Chemical Root Pruning of Coniferous Seedlings1

Abstract

Conifer seedlings of 10 species from 6 genera were raised in containers coated on the inside with basic cupric carbonate in latex paint. The copper paint prevented lateral roots from growing down or around the container wall. After transplanting, the chemically root-pruned stock was capable, in most cases, of vigorous root growth. The effectiveness of the chemical root pruning treatment varied with species, container size, growing medium, and the concentration of cupric carbonate in the container wall coating.