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They need a little sunshine to thrive, even if it's only early in the day. Also, I'm not sure if the flowers will open well without sun.
It might also be to do with last year's dry spell as they were finishing - although tulips like it dry in summer, they do need water when developing.
I had some foil-packed T&M hollyhock seeds that were 15 tears old and had been in the garage. Result - almost 100% germination.
Hi folks, I'm here, too. Will have a look around later.