To shield your plants from frost, cover them with burlap, cheesecloth, sheets, blankets, towels, or even several layers of newspaper. Cover them before nightfall to trap warmer air around the plants.
Frost Cloths or Blankets: Use frost cloths, old sheets, or blankets to cover your plants. Make sure to secure the covers to the ground to keep warmth in and protect against wind. Row Covers: These lightweight covers allow light and moisture in while providing insulation.
Ordinary trash bags are too thin and fragile to use in the garden. UV light and weather decays them really fast. Get some 4ml or 6ml black landscaping plastic at Home Depot, or else use contractor grade trash bags.
Don't use plastic sheets or bags draped over the plant in a way that contacts the leaves! Plastic traps condensation which can freeze, which will damage any parts of the plant it is touching. Fabric is a better choice because it will let moisture out while holding onto some heat from the earth.
A moderate frost, with temperatures ranging from about 28°F to 32°F, necessitates a bit more precaution. In addition to tucking your plants in well with some frost cloth or cover, it's also a good idea to water your plants the evening before frost is expected to hit.
Place cardboard boxes, large trash cans, or plastic tubs over outdoor plants. Be sure to cover the plants all the way to the ground. The warmth from the soil is what keeps the plant warm, since the soil takes longer to freeze.
Properly applied frost cloth can protect your frost sensitive plants from the cold even when the temps dip into the 20s! If necessary, the frost cloth can be left on the plants for an extended period of time without the risk of harming your plants.
Fabric coverings will prevent the freezing air from coming into direct contact with the moisture on the plant while also capturing the heat that is radiating from the ground. Bed sheets or comforters work best for covering large plants and shrubs.
Plastic tarps will transmit cold air to the plants, causing more harm than good. Use cotton blankets or frost cloths for better protection.
Covering Plants with Plastic Bags
Plants under plastic bags retain moisture and even capture what the plants produce by transpiration. Don't use plastic bags as a greenhouse for succulents, though, as they can definitely tolerate neglect, but won't tolerate this kind of moisture.
Frost Protection
Cover your plants with a poly tarp on frosty nights to keep them from freezing. Be sure to remove the tarp once the temperature rises to prevent overheating.
If it is not going to rain before the freezing temperatures arrive, you should water plants thoroughly. This is because moist ground stays warmer than dry ground. Watering the night before the freeze arrives will insulate the root structure of the grass and plants, decreasing the potential for cold injury.
Each plant has a different threshold when it comes to dealing with the cold. Some plants can survive outside even when temperatures hit freezing. Others need to be brought indoors when temperatures reach the mid-40s. Be sure you know this before you plant.
What Is The Best Material To Cover Plants From Frost? The best material to use for covering plants is polypropylene fabric. It dries more quickly than other materials, is breathable for plants, and is lightweight enough not to cause any damage to delicate crops or plants.
Wrap pots in burlap, bubble wrap, old blankets or geotextile blankets. It isn't necessary to wrap the entire plant because it's the roots that need shielding. These protective coverings will help to trap heat and keep it at the root zone.
Cover Plants
If plants are not easily moved indoors, then they can be protected with coverings. Potential coverings include sheets, blankets, towels, tarps, frost fabric, or row cover material.
Dark blue, grey, or black tarp colors are the strongest and the heaviest. This is because they often are treated with UV coating. So it helps protect them from any sun damage. In addition, the dark tarps absorb heat better, allowing them to remain calm.
Cover Plants – Protect plants from all but the hardest freeze (28°F for five hours) by covering them with sheets, towels, blankets, cardboard or a tarp. You can also invert baskets, coolers or any container with a solid bottom over plants. Cover plants before dark to trap warmer air.
Store your plants in covered places such as a porch or patio until the weather passes. The warmth of your home will help keep your containers and hanging plants insulated. Consider keeping your big containers on wheels or plant caddies so you can quickly roll the plants to safety.
By covering plants with clear tarps, gardeners can trap warmth around the soil and plant, keeping them shielded from frost. This technique is particularly useful for extending the life of herbs, leafy greens, and other hardy vegetables that thrive in cooler weather but require frost protection.
As an alternative to plastic for frost coverage, Green Impressions recommends fabrics made of natural materials like a cotton or linen towel or blanket, an open burlap bag, or even newspaper.
In fact, you can leave plants covered with blankets or sheets for several days without harming them if freezes are likely for several nights in a row. But eventually the covers must be removed so the plants can get light.
If you don't have frost cloth, cover plants with lightweight cotton sheets or painters cloth that let in air and light. Burlap and blankets, even paper and cardboard will work, but take care not to weigh down the branches. It's best if the cover reaches the ground and can trap the warm air rising from the soil.