how much bigger can tree/shrub container be?

<?xml version="1.0" encoding="UTF-8"?><md>I'm new to container gardening. Zone 7 (90-100° for 2 months, below 30° for 2-3 months). Need to understand the impact of using 19-22 inch containers (around 15 gallons) with 2-3 gallon shrubs. I've got delightful Osmanthus Fragrans (tea Olive) and Camellia Sasanqua Yuletide for Fall/Winter interest.

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