I’m going to stretch the definition of tree and answer with blueberry bushes. I have planted all sort of fruit trees, but in my climate it’s difficult to get high quality fruit without using pesticides. Pest pressure is significant. The blueberries on the other hand require little maintenance and they thrive even in depleted soils. I also like that the berries ripen over the span of a few weeks, so it’s not as much of a rush to pick and process everything all at once. I’m in zone 7b/8a, but there are a variety of cultivars that do well from USDA zones 3-9.

True. If your gut has decided that its purpose is to hate you and everything you eat, then no amount of fiber will convince it otherwise.

IBS isn’t always lifelong though. I hope you can work out a diet that avoids angering the growling intenstinal gremlins.

Fiber helps with that as well.