Shade trees grown in the nursery should have a strong central leader even if the leader will be lost at maturity. Temporary
branches are important to trunk development because they build a strong trunk and root system. Good root systems start in the
nursery at propagation in the liner stage and require attention each time a tree is shifted into a larger container. Installation
contractors must provide simple root and shoot pruning treatments at planting to ensure that sustainable landscapes are created.
The follow document have been developed to help industry professionals.
Specification Guidelines for Container-grown Trees for California.
This document's intent is to help landscape professionals develop their own comprehensive and detailed specifications to ensure
that they obtain high quality container-grown nursery trees. The document is also intended to help nursery professionals in their
efforts to improve the quality of trees grown in California. These specifications can be modified for specific simulations.
Recommendations for improvements to the document received in the past 5 years have been incorporated in this 2009 revision.
Strategies for Growing a High-Quality Root System, Trunk, and
Crown in a Container Nursery. This document presents strategies to assist growers in producing trees that conform to the
Guideline Specifications for Nursery Tree Quality. The strategies are based on most-recently-published and ongoing research,
combined with the knowledge, skills, and know-how of both the practitioner and researcher, to produce high-quality root systems,
trunks, and crowns. As research progresses and new strategies are developed, this document will be revised to incorporate