Something is eating the Brugmansia's leaves. What can I do?
Spider mites, aphids, and cabbage worms are among the most common pests of this plant--all of which can be taken care of by treating the plant with neem oil. Here is more information: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm
If you don't see any signs of insects, it could also be attributed to slugs, which normally come out and feed at night. This article will help: https://www.gardeningknowhow.com/plant-problems/pests/facts-about-slugs-and-how-to-kill-garden-slugs.htm
I have a cutting grown Brugmansia...'Peaches n' Cream.' It's one year old in a large pot (15" x 14"). It looks healthy. I water every day, and fertilize often (Miracle Grow). Why doesn't it bloom? It's about 2 ft. tall and has many healthy leaves.
You may be adding to much Nitrogen which will make lush green plants and no flowers.
Adding Phosphorous will help. Bone Meal is a way to do this.
Here are some links for you.
https://www.gardeningknowhow.com/ornamental/trees/brugmansia/growing-brugmansias-in-containers.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm
Here are my 2 questions: Can the roots of a Brugmansia crack a wall or a house's foundations? (e.g. roots of 10 cm diameter) Once the stump has been taken out, can any remaining roots (e.g. 10 cm diameter) left in the soil grow again into a tree? Thanks for your help.
Any tree can technically crack walls and foundations. They will do this when they don't have enough room to grow otherwise. The question is not so much can brugs do this, but is there enough room for the tree to grow so it won't do this.
Over the course of its life, trees typically need the space of the width of their mature size canopy plus 3-4 meters beyond to be happy (and non-destructive to walls and foundations). They can grow in smaller spaces but the more confined they are, the more likely they are to cause problems eventually.
They can regrow from roots. You can stop this from happening by painting the fresh cut of any root left in the soil with Round Up. The remaining root will suck it in and die.
I have had this plant for 2 seasons and it blooms 4-5 times a year. This latest blooming had produced deformed flowers. It's like the petal/flower is not joined up. Any ideas?
As long as you are not seeing any other signs of disease or insects on the plant, I think this is more likely a fertilizing issue.
Review the links below and make adjustments to your fertilizer schedule.
A soil test can be preformed easily to take the guess work out of this.
https://www.gardeningknowhow.com/ornamental/trees/brugmansia/growing-brugmansias-in-containers.htm
https://www.gardeningknowhow.com/ornamental/trees/brugmansia/prune-brugmansia-trees.htm
https://www.gardeningknowhow.com/ornamental/trees/brugmansia/fertilizing-brugmansias.htm
https://www.gardeningknowhow.com/ornamental/trees/brugmansia/brugmansia-diseases.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
I have a big, old brugmansia grown from seed. After about 5 years, a small plant come up in the same pot. It is a Datura. There is no way I know that a Datura seed could have gotten in the pot. Can you explain this?
Since the Brugmansia is likely a hybrid, this could explain the seedling that is growing is not of the same cultivator as the mother plant.
Here are a few links for you.
https://www.gardeningknowhow.com/ornamental/trees/brugmansia/tips-for-propagating-brugmansia.htm
https://www.gardeningknowhow.com/ornamental/flowers/datura/growing-datura-trumpet-flower.htm
My brugmansias get flower buds and they get to be pretty far along and then the plant throws them before opening. I had a Wreckless Mess with 36 buds on her and within a week had thrown all but one. I have had a few others do the same thing. What causes this and how do I rectify it?
This happens typically due to uneven watering, especially if they are in containers. Brugs are water hogs and in containers, they tend to use up the water available quickly, which leaves them too dry a bit later in the day. This stress can cause them to lose blooms.. Try increasing the frequency of your watering.
If you feel the water is enough, you may have a thrip infestation. These are tiny insects that attack the base of flowers and will cause the flowers to drop before they open. They are so small that they are often difficult to detect. They can be treated with a standard pesticide.
I planted brugmansia seeds, and when they come up they get about 2 inches tall then wilt and die. I don't know what I'm doing wrong. My seedlings die when they are only a day old...the leaves will be full, then shrivel, fall off then the rest dies.
This could be damping off, which is a fungus that effects seedlings.
Also if the seedlings are exposed to bright sunlight they can burn up and die quickly.
Make sure you are using a good sterile soilless potting mix and keeping seedlings moist. Not to dry or to wet.
Here are some links that may help you.
https://www.gardeningknowhow.com/garden-how-to/seeds/what-is-damping-off.htm
https://www.gardeningknowhow.com/garden-how-to/seeds/when-to-start-seeds.htm
https://www.gardeningknowhow.com/garden-how-to/seeds/soilless-seed-mix-info.htm
https://www.gardeningknowhow.com/ornamental/trees/brugmansia/growing-brugmansias-in-containers.htm