I tend to use hardware cloth (either 3 or 6 mm openings and goes by
several other names) which has heavier wires that window screening for
the box bottoms. The roots that grow through the mesh do not cause much
damage, particularly when cut off once a year to move the box. In
addition, I suggest using a coarser soil than garden soil since this
permits better aeration and fluid (read fertilizer) flow and therefore
faster growth.

Marty

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