We had the tree planted but our soil is very much clay and so didn’t drain well and the tree started to die/rot and lost all its leaves so we dug it up and put in a large pot ( with good drainage) new leaves started appearing and now they are becoming tinged with brown
Likely, this may be either Phytophthora or Anthracnose, which encompasses several fungal pathogens. Wet and compact soils will make it easier for infections to take hold. Once it does, then it might remain within the tree for quite awhile. Whichever it may be, it is likely that the disease was transferred during transplant.
https://www.gardeningknowhow.com/plant-problems/disease/what-is-phytophthora.htm
https://www.gardeningknowhow.com/plant-problems/disease/anthracnose-disease.htm
My friend has a beautiful Weeping Cherry Tree that used to blossom beautifully. Her dau-in-law trimmed it the year before last and since then, last Spring and this Spring - there are only blossoms at the very tips of the branches, all the way around, sort of like a little flounce on a bare skirt. Totally bald on top and sides. Otherwise it leaves out nicely for the summer. Is there any help for this tree? Thank you so very much. This is Lancaster County, PA - a very beautiful place for flowers and blooming trees. Sorry I don't have a picture.
It could be due to winter injury, too much nitrogen, or pruning at the wrong time or too much. Here are some articles that should help:
https://www.gardeningknowhow.com/ornamental/trees/weeping-cherry/weeping-cherry-growing-tips.htm
https://www.gardeningknowhow.com/ornamental/trees/weeping-cherry/pruning-weeping-cherry.htm
https://scholar.lib.vt.edu/VA-news/ROA-Times/issues/1990/rt9007/900715/07160296.htm