How does one remove white seed like scale? attached to stems of oleander?
Most pests and fungus problems can be dealt with using Neem Oil. Neem Oil works as both an insecticide and fungicide.
Here are some links for you.
https://www.gardeningknowhow.com/ornamental/shrubs/oleander/oleander-growing-tips.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
Oleander plant is in tub in full sun and had plenty buds but they have never opened. I have now brought it indoors for the winter. How do I get the buds to open?
This article will help you pinpoint the lack of flowers.
https://www.gardeningknowhow.com/ornamental/shrubs/oleander/no-flowers-on-oleander.htm
I have 4 tall oleanders. Can I cut all the trunks down close to the ground and have them survive? They all have some nice looking shoots around the trunks that I would like to keep in place.
It is best to do a rejuvenation prune over a period of time.
This article will help you.
https://www.gardeningknowhow.com/ornamental/shrubs/oleander/rejuvenating-overgrown-oleanders.htm
I live in Las Vegas, NV, and I wonder when is the best time to cut some of the larger stalks down to the ground of my 15-25 foot high oleanders? Suzy.
The best time to prune oleanders is just after they bloom, or in late summer around August.
I'm in Southern Florida and I bought two pink Oleander bushes that were blooming beautifully. Since that first year, they have bloomed occasionally just at the top. They face the west and seem to get plenty of light. Do I need to be fertilizing them?
Fertilizer might help. Please see the recommendations for fertilizer and other considerations in the following articles:
https://www.gardeningknowhow.com/ornamental/shrubs/oleander/no-flowers-on-oleander.htm
https://www.gardeningknowhow.com/plant-problems/environmental/plant-not-blooming.htm
My bush has many dark brown pods where I think leaves should be growing. When they split open, yellow feathery substance emerge. What is this and is it normal? If not, how do I treat?
Your Oleander is producing seed pods.
Here is an article with more information.
https://www.gardeningknowhow.com/ornamental/shrubs/oleander/oleander-seed-propagation.htm
When can oleander seed pods be cut? I cut them when they dried out.
Here are some articles to help you.
https://www.gardeningknowhow.com/ornamental/shrubs/oleander/oleander-seed-propagation.htm
https://www.gardeningknowhow.com/ornamental/shrubs/oleander/pruning-oleander-shrubs.htm