University of Florida

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Unstable trees resulting from circling roots

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unstable cliper oak from circling roots

5000 two inch caliper oaks growing in a field nursery tipped over in a 60 mph wind storm with ample rain. The cause for most tipping was circling roots. Most roots were circling or were directed down the container sides when trees were in the container nursery prior to planting into this field nursery. Trees with straight roots are more likely to remain erect in a wind storm that trees with circling roots.