Have you buried the bulbs too deeply? The neck needs to be above ground. They also need full sun and a dry dormancy so do not water once the leaves have died back until the flower buds start to appear. Basically think Mediterranean so you shouldn't be feeding at all.

Yep, best in very dry, light soil - the best ones I've ever seen grew at the foot of a southfacing wall, right up against the wall - they'd spread themselves all along, right in the rain shadow where they got hardly any moisture, and the soil was really light and sandy. Never fed, never watered by the owner either. He gave me some - they're crammed into a pot on the balcony, I throw a bit of water at them occasionally when its hot, otherwise, they have to rely on a bit of rain getting in there, and that's it - they're poking up out of the pot now, very overcrowded, but I can see 10 flowers coming now - not enough, I'll need to split them up next spring...

Also, like all bulbs, this year's leaves are necessary for next year's flowers. Don't remove the leaves until they are completely yellow and brown--ideally not until spring.

Tug, in the UK, the leaves are usually going yellow by now, and usually just before or when flowering starts. They certainly disappear by mid to late autumn. Usually flowers are present with no leaves at all, or just a few withered or withering ones which people remove for aesthetic reasons.

Oops! Differing climates again! Here in the desert, they grow leaves in the winter, immediately after blooming, then they yellow and die in late spring. I forgot the effects of serious winters.

ah, well here, the leaves start growing around late spring, remain through summer, then start shrivelling and yellowing around September time, before the flowers start.

Remarkably adaptable plant!

Yes - I probably wouldn't recognise it where you are because I wouldn't expect it to have leaves after October!