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When freezing temperatures threaten, we can take steps to insulate plants against the cold. For brief freezes, you can simply cover plants with blankets, towels, burlap, or other insulating materials.
But when plants are in a container, the cold exposure is coming from all around–the air above, on all sides, and in some cases such as on a deck or balcony, also from below).
Parisian market gardens in the 1800s used 18-inch diameter bell-shaped glass jars (cloches) to protect plants in cold weather. They were used to protect everything from young seedlings to mature plants. Notched wooden sticks were used to prop up and vent the jars on sunny days, and were placed back down on the soil before nightfall. [2]
Protect tender plants from the cold, NWS advises, and wrap and drain any outdoor water pipes to prevent freezes or leave them on a slow drip. ... Purdue recommends growers use floating covers to ...
For taller plants grown in rows or blocks, heavy-duty fleece can be used to fashion a form of "cloche", i.e. a small tent structure. When used as a protection against the wind the fleece is wrapped around, or covered over the delicate plants to protect them from frost and cold wind.
Row covers can reduce the drying effect of wind, and can provide a small amount of warming in a similar way to unheated cold frames, greenhouses and polytunnels, creating a microclimate for the plants. The first commercial-scale use of polyethylene row covers in the US was in the 1950s, and by the 1980s their use was widespread. [1]
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