Don't know "box bush", but it looks like the leaves are alternating 90 degrees, each node, what color flowers if any? Might be a dogwood. 3/8 inch minimum, they don't grow well. After they're cut
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If it has white flowers, and white pith, probably red osier dogwood, tan pith other than white flowers, probably other dogwood. But I am no expert on dendrology, changed majors before I got that far
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Hawkdancer