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This is usually determined by the environment. To turn red, the tree will require temperatures between 32 and 45 degrees. This cool snap is what initiates the red.

Here is an article that will help: https://www.gardeningknowhow.com/ornamental/trees/tgen/keeping-red-trees-red.htm

I think you are right on the mark. They need full sun to be able to get their brilliant red color. It also helps if the temperatures are a little cooler as well. Here is an article that will give you some more information: https://www.gardeningknowhow.com/ornamental/trees/tgen/keeping-red-trees-red.htm

Hello,

Thank you for sending us your gardening question. Burning bush will develop its full color only when planted in full sun, defined as 6+ hours. When planted in partial sun (either part east, or part west sun) the bush may show some, to no fall color - that spectacular red-orange that we all love. If location is the problem for your bush receiving sufficient sunlight, you may consider relocating it.

Here are a couple of articles you might find helpful:

https://www.gardeningknowhow.com/ornamental/shrubs/burning-bush/burning-bush-care.htm

https://www.gardeningknowhow.com/ornamental/shrubs/burning-bush/how-to-move-a-burning-bush.htm

Please let us know if you have any other gardening questions and happy gardening!

Thanks
Gardening Know How

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You can, actually, plant them in the fall. It may be getting a little late, as it is starting to cool off, but if you believe you have missed the planting time then you may wait until spring.

Here is an article for more information on the care of this shrub: https://www.gardeningknowhow.com/ornamental/shrubs/burning-bush/burning-bush-care.htm

The most common reason for burning bush to fail to turn red is lack of enough hours of sunlight. However, there are also variety differences, with some specimens not producing as much of the red color. If possible, moving the bush to a full-sun spot would be the best option. Here is more information:
https://ask.extension.org/questions/158805

Yes, you can leave more than that, as much as you'd like. It is best to cut them back in early spring, but if you really can't get to them then, you can prune in late fall.