Answer: As a general guideline for future reference, use the 1-2-3 Rule. The majority of a small plant's roots (annual, perennial, succulent) are in the top 1 foot of soil; a shrub, the top 2 feet, and a tree, the top 3 feet. Roots spread outwards at the same width as the canopy and slightly beyond. Try to maintain as much of the main rootball intact as you can, but depending on the size of the plant, it's not always feasible to get all of the roots. Good luck with your transplanting!
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