I have a question about mulch?

I am not sure why they say mulch keeps the weeds down, but your bulbs will have no problem sprouting. I had 4 feet of snow on my tulip bulbs, shoveled the snow away and they were actually starting to come up! They are strong, maybe weeds aren't so much? Mulch does hold in moisture as well. Good luck!

If you have perennial flowers in your garden, or bulbs, they will be able to grow up through the mulch from established roots. So will perennial weeds, so your best bet before mulching is to remove as many of them as you can. Weed seeds in soil covered with mulch won't germinate, or if they do they won't have enough light to get through the mulch, so you won't get new weeds coming up. You may get some weeds germinating from seeds blown into the mulch, but they won't be rooted well and will be easy to pluck out. Make sure to check your beds regularly for sprouting weeds. Trying to grow flowers from seed through mulch will not be successful - this is why people either put in transplants, or clear the mulch away from spaces where they've put down seed until after the seedlings are up.

It depends on how thick the mulch is. Bulbs have stored considerable energy from the previous spring, so they can punch through 2" of mulch with little problem. Seeds don't have the energy reserves to drive growth through that much mulch, so weeds usually can't punch through, and if they do, they're spindly and weak and easy to pull, as long as you catch them in time. Usually, you mulch the bed after any flower seeds you've planted have emerged, or you plant flower seedlings, then mulch the bed. Bulbs will come up on their own as long as the mulch isn't too thick.

You apply it after plants have emerged. You have to hand-weed until then.

If you have a bulb bed that's still mulched after the foliage dies, you can either dig them up and replant later or you can mark their spot with small flags or stakes so you know where to part the mulch come late-winter.