Should you trim the dead blooms off?
Yes, you can prune them off in the Spring if you left them for Winter interest.
https://www.gardeningknowhow.com/ornamental/shrubs/bottlebrush/growing-bottlebrush-plants.htm
Are the flowers poisonous for dogs? My great dane has been eating some of the fallen blooms. Thank you.
The ASPCA lists Bottle Brush Tree has non toxic to dogs and cats.
Can I get the bottle brush bush to root from cuttings?
Propagate 6" cuttings from the weeping portion of the shrub in summer.
Here are some articles to help you.
https://www.gardeningknowhow.com/ornamental/shrubs/bottlebrush/growing-bottlebrush-plants.htm
https://www.gardeningknowhow.com/ornamental/shrubs/bottlebrush/propagating-bottlebrush-plants.htm
Does an automatic streetlight affect a bottle brush? If there is a charge, please do not answer.
There is no charge for receiving advice from our expert gardeners!
All I can say is that it is possible. Some research studies have shown that artificial night time light from sources such as street lamps affects the growth and flowering of plants and even the number of insects that depend on those plants for food.
Source: http://www.exeter.ac.uk/news/featurednews/title_440900_en.html
I forgot to cut off the flower heads when it finished flowering so it has all these pods. Should I cut them off or just leave it till this year's flowering is over and do it then? Will it flower this year if the pods are still on it? Hope you can help. Thank you.
I would dead head and prune the seed pods from the plant.
This should not effect blooming on your Bottle Brush Tree.
https://www.gardeningknowhow.com/ornamental/shrubs/bottlebrush/growing-bottlebrush-plants.htm
My bottle brush seems to be dying. The flowers and leaves are turning brown. I bought it about 3 weeks ago and planted in pot. At first it was fine but now looks awful. Can you help?
Your Bottle Brush needs full sun growing location.
This shrub can get quite large, though some compact varieties may do fine in containers.
Check the soil, the soil should be moist but never soggy.
Make sure the pots have adequate drainage.
The link below will refresh you on the care requirements.
https://www.gardeningknowhow.com/ornamental/shrubs/bottlebrush/growing-bottlebrush-plants.htm
I had three mature bottlebrush trees on my purchased property 3 years ago. Two died, one still remaining. Remaining one did not bloom last year, however, this year is beginning to blossom. It gets weekly watering, base covered with wood mulch, but I don't know what kind of commercial fertilizer (besides compost) is required. Does my existing tree require a male or female (?) companion for fertilization?
It does not need a companion to bloom and they are relatively maintenance free. Compost is the perfect fertilizer along with mulch and a healthy watering schedule. If you prefer to go the chemical route here is a link on what to choose;
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/giving-plants-a-boost-with-conventional-fertilizer.htm