Jesus suggests our trees should be producing quality, not quantity. He doesn't say, "if a tree only produces six apples, cut it down". Instead he says, "if it doesn’t bear good fruit, cut it down." There are four kinds of trees.
1. Lots of apples. Good apples.
2. Not many apples. Good apples.
3. Lots of apples. Bad apples.
4. Not many apples. Bad apples.
Jesus would celebrate good apple trees regardless of the number of apples. I fear that many of us burn (or at least have in the past) the two trees with the least apples and keep the ones with the most apples, even if they were bad.