I heard of a stable where, after each race, they sell the top horses and breed the losers. Soon that stable had some pretty slow horses.

If you sell your best trees and leave the runts, you accomplish the same thing.

Aliases of High-Grading

(1) Diameter-Limit Cut

Removal of trees equal to or larger than a certain diameter. These are the fastest growing, healthiest trees. The smaller, poorer growing trees are left behind.