I have an outdoor yucca (Adam's needle) that has outgrown its location. What is the best method AND time of year to move this plant?
Spring is a good time for transplanting, as is fall. They normally take to transplanting quite easily; however, just to be safe, this article will help with preventing transplant shock: https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm
How and when can I 'prune' my twenty foot high Yucca tree? One of the trunks is leaning over my garage. Can I remove this trunk without damaging the growth of the tree?
This article should help: https://www.gardeningknowhow.com/ornamental/foliage/yucca/yucca-plants-care-and-pruning-tips-for-pruning-a-yucca.htm
What do you do with the fruit of the yucca? Can it be used to grow more plants?
This article will help with propagating yucca: https://www.gardeningknowhow.com/ornamental/foliage/yucca/propagation-of-yucca-plant.htm
How frequently should I water my yucca plant outside?
Yucca plants are very drought tolerant, like a cactus. They only need to be watered when they become overly dry and should be watered just enough to get the soil good and moist. They are generally fine with a thorough watering about once a month, maybe twice if grown in pots.
After the yucca has bloomed and the petals are all falling off, what should you do with the tall stem?
It can be pruned off once it is done blooming. Here is an article about pruning the yucca plant: https://www.gardeningknowhow.com/ornamental/foliage/yucca/yucca-plants-care-and-pruning-tips-for-pruning-a-yucca.htm
My yucca plant has flowered and they have now died off. How and when do I cut the dead stems, and how far down on the plant? Also, if I want to trim plant back, do I cut from the top? I have had plant for many years and it needs some trimming also.
The following article should be of some help to you: https://www.gardeningknowhow.com/ornamental/foliage/yucca/yucca-plants-care-and-pruning-tips-for-pruning-a-yucca.htm
I want to know if my large outdoor yucca plant, about 33 years old, could be dying. The upper leaves are still very green, but the lower leaves are browning. Some of the branches in back, those getting the least amount of sunlight, have fallen. How do I save this plant? And if I can't, how do I remove it?
These plants seldom have any problems. You may just need to prune it. Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/foliage/yucca/yucca-plants-care-and-pruning-tips-for-pruning-a-yucca.htm