How often to feed 'blind' daffodils?

Hi. My potted daffodils grew blind this year, sadly (apart from one?!). Last year I left all the foliage to completely die down (and I didn't tie the foliage in knots!). However, I didn't feed the bulbs and I think this may account for the lack of flowers this year. I fed them a couple of days ago with tomato food but I'm wondering if I have to keep doing this, or once is enough? Many thanks in advance.

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Are they very congested? If so, splitting them up might get them back into flower (next year).
If you live in Derbyshire, as I do.
can you plant them out in the garden? They’ll probably be happier and will flower next year.