walnut is overhyped juglone can prevent seed germination but it has little effect on plants over seedling stage. I have a massive shade garden under my Juglans Californica, and there’s plenty of mustard and grass growing under wild ones, so even the seed germination thing isn’t 100%.

I planted spicezee nectaplum- it’s a beautiful tree- dark purple leaves, self pollinating and has made it to fruit production faster than plums I planted a year earlier. Excited to taste the fruit this year.

Any everbearing citrus. It’s amazing that they fruit year round. The convenience of always having a lemon, can’t be beat.

Loquat. It just grows so well where I live, even if you don’t water it. Basically you can ignore it, and it fruits in a season when there’s nothing else. I just made a batch of loquat butter in my slow cooker.