If you plant junk seeds you will inevitability harvest junk trees. Junk refers to inferior tree seeds derived mainly from inbreeding, collected from a narrow genetic base and uncontrolled hybridization.
Junk also arises from indiscriminate seed collection from non-superior trees.
I. Meeting Short term seed needs Genetically improved tree seed production is a long term objective. However, when quality tree seed is required for immediate planting, the following guidelines should be observed. A. Collect seed from superior individual trees from large populations. Caution should be exercised since superior trees could be the result of environmental effects. Do not collect seed from all the trees in a population.