Hi @oz_boz, this can sometimes be the case for seedlings. Try adding more heat or light to your set-up to help them along. I know @NinjaTeaDrinker has recently had success growing Paulownia, maybe they can let you know how their seedlings progressed?
For context all photos taken just now, all planted at the same time! As you can see one germinated near enough straight away and 2 others have only just come through! Planted 10th October no idea why they are so different but moved them from the south windowsill to under light, but both areas are heat mats
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