Was wondering what could be the cause of that brown spot.
Is this some type of plum? You should inspect the leaves, as well, to make sure you're not having insect infestation.
These articles should help: https://www.gardeningknowhow.com/edible/fruits/plum/plum-tree-diseases.htm.
https://www.gardeningknowhow.com/edible/fruits/plum/common-plum-tree-pests.htm
I have a clay pot and coconut husk
Unfortunately, those are only two pieces of a very large list of thing that you will need for this task.
That will be enough to start a few seeds, but a serious orchard needs to be started with good stock from a reputable nursery.
IN the meantime these articles will offer some information:
https://www.gardeningknowhow.com/edible/fruits/fegen
https://www.gardeningknowhow.com/edible/fruits/fegen/different-fruit-tree-forms.htm
https://www.gardeningknowhow.com/edible/fruits/fegen/fruit-tree-spacing-in-gardens.htm
https://www.gardeningknowhow.com/edible/fruits/fegen/microclimates-in-orchards.htm
We have a planter that is bordered by two block walls that is 50'-0" long and separated by about 2'-6" and presume is 7 ft deep full of dirt. What tall fruit trees can we grow that can flourish in this space?
This will be tricky. Los Angeles spans, massively, from USDA zones 7 to 11. Depending on where you are, exactly, will determine what fruit trees you can plant in your area. Since I am not certain which zone you will be located in, I would suggest looking to your local extension service. They can help you with your, specific, area.
This page will help you to find the closest to you:
Cut or pick the fruit off the branch?
It depends on the fruit, but scanning through several articles, hand picking the fruit was most suggested. We have articles that tell how to harvest specific fruits that you can search for on http://www.gardeningknowhow.com. Here are some examples:
https://www.gardeningknowhow.com/edible/fruits/oranges/harvesting-oranges.htm
https://www.gardeningknowhow.com/edible/fruits/apples/harvesting-and-storing-apples.htm
https://www.gardeningknowhow.com/edible/fruits/figs/how-to-harvest-figs.htm
https://www.gardeningknowhow.com/edible/fruits/mango/mango-fruit-harvest.htm
https://www.gardeningknowhow.com/edible/fruits/fegen/tall-fruit-tree-harvesting.htm
* Blue Ridge, GA Timing to plant garden for each plant and best fruit trees to plant?
Here are some fruit trees that do well in your zone 7.
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-7/zone-7-citrus-trees.htm
I would like to plant gardenias, bean poles, calamansi, lemons, and other vegetables.
You are in zone 8. Here are a few articles that will help you decide what to plant:
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-8/zone-8-plants.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-8/zone-8-shade-gardening.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-8
I just bought a home and unfortunately one of my fruit trees appears to be afflicted with a terrible fungal infection. The arborist I talked to recommended just cutting it down and planting in a different section of the yard, as the soil is currently contaminated with the fungus. What he didn't tell me what how long it would be before I could plant fruit trees in that part of the yard again. One year? 3 years? Forever? There has to be a way to be able to plant there again. Help!
Without knowing which disease it is, I will not be able to tell you how long it will remain in soil. In the case of viral pathogens, it will be permanent. If you plant a completely different and unrelated tree species, then it will , likely not affect the new tree. Unfortunately, planting the same tree in the spot will lead to another dead tree.
If you would like to attempt to remove the pathogen, you could try solarizing your soil. This article will help: