How and when should I cut the dead flowers off of the plant?
You can cut them off after thay have faded, unless you would like to bring them in the house as cut flowers. Then you can cut them off before the flower has faded. You can go down as far as you would like to the base.
Flowering weeds are overtaking my nice garden (curbside view) and it looks terrible. They come back every year. They are tall and have small yellow flowers. Is there a product I can put on them to kill these weeds and not my plants. They are even growning into my bird of paradise.
Do you have a picture of the flower you can send us? There are several that could fit the description and proper identification will help us give you the correct advice.
Our white bloom Bird of Paradise was hit very hard this winter. How far do we prune it? It is outside in a perfect location (had about four blooms on it and stands about 8 feet tall). It does have about three (at least 6 inches in diameter) trunks. Do we take it down to green or further than that?
Just cut of the parts that are brown. They are dead and will not come back. Leave what is green and the plant will recover.
My bird of paradise plants froze over the winter and I cut them all the way back, getting rid of all dead leaves and stocks. Will my plants come back, or did I kill them?
If the stems are still alive, they will regrow their leaves. The roots may also regrow leaves and stems. These articles will help you as well:
https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm
https://www.gardeningknowhow.com/plant-problems/environmental/tips-for-saving-cold-damaged-plants.htm
We have two giant birds of paradise which grew to over 12 feet tall in the past two years. However, this winter in Sacramento, CA there were several hard freezes and the leaves withered and died. There were also several very rainy storms throughout January, February, and March. Now in April, all the new leaves coming up are either dead on arrival or black at the tips. Also, most of the stems look black at the tips. Is there anything we can do to save the plants and get them to thrive again?
Here is an article that you may find helpful: https://www.gardeningknowhow.com/plant-problems/environmental/tips-for-saving-cold-damaged-plants.htm
My bird of paradise is very very thick and wide with much foliage in the middle. I have trimmed around the base, but feel it needs to be trimmed in the middle and also thinned out.
That would be fine and will help with air flow, which helps to keep disease from the plant.
I live in Zone 6 in the U. S. I wanted to know if the bird of paradise flower can grow where I live. I also want to know if they are annuals or perennials.
It is not hardy to your zone, but you can grow it in a container and overwinter it in your house every year to keep it alive. It is a perennial as long as it gets protection from the cold.