I live in north Florida. I now have about 300 Amaryllis bulbs planted in the ground from a start of 30 bulbs 17 years ago. The bulbs are just now flowering but the colors have changed. Previously I had Pink and white, orange, and deep red flowers. Last year I asked a nursery man what fertilizer to use and he recommended a Rose food. I used a fertilizer that is 14-12-10 . Now all my flowers are Orange. If I start using a fertilizer that is 0-??-?? will the original colors come back?
This is unlikely. This happens over time due to many factors. Most of them are genetic. They may never return to their original color, and most likely will continue to change over time. The only two things you can do now are to sit back and enjoy the strange world of genetics, or replant with the color of your choice. Either way would be up to you. This is a very interesting thing to watch, and I enjoy seeing how flowers change over time, but others will want a certain color. Whatever you decide will be up to you and perfectly fine.
I fertilized my amaryllis. Now that the nubs have swollen into seed pods, do I clip them off or leave them on stem while I wait for them to turn color & crack open?
Leave them on the stem to ripen further. Once the pod is brown, the seeds are ready. It will take several years for seeds to develop a bulb big enough to bloom. Most amaryllis are hybrids; therefore, the flowers will not look exactly like the parent plant. Here is an article that discusses propagation methods: https://lancaster.unl.edu/hort/nebline/amaryllis.shtml
What do you do with the stems, growing leaves, and the bulb after the blossoms have bloomed and died, to keep the Amaryllis blooming again, and when would that be?
If the flowers were pollinated, then you can expect there to be a green swollen pod. If this did not happen and the stalks are starting to die, then you may cut these off. Stop watering them, and the leaves will start going dormant. After the leaves start dying off, then you can move the pot to a dark location for a couple of months. This will give them the rest they need to continue to flower again. After this, they will be ready for watering, feeding, and put back out to begin the cycle again.
This article can help: https://www.gardeningknowhow.com/ornamental/bulbs/amaryllis-hippeastrum/amaryllis-care-after-flowering.htm
Split bulb My 9 year old huge amaryllis bulb had 4 stems this year with a total of 20 flowers. I have been cutting off side bulbs to increase the main bulb. The main bulb has now split on one side (presumably from pressure) at least 1/2 way into the bulb. What should I do? Can I save it? I live in Toledo Ohio and summer it outside in a shady place - then bring it in around Oct/Nov for Xmas blooming.
Your best bet is to wait until the bulb is dormant and then attempt to split or chip the bulb.
https://www.gardeningknowhow.com/ornamental/bulbs/bgen/chipping-flower-bulbs.htm
What do I do with my amaryllis now that the flower and stem have died off and been removed. the leaves are slowly going yellow so could you please let me know what I do when they too have died off. ALSO what do I do with the bulb afterwards ie leave in pot or remove, Thanks for your help
You will want to start cutting down on water until the leaves are dried. Then you can cut the growth off. This article will direct you from this point: https://www.gardeningknowhow.com/ornamental/bulbs/amaryllis-hippeastrum/amaryllis-bulb-storage.htm
Is there a best practice for when and how to remove the withered blooms?
If the pods do not swell from pollination, then they can be removed as soon as the flowers fade. You can remove close to the base with a sharp clean blade.
This article will give you more information about their care: https://www.gardeningknowhow.com/ornamental/bulbs/amaryllis-hippeastrum/amaryllis-care-instructions-how-to-care-for-an-amaryllis.htm
I have amaryllis in pots outside. We bring them in in November in a dark place with no water. When they begin to show green usually inlate March or early April we bring them outside and water and fertilize. They r blooming now. I need to divide and repot. Can I do that now?
I would not do this now. I would wait until the next dormancy period. This will keep it from harming the plant's natural bloom cycle. This article will help: https://www.gardeningknowhow.com/ornamental/bulbs/amaryllis-hippeastrum/amaryllis-bulbs-propagation.htm