An installer who only digs root-ball-sized holes and doesn't loosen roots is ignoring UGA-recommended practices. Dr. Tim Smalley teaches wide-area soil loosening and root untangling.
Your 3x-wide holes with loosened roots eliminated air pockets and allowed rapid root expansion. The "explosive" new growth proves the point.
All plants—trees, shrubs, perennials—benefit from generous planting holes and root loosening. The installer's "research" claim doesn't match university guidelines.
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