Can I keep in cedar box, open just the bottom of cedar box and put in the ground?
You can grow a Bottle Palm in a container. This Palm is quite slow growing and does not have a large root ball.
For this reason I do not see any need to plant the Bottle Palm in the manner you describe.
This type of planting is done for invasive root systems that the Bottle Palm does not have.
Here is a link with more information.
Two of my bottle palms are almost dying. Please see the photos attached and advise how to save them.
Unfortunately I cannot identify the issue from these images.
Inspect the fronds, the trunk and the soil around you.
You can have a soil test performed to help determine if the palm is lacking nutrients.
I'm listing these links to help you.
Can someone help me identify what type of palm this is? Thank you.
It looks like, either, a bottle palm, or its cousin the spindle palm. You can ask your local extension service, and they can help you figure out exactly what this is. This link will help you locate the nearest one to you: https://www.gardeningknowhow.com/extension-search/
A google search of "palm tree fertilizer" will take you to many results. It is your choice from there.
I live in Miami Florida . My concern is looks and length of the leaves will interfere with the mail box and view of the house. So no pictures.
This will be completely up to you. The bottle palm will develop a slightly fatter trunk, but there is not much difference between the two besides this.
One stalk of my three-stalk bottle palm has lost its leafy top. Does this indicate a potentially fatal threat to the entire plant or is random leaf-loss on any stalk a natural periodic event (meaning the plant is 'fine')? If this isn't normal, should I remove the leafless stalk at the base, leaving just two stalks, or should I attempt to treat the leafless stalk (and if so, with what/how)? Thanks for the help!
In this case, a photo will help greatly. This could be a number of issues, from fungal/bacterial, to a pest physically eating your leaves, to even wind damage.
A photo will help me to determine what course of action needs to be taken.
In the meantime, this article will give you information on the care of these palms: https://www.gardeningknowhow.com/ornamental/trees/bottle-palm/caring-for-bottle-palm-trees.htm
My 12 year old bottle palm is growing a stalk of leaves (fronds) out of the top. Is this new growth okay, or should it be pruned away?
It sounds like what you are seeing is a flower stalk. You can leave this until it dies off naturally. If you can include a photo, I would be able to see what it is and help you better.