Gall – A localized swelling of branch or stem generally caused by fungi, bacteria, insects or a physiological disorder.
Gas Exchange – Represents the amount of air exchanged within the soil volume. It is inhibited by high compaction and fine textured soils.
Girdling Roots – Roots that grow around the trunk in a circular manner, constricting other roots or restricting trunk growth.
Good Structure/Architecture/Form – Branch and trunk architecture resulting in a canopy from that resists failure.
Guy – Hardware used to provide support to the tree following transplanting. Installed from the trunk or a lateral branch to an anchor placed below ground.
Gypsum – A mineral composed of hydrated calcium sulfate used as a building material and as a soil conditioner

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