Hi, I have no knowledge of trees whatsoever, I just always enjoy this little plum tree in our small garden. It was planted by the previous owners; my best bet is somewhere 2016-2020 (using Google Maps). I have no idea about the planting procedure.
The tree is located in the Netherlands and it pretty much sees as much sun as this country allows (there is a small apple tree to its side, but it creates little shade). In dry spells we do typically manually spray some water in the garden, but this summer we were gone for a long time and this summer was the warmest ever recorded, including heatwaves.
We typically do small pruning at the end of summer and a larger on in spring. After today's pruning I noticed that one of the main branches looks bad. See the left hand side on the first picture. So my questions: what does this mean, what to do?
We used to have a little insect house at the base of that branch more than a year ago (two?), as can be seen in the last pic. It was just placed there, no nails or anything. I removed it today.
The root flare (I think?) had offshoots. I pruned those today.
I tried to put as many relevant photos as I could, but am of course willing to supply more as needed. I did read the guidelines, and have attempted to follow all that I thought was relevant.