I wouldn't plant them in one hole, check this out for more information on your plant:
Generally, you'll want to plant, any plant with its mature size and needs in mind.
Avoid planting things that will be wide at maturity too close to the driveway or street; avoid planting things that will be tall at maturity too close to power lines or roof lines; avoid planting anything with a deep and/or widespread root system too close to paving, sewer, water, and electric lines.
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