I've been advised while I am potting bulbs into pots to stand the pots in a tray with gravel in the bottom. Why would I have to do that?
What sort of bulbs are we talking about?
Just any they said while you are starting bulbs off you should stand on gravel?
Normally when you're advised to stand pots on saucers or trays of gravel it's so you can increase the humidity around the plant - important for many houseplants. But I doubt that would be the reason here, whatever the bulbs... Maybe it's for the opposite reason - so the pot doesn't stand in a saucer of water so the compost becomes waterlogged? Never bothered myself...
I'd be interested to know where the advice came from. I've been racking my brains to think of any bulb that would benefit from such treatment.