to sow them? Everything else I've sown in September is flourishing but the echinacea just seem to be very slow.
Thanks in advance.
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If you get your coldframe done, remember to keep a little bit of ventilation going too, and keep an eye on them in spring once things warm up a bit. The fluctuating temps can cause a wee bit of hit and miss growth, so it's a case of keeping them on an even keel until they're sturdy enough to go out through the day and in at night, and then planted out.
I live in west central Scotland - not where that photo is...