Bulbs often do eventually go blind, but one reason might be that you planted them too deep, I think.
The
Van Meuwen website suggests this too: "Daffodils may fail to bloom, or come up ‘blind’ for a number of reasons. If they were successful in previous years, the most likely cause for not flowering is that the bulbs have multiplied and become too crowded. Try digging them up and dividing.
If they’ve never flowered, it’s likely they were planted too late, the bulbs were too small, or they’re not getting enough sunshine."
You could also try feeding them with a high potash fertiliser to see if that makes a difference next year.
