Followed instructions and the plant in big pot in full sun. Watered thoroughly before going on 4 day vacation. Upon return, plant leaves are dry. Live in Los Angeles, weather hot 80-90 degrees. Help!
Yes, plants in containers outdoors can dry out quickly in the heat. Try watering it again, but moderately in case it has trouble absorbing water. Don't soak it until it shows that it's healthy again. You can also move it to the shade while it recovers. Hopefully your plant will revive.
https://www.gardeningknowhow.com/plant-problems/environmental/under-watering.htm
We planted a bottle brush tree for almost two years. It has grown well, and has always flowered. What concerns us is the stalk does not appear to have gained any girth. I'm sure if I removed the stakes that it would snap in two. Is this common? Does it take time for these stalks to gain girth? Thanks, Rich Gilbert
This is referred to as "legginess" in trees, and it is commonly a result of low light exposure or nutrient imbalances. See this article for more:
https://www.gardeningknowhow.com/plant-problems/environmental/established-plants-leggy.htm
Pruning, along with fixing any issues with light and nutrition, will help your tree become sturdier. You may want to encourage it to grow multiple trunks instead of just one. See these articles on pruning and care:
https://www.gardeningknowhow.com/ornamental/shrubs/bottlebrush
/pruning-bottlebrush-plants.htm
https://www.gardeningknowhow.com/ornamental/shrubs/bottlebrush/growing-bottlebrush-plants.htm
I have an established bottle brush tree. Just got new sprinkler system in the yard. Leaves are turning yellow. Is this too much water?
Yes, yellowing leaves can be a sign of overwatering. Often the leaves will begin dropping soon after they turn yellow. For now, stop watering to let the plant recover. Then begin again with less frequent and/or smaller volumes of water at each watering.
Here is some information on overwatering. Underwatering can cause some of the same problems, such as wilting, but you will eventually be able to tell the difference.
Can I get a seed from a blooming shrub?
Yes, this article will help you with propagation methods for a Bottle Brush.
https://www.gardeningknowhow.com/ornamental/shrubs/bottlebrush/propagating-bottlebrush-plants.htm
My bottle brush plants are bare on the bottom but about 3/4 up have leaves. What would cause this? Could it not be getting enough sun?
It is possible that you actually have a variety of Bottlebrush that is a tree instead of a shrub genus.
Many people prune the Bottlebrush to be a tree form and have a single trunk.
You may be doing nothing wrong and the plant just growing to it's natural state.
Here is a link to refresh you on the care requirements.
https://www.gardeningknowhow.com/ornamental/shrubs/bottlebrush/growing-bottlebrush-plants.htm
The bush is at least 4 years old, beautiful green, very little or none of the flowers that are supposed to come blooming. Any advice? It has been fertilized its second and third year.
A Brush Tree needs a sunny location with at least 6 hours of sunshine.
Only prune after it has bloomed heavily, if it has a few flowers; avoid pruning these off the tree.
I would also have a soil test done. If you have too much Nitrogen, this will inhibit flowering.
Over fertilizing is also a reason for excessive Nitrogen in the soil.
You can give the tree an application of Phosphorous to promote flowering; Bone Meal is a good way to add Phosphorous to the soil.
Here are some links with more information.
https://www.gardeningknowhow.com/ornamental/shrubs/bottlebrush/growing-bottlebrush-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm
I have a bottle brush tree and two little john shrubs, zone 9, Las Vegas. They have been pruned earlier this year and I've worked with the soil in terms of compost, fertilizer, water, etc. They have bloomed a little bit, but not significantly. Now, they are yellow/green/red in color and still some of the branches are bare. Are they dying, or is there something else I can do to make them look better? Many thanks in advance and Happy New Year!
A pH problem could be responsible. The bare branches could suggest a disease like Verticillium wilt, especially if the branches are dying. Unlike in other plants, Verticillium wilt is usually mild in bottlebrushes, weakening the plant but not killing it. Please see the following articles:
http://extension.illinois.edu/hortanswers/detailproblem.cfm?PathogenID=26
http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/verticillium-wilt/
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
http://pss.uvm.edu/ppp/pubs/oh34.htm