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The benefits of metalThe benefits of metal containers: strong and non-porous (so it will hold moisture). It's not natural, but we do like the weathered look. The downside: metal conducts heat, exposing roots to rapid temperature fluctuations. This is more of an issue for vegetables than flowers; you can always line the pot with plastic.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?