Should the lower branches be trimmed? They touch the ground.
That does appear to be one, and it won't be necessary to trim the leaves unless they are fully dead. This article will help you to care for these palms: https://www.gardeningknowhow.com/ornamental/trees/bismarck-palm/growing-bismarck-palms.htm
My Bismark has a large black lesion on its trunk and several smaller ones dotted around the circumference. What could be the problem? How to treat it? If no treatment, will it kill the palm? Thanks.
My Bismarck is about 10 years old, trunk is black and the top fell off yesterday. I have another one near it and it appears healthy.
Oh boy... That was a fungal infection caused by the Palmetto Weevil. It was likely attacked by the insect and taken within a very short period.
This extension will be able to tell you more about these insects, and how to control them: https://entomology.ifas.ufl.edu/creatures/orn/palmetto_weevil.htm
This article will help you to care for Bismarck Palms: https://www.gardeningknowhow.com/ornamental/trees/bismarck-palm/growing-bismarck-palms.htm
One of our established Bismarck Palm's top growth looks like it's dying- it's limp with droopy leaves & so are the nutbearing inflorescence.
Bismarck palm leaves may show nutrient deficiencies or the effect of weevil infestation. I have provided a link that discusses potential nutritional problems, pests, and diseases of this palm. Getting a soil test may help you nail down the problem. Your state Extension Service offers low cost, comprehensive testing. http://edis.ifas.ufl.edu/pdffiles/ST/ST10100.pdf
I bought this plant in the Dominican Republic 1 year ago and I have had problems with it. Please can you help me with a solution of how to treat this plant back to health.
That is a severe case of scale, and will be VERY difficult to get rid of. Most of the treatment will be, manually, scraping all of it off to the best of your ability. Then you can treat with organic or chemical means.
These articles will help: https://www.gardeningknowhow.com/plant-problems/pests/insects/what-is-soft-scale.htm
Can I add something, a nutrient to the container to help it go back to blue? It’s on an open balcony facing west in Florida , but doing well otherwise ..
They are normally silvery green, but yours doesn't look that color either. They need the nutrients potassium, magnesium and boron, so a soil test may be in order. These plants can grow up to 60 feet if planted.
I noticed something wasn't right when four new brown shoots shot up and never opened into new fronds. Instead, the tree is accomodating the new growth by splitting in half at the top. Now there is a noticeable gap at the top.
Unfortunately, your photo did not come through. I am unable to see the damage.
It does sound like an infection has set in. Bacterial spot is common in soils that remain wet, or are too heavy to dry quickly.
I would recommend a fungicide, and to ensure that the soil has a chance to dry out down to about 2 or 3 inches between watering when possible to prevent future infections.
Here are some articles that will help: