When watering the plants to pevent form the harmful effects of frost, the watering must be done during the day and the water should go to the soil, never to the leaves, as they will keep the water and it could get frosted.
Dormant plants do not need to be protected that much as their activity would practically stop during the winter time.
When covering a plant to protect it from frost, plastic would retain some heat but not a large amount, it is better to cover the plants with a fleece.
How to cover a plant with a fleece
Tender plants would need to be protected from frost. To cover them we have to take into account that the soil will absorb heat during the day and give it back during the night time. So the fleece has to be placed over the plant during the night, and taket away during the day.
During the high sun of the winter (2-3 pm) the soil will absorb the most heat, so it's good to have soil iwhtou any cover (fleece or mulch).
During the early morning (5-7 am) it's good to have the soil covered because the soil will loose the heat faster.
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