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This is interesting. I sowed S.canadensis from my own seeds in summer 2015 and they are germinating now.
I am never surprised when expected germination does not take place and especially with some genera such as Iris. Even the common and easy ones can be recalcitrant sometimes. Herbaceous plants though, such as your Aquilegia Hannelore, are perhaps more predictable but if I've learned anything, it is never to throw out pots of seed too early. Last year a single seedling germinated for me of a rare androsace, 3 and a half years after the few seeds were sown. It is now a single rosette about 1cm across.
I am interested to see Potentilla porphyrantha which I've seen described as "a poor man's P. nitida" not because it is less good but because it flowers well and is also a pink with silvery leaves.