Posted: 19/04/2017 at 13:24
Not an expert here but this is how I see it
1 and 2. I'd keep them in the pots, or put into something a bit bigger, feed them and plant them out as they die down
3. I never deadhead anything but if you want to create a drift of wild daffs you'll need to let them seed. This only applies to the wild species. Cultivated daffs don't seed true
4. feeding time for bulbs is when they're in leaf. Then they build up for the next flowering. I'd only feed bulbs in pots or big fancy things (if I had any).
Daffs don't flower for long in deep shade but they don't mind some. I had so go blind as over-grown hazel coppice made it very dark. 18months after re-coppicing they flowered again