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Is it feasble to grow pyrocanthas in deep planters? I want to create a intruder resistant hedge on a paved patio that has no earth. If so, how deep would the planters have to be?

Are these human intruders, and if so might there not be a better way? Intruders would only have problems if the plants were 5ft tall and really thick. Not sure that this would be quickly achievable.

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