The sycamore was planted on our front yard and has been cracking our water lines for watering the grass. We just decided to remove the sycamore tree because the previous owners of the house must have planted it without really knowing how aggressive its roots can be when planted close to the house. So now, my husband wants to keep the tree stump and its roots are showing. Is it advisable to keep the tree stump?
It may try to grow back, but it will eventually decay. If it sprouts you can use chemical means to stop it or have the stump ground.
In the meantime you can use it to grow flowers!
https://www.gardeningknowhow.com/garden-how-to/projects/tree-stumps-planters.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/kill-zombie-tree-stump.htm
Got a new house where the original owner had mixed species of various sycamore ground covers. What is the generic method of trimming ground covers by 3-4 feet of height?
I'm not aware of any Sycamores that grow in a crawling, ground cover manner. They are upright trees, most of which get very tall.
As a general rule, you will only want to trim 1/3 of a plant at any one time. There are some exceptions, but sycamore trees follow this rule.
This article will help: https://www.gardeningknowhow.com/ornamental/trees/sycamore/sycamore-tree-pruning.htm
This is my friends London plane. It is suffering sparse foliage but the thing I'm puzzled by is the damage to the trunk and bark. This photo is one metre up the trunk. I can't decide if it's wilt, anthracnose, a borer pest or massaria. Can you help?
That is classic tree borer damage! This article will help:
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-borer-insects.htm
I noticed some leaves are falling from my sycamore tree. I went to inspect my tree and saw some good size holes on the tree. Some of the holes are pretty deep at least 2-3 inches deep. Is there anything I can do to prevent my tree from dying? Or is it time to remove the tree? Thank you in advance for any advice you can provide.
Once it gets to this point, there is no saving the tree. Replacing it before it falls apart will be the best course of action. This article will offer some more information:
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-borer-insects.htm
Today my uncle has his sycamore tree cut. The person who cut it was supposed to just trim it but instead had cut off half way through all the branches. It was a really nice tree and now ruined. Will it grow back?
It is far from ruined. That tree was done a HUGE favor. Pollarding anything in the Acer genus will help keep it manageable, promote airflow, and cause a much bushier growth.
Two years from now, you will have a tree that far exceeds the beauty of an untamed tree.
Here is an article that will help you to understand what has happened:
https://www.gardeningknowhow.com/ornamental/trees/sycamore/sycamore-tree-pruning.htm
I notice that the leaves on other neighborhood Sycamore trees are just starting to fall.
This can happen due to cultivar differences, care differences, or even differences in soil pH and nutrient content.
It will be very hard to say which factor is at play, but I could be any of those.
This collection of articles will help you to give the tree the best care:
What would be a better choice , sycamore or walnut ?
You can, but just barely. They beat out the Walnut in hardiness, just barely, as well.
https://www.gardeningknowhow.com/ornamental/trees/sycamore/sycamore-tree-care.htm
This article will help you to find something that will grow well in your zone:
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-4/growing-trees-in-zone-4.htm