I have forced bulbs growing in soil. Only one flower per pot has bloomed so far. Should I cut the dead flower or leave it there until the rest bloom?
You can remove the flower part of the bulb if it is spent.
Leave the leaves as they will grow still.
Placing the bulbs in a warm location will encourage faster growth and blooming.
A cooler location will extent the bloom period.
https://www.gardeningknowhow.com/ornamental/bulbs/paperwhites/paperwhites-reblooming.htm
I followed directions online for planting paper white bulbs in water. The bulbs began to grow, and grow, and grow, no flowers just long leaves that continued to grow. What did I do wrong?
I would say it was likely an issue with the bulbs themselves, nothing that you did 'wrong'.
Paperwhites are cousins to the Daffodil bulb and first need adequate sunlight in the fields to produce a little baby bulb inside the bulb that will become the flower. Harvested bulbs need to be stored at the correct temperatures, correct humidity levels and shipped at the correct time.
Bulbs can be damaged along the way in shipping.
Inspect the bulbs before buying. Look for even colors, no brown spots, soft areas or mold on the bulbs.
The only real issue growing them at home is keeping the soil to soggy.
Paperwhites grow best on a gravel tray with the water just touching the bottom of the bulb.
I included a picture (I hope it comes out) showing what the bulbs look like, pretty much, a bad hair day. I followed directions and no flowers have appeared. The leaves have continued to grow out of control. What did I do wrong? Thank you! Helene
We did not receive the image.
It is likely nothing that you did wrong with the Paperwhites.
Paperwhites are cousins to Daffodil bulbs. They need the correct amount of sunlight when growing in the fields to form a small baby plant inside the bulb. This little embryo becomes the flower.
Damage to the bulb can happen along the way in growing and shipping.
Look for healthy bulbs with no brown spots, soft areas, or mold on them.
Bulbs can suffer root rot if grown in soggy soil, they do best growing on a gravel bed with the water just touching the root line.
https://www.gardeningknowhow.com/ornamental/bulbs/paperwhites/forcing-paperwhite-bulbs.htm
Leaves are growing but no blooms. They are inside. I'm in zone 10. Would they do better outside?
Paperwhite, botanical name Narcissus papyraceus, is hardy in zones 7 to 10, so you can move them outside. This might help a lot since having more light encourages many flowers to bloom. Check this article for other reasons why you might not see blooms:
https://www.gardeningknowhow.com/plant-problems/environmental/plant-not-blooming.htm
If it has already bloomed once, see this article:
https://www.gardeningknowhow.com/ornamental/bulbs/paperwhites/paperwhites-reblooming.htm
Is it OK to buy Paperwhites in the fall when they are available and hold them until April before forcing? Any special conditions to keep in mind?
Yes, it is possible.
Here are some links that may help.
https://www.gardeningknowhow.com/ornamental/bulbs/paperwhites/paperwhites-reblooming.htm
https://www.gardeningknowhow.com/ornamental/bulbs/bgen/preparing-bulbs-for-winter-how-to-store-bulbs-for-winter.htm
https://www.gardeningknowhow.com/ornamental/bulbs/bgen/flower-bulb-shelf-life.htm
So when I put them away for in a dark cool place for 2 weeks with the water just touching the bottom of the bulbs, don't water again until I take them out into the sun?
You don't want enough water that it will be sitting in it at all. You will just want enough water for it to reach the bottom of the pot without pooling up. It is best to try and carefully pour out any extra water if you accidentally put too much. When you move it out in the sun, then you may water as it dries, and needs it.
Here is a link for more information: https://www.gardeningknowhow.com/ornamental/bulbs/paperwhites/forcing-paperwhite-bulbs.htm
Can I replant water forced paper whites in soil and how to keep them to put in the yard next year
Here is a "how-to" for keeping paperwhites. It will take a couple of years before they re-bloom. http://homeguides.sfgate.com/make-paperwhite-bulbs-bloom-again-30317.html