Hello!

I was forwarded here because I have problems with my cherry tree which I grow in a pot on a rooftop terrace. It would be really cool if I could get some hands on advice how to go further with the tree.

I would like to bring it to fruit some times but until then I think I need some fixes on the way.

General Location: Zone 6b in Europe. Tree should be local variety. Sweet Cherry which was sold as suitable for pots but I lost the label. I do not have access to a garden so using a pot is the only way to go.

I bought the tree more than two years ago. Last year (the second) was problematic and I already encountered alot of issues. However, the tree survived and now I am seeing new issues around.

It has developed one branch where there is resin comming out of the bark.

Tree in question and live story (if needed) of the tree can be found here: https://m.imgur.com/gallery/WKjRfM8 with some detailed images of the branch with resin in question.

What I have done so far:

1. removing the pine mulch

2. using long term fertilizer pellets which i placed around the trunk on the ground and gave some hand full of new fresh soil onto the ground (to replace the mulch)

3. watering with tap water (I assumed this one will help in reducing the acidity of the pine mulch and I do not have access to collecting rain water and else)

4. (planned today) place it again onto the normal sunny and a little windy place where it was standing the last two summers.

5. removed the resin producing sub branch but there is also resin on the main branch (please see images)

What I try to find out:

1. Do I need to cut the whole branch with the resin up to the trunk away? Or could it be that the tree is stressed by the cold winter we had (around three weeks all below -7 degree C with -20 deg C as minimum reached in some nights after each others) and this will recover.

2. If 1. is yes to cut it down, is it possible to wire other branches into the direction this branch was going? The tree would look imbalanced otherwise.

3. Is there anything else I could have missed and which might be getting problematic later?

Thanks in advance!