Is there a product to seal damaged area?
In most cases you should not cover wounds on a tree or apply any sealing material.
Here are some articles with more information.
https://www.gardeningknowhow.com/ornamental/trees/tgen/lightning-damaged-trees.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/repairing-tree-bark-damage.htm
I have used Resolva tree stump killer on a dwarf conifer. I would like to know how long to wait until it is safe to replant area?
Make sure you read the label for information regarding this specific product.
Follow the manufacturers recommendations.
If the label is not clear, contact their customer service directly.
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-stump-removal.htm
One of our conifers has gone brown. Does that mean it has died or can it be save? Another one is turning brown, can this one be saved.
These articles will help you identify possible causes and measures you can take to potentially save the trees:
https://www.gardeningknowhow.com/ornamental/trees/pine/pine-tree-browning.htm
https://www.hort.purdue.edu/mg/pubs/Conifer-Dieback.pdf
I have several spruces with some sort of disease. The needles turn brown then the limb. It seems to start close to the trunk, low in the tree then spreads to the top. Please see the attached photos. Any ideas on what to do to stop/prevent this? Thank You, J. Horne
These actually look like junipers or arborvitae. There are several pests and diseases that can cause juniper trees and arborvitae to turn brown and unfortunately, some of these are not treatable.
The following articles may help you determine what the problem is. Also look into which of the pests discussed in the articles are prevalent in your region.
http://www.clemson.edu/extension/hgic/pests/plant_pests/shrubs/hgic2056.html
http://ucanr.edu/sites/mgslo/newsletters/juniper_branch_death28050.htm
http://aces.nmsu.edu/ces/yard/2000/052000.html
http://extension.wsu.edu/snohomish/juniper-troubles/
http://web.extension.illinois.edu/askextension/thisQuestion.cfm?ThreadID=5989&
My tree has suddenly turned brown. Is there any way to save it?
This could be the result of too much or too little water, several diseases, or other sources of stress. This article should help:
https://www.gardeningknowhow.com/ornamental/trees/pine/pine-tree-browning.htm
Maple tree leaves on branches are drooped, edges curled under, and light green. They do have any spots or browning on the edges. We have hostas planted around base and have mulched under the tree. What is wrong with the tree? I don't believe it is Maple Wilt caused by a disease because the leaves are not scorched around the edges or are turning brown. Please advise.
The spots visible in the picture are commonly caused by tar spot, a fungal disease. However, this is not usually damaging to a tree's health:
http://msue.anr.msu.edu/news/why_do_my_maple_leaves_have_spots
The drooping leaves could be a separate problem, perhaps lack of water during the summer heat. Also make sure the mulch is not right up around or heaped against the tree's trunk, because this can harm trees:
About 1 foot away from back of my house, there is a Chinese fruit tree sprouting out from nowhere. My friend asked me to keep the tree for her. I kept for six months. She changed her mind, not wanting the tree anymore. I cut down the tree and dug out the root about 1 foot below surface, but I could not find the end of the root. The root has run away very deep and very far to draw water. In your website, you said putting mulch over it will suffocate the root and will kill the tree. Are you sure it will work? How much time will it take mulch to suffocate root? Will covering the root with one foot deep mulch be enough? If it works, after much kills root and tree, can I remove mulch and fill up 1 foot deep hole with dirt to grow other plants above it?