Q.sour oranges how do I get them sweet
I have a small orange tree in a container about 3yrs old and 4 ft tall. It produes small golf size oranges (25) each year but they are sour. Is there any way to get them to grow sweet oranges? Thank you

This can be pinpointed to a few different things. It can mean the oranges need more time on the tree, or it can mean that the tree is lacking in fertilization. There are a few other likely causes as well. This article will help understand why this is happening and offers solutions to help prevent this:
https://www.gardeningknowhow.com/edible/fruits/oranges/oranges-taste-sour.htm