You can get bulb fibre compost especially for bulbs, although I think a lot of people just use regular compost.

When I empty out my planters, I tend to put the spent compost on my flower beds, minus most of the roots.

Donna, bulb fibre is specifically for indoor bulbs, not suitable for outside ones.

You can use good multi purpose compost, or John Innes No. 2, or a mix of the two. Pot needs good drainage, so turn your bulbs out, clean the pots, or get new ones, make sure the drainage holes are open, fill with compost, replant your bulbs. And then feed them next year as the flowers die back, but while the leaves are still present.

Thanks Bamboo, I didn't know that about the fibre! Why's that then?

When you grow bulbs for flowering indoors, they've been treated - they don't really need soil at all, will grow perfectly well with their roots sitting in water (think hyacinth jars), but if potted for indoors, are usually contained in something that has no drainage holes - bulb fibre is just a sort of fibrous mass with no nutrients which retains water for the roots, without hanging onto too much so that the bulbs rot.

THANKS