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How to hang a wreath on a storm door
Buy a suction cup hook with a sufficient weight rating.
Clear, flexible suction cups with metal hooks attached are easy to find online or at many home goods retailers. Before buying, though, check the packaging for a maximum recommended hanging weight.
If you have a very lightweight wreath-one made primarily of plastic or fabric, for instance-any decent suction cup hook will probably do. For bigger wreaths, though, weigh them before suction cup shopping.