glads don't bloom

Can anyone give me some advice about my glad bulbs? I have had them in the ground for 2-3 years now. I get tall leaves but no flowers. Each year I have let the leaves die back naturally. Should I fertilize them or maybe try to move them to an area that gets more sun? We do live in a wooded area so full sun is hard to come by. Maybe this is my problem?

Glads need at least 6 hours of direct sun to flower, so move them to a place where they will be happy.

Thanks, I will try to find a new home for them this year and see what happens.