A tree needs sunlight to produce fruit. Christians will experience a drop in fruit production when walking in darkness. We need Son-light.
The fruit of the Spirit is not a basket of different fruits from which you get to pick and choose, it is something you should be growing all together, like a cluster of grapes or a specific type of fruit on a single tree.
Jesus is the Vine and we are the branches. He does the sustaining and it is our job to produce fruit accordingly. God is the Vinedresser, and frequently prunes certain parts of the branches to take away that which isn’t useful, thereby making way for more fruit production.
You can tell a lot about a plant based on its fruit. You can tell a lot about a person based on what they produce and grow in their lives.