The bark on my Japanese cherry is splitting. I washed with soapy water but can't find any bark lying nearby.
The weather could be the reason that the bark split. Cherry trees have thin bark and if temperatures have fluctuated significantly in a short period (such as 70 F to 90 F), the bark could have split due to this. It should heal on its own, especially if the wound is not weeping or splitting further. If the split is widening, you can try protective paper (sold at nurseries) to help hold it together while it heals. Do not cover the wound with tar or any other permanent substance as this can trap disease in the wound.
Most of the time a cherry does not necessarily have to have another tree for pollination, but it will produce more fruit on the tree year after year if there is another fruiting cherry nearby. Here is more info: https://www.gardeningknowhow.com/edible/fruits/cherry/cherry-tree-care.htm
My cherry tree is in trouble.
This can be caused by numerous problems. This article will give you some information on why leaves can turn yellow:
https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm
I have a cherry tree whose fruits are eaten by mainly black birds. I live in Queens, NY. Where can I get the netting to protect the tree from the birds?
Most garden supply centers carry bird netting and will even help you with any questions you have. There are also numerous garden supply retailers online.
I heard recently I could apply vaseline around the base of a shepard's hook to keep ants out a hummingbird feeder and was wanting to do the same with a small cherry tree. I want to be sure it won't hurt the tree. I know the bark delivers nutrients to the the tree. Can this affect the process? Any input would be appreciated. Thanks, papa :)
Vaseline is a petroleum product. As far as I know this will kill the tree. L may be wrong, but better safe than dead tree. Check for commercial products which will do the same or use wrapping paper specific to trees.
I have a cherry tree, about 8 yrs old. Beautiful tree, but no fruit. What shall I do to make it bear fruit? I have gotten 9 or 10 cherries, but none this year.
Do you see pollinators around the cherry blossoms? Cherries bloom rather early and it may be possible that poor weather is keeping pollinators from your garden that early. Take a look at attracting more pollinators as you will need all you can get that early.
Also, I would look to a phosphorus deficiency. This can cause problems with plants that produce fruit. Give it a high phosphorus fertilizer or add bone meal to the soil.
What do I do now that the sap is leaking out of the trunk? Should I try to remove it or leave it and protect it for this winter? I really like this tree and I don't want to lose it.
This is peach borer. While it mainly affects peaches, it can affect any stone fruit. This article will help with it: https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-borer.htm