By TreesAreGood®
International Society of Arboriculture
Buying a High-Quality Tree
A high-quality tree, when planted and cared for, can become a long-lasting asset to your property. A low-quality tree may develop costly problems over time, increasing the need for maintenance and reducing the benefits a tree can provide.
Signs of High-Quality
High quality trees generally have a straight exposed trunk free of wounds and damages, well spaced branches, and a root system where roots grow straight out from the trunk.
Signs of Low-Quality
Low-quality trees commonly have a weak form, wounds from handling, or incorrect pruning, and the roots may be limited, crushed, circling in an undersized ball or container. These problems can greatly reduce the tree’s prospects for a healthy and productive life.
Branch Architecture
Good strong branch architecture starts with branches evenly spaced along the trunk. Branches should have sturdy attachments to the trunk. When several branches are growing at the same position on the trunk, the likelihood of weak attachments, compression, and cracks increases greatly.
Multiple Trunks
Homeowners who desire a tree with multiple trunks should make certain that the trunks are well separated at the ground line. Remember, trunks expand in diameter as they grow. Two trunks may be slightly separated when small, but as they grow the trunks will squeeze together.
Checking the Trunk
Always check the trunk thoroughly when purchasing a new tree. If the tree is wrapped, remove the wrap and insect the trunk for wounds, incorrect pruning cuts, and insect injuries. The wrap can be used to protect the trunk during transit, but removed before planting.
Injury vs Pruning Cuts
A correct pruning cut removes the branch just outside of the collar. A ring, or “doughnut,” of tissues then grows around the cut. Do not make cuts flush to the trunk. Trunk tissues above and below a flush-cut branch often die, creating dead spots.
Which Stock to Buy?
Each type of tree has a unique root system. Bare roots are not surrounded by soil and are usually found on small trees. Balled-and-burlapped roots are surrounded by soil and held together with wire or rope. Trees that are sold in a container generally have their roots in soil.
Bare Root Stock
Bare roots should not be crushed, dried out, or discolored. The ends of the roots should be cleanly cut. Damaged roots may be cut cleanly prior to planting and watering. Bare roots are easy to transport and plant. However, they need to be planted soon to prevent root drying
Balled-and-Burlapped Stock
The trunk flare should be visible at the top of the root ball. Avoid badly damaged or compressed root balls.
The diameter of the root ball should be at least 10–12 times the diameter of the trunk as measured 6 inches (15 cm) above the trunk flare.
Container Stock
With container-grown plants, the trunk flare should be visible. Roots should not twist or circle in the container. Circling roots may girdle and kill other roots or the entire tree if wrapped around the lower trunk. Fine circling roots may be cut away at planting.
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