Our containers at Ore Inc. are made out of 14-gage mild steel. 14-gage is approximately 1/16 of an inch thick. According to US Steel, the rate of deterioration of unfinished steel in an exterior environment is the loss of ½ the thickness, or 1/32 of an inch, in ten years. Therefore, one could assume 18-20 years before any rusting through could occur.
All of our containers come with drain holes and intend on being directly planted in. It is not necessary to use grow pots, however, some of the designs have been fit with interior shelves to hold grow pots and saucers or to reduce the amount of soil needed to fill the containers if one chooses to do so.
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