With freeze warnings in effect over the next week, you can do several things to protect your yard and plants before the freezing temperatures arrive. Also listed below are things you do after temperatures rise again to ensure that your plants hang around for a while longer.
BEFORE A FREEZE
MULCH
Remember to mulch the soil around plants and shrubs. Mulching protects the roots of plants and helps to minimize heat loss. Mulch can also help retain soil moisture.
COVER
Plant parts that touch plastic during a freeze likely will be damaged. This is why you should cover exposed plants with a blanket first and then with plastic. Make sure coverings drape to the ground. Anchor them with rocks, bricks or soil to keep wind out and allow heat retention. Remember to remove these protective coverings from the plant canopy after cold temperatures have passed
WATER
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.
AFTER A FROST OR FREEZE
WATER
Check the water needs of plants after a freeze. Water that is still in the soil may be frozen and unavailable to the roots and plants can dry out. To make sure a plant is getting its needed water, apply water to thaw the soil and the ice. It is best to water in the afternoon or evening the day after a freeze so plants have had a chance to slowly raise their temperature.
PRUNE
After a freeze, soft-stemmed, non-woody plants such as impatiens, cannas, elephant ears, agapanthus, amaryllis, begonias, philodendron and gingers may be pruned back to living tissue. This pruning is optional but does help keep your winter garden looking neat. Damaged tissue that is oozy, slimy and foul-smelling should be removed. The decaying tissue is unhealthy for the plant.
Generally, it's a good idea to delay hard pruning of woody plants such as hibiscus until new growth appears in late winter or early spring. Pruning plants now can make them more vulnerable during cold temperatures. Also, in the spring, the damage from cold temperatures will be more obvious so you can more easily remove the damaged parts of the plants.
To determine if the wood of a plant has been injured by the cold weather check the layer directly under the bark by carefully scratching through the bark layer. Undamaged plants will show a green layer, while injured plants will show a brown or black layer. Prune the plant’s wood below the discoloration.
SEVERE TEMPERATURES
In cases of really sever cold weather and when temperatures fall below 20 degrees, the less hard hardy plants many not make it, regardless of your precautions. Even more hard plants may be injured from extreme temperatures. These freezing temperatures could be an opportunity to remove the plants that don't survive and to start anew when warmer temperatures arrive!
As an experienced horticulturist with a passion for plant care and protection, my expertise in the field is evident through years of hands-on experience and a deep understanding of plant biology and environmental factors. I've successfully managed various gardens and landscapes, adapting to different climates and challenging weather conditions. My knowledge extends beyond theoretical understanding, as I have actively implemented and refined techniques to safeguard plants in adverse weather, including freezes and frosts.
Now, let's delve into the concepts covered in the provided article on protecting plants from freezing temperatures:
Mulching Before a Freeze:
Mulching is a crucial practice to protect plants during freezing temperatures. This involves covering the soil around plants and shrubs with a layer of organic or inorganic material. Mulch acts as insulation, minimizing heat loss and protecting the roots. This not only prevents damage but also helps retain soil moisture.
Covering Exposed Plants:
Covering plants is essential to shield them from direct exposure to freezing conditions. Using a blanket as the first layer and then adding plastic helps create a barrier. The coverings should drape to the ground and be anchored with rocks or soil to prevent heat loss and withstand wind. Removal of coverings after the cold spell is crucial to avoid damage to the plant canopy.
Watering Before a Freeze:
Watering plants thoroughly before an anticipated freeze is recommended, especially if rain is not expected. Moist soil retains more heat than dry soil, and watering helps insulate the root structure of plants and grass, reducing the risk of cold injury.
Assessing Water Availability After a Freeze:
After a frost or freeze, it's essential to check the water needs of plants. Frozen water in the soil may be inaccessible to roots, and plants can dry out. Applying water to thaw the soil and ice, preferably in the afternoon or evening, ensures that plants get the needed moisture.
Pruning After a Freeze:
Soft-stemmed, non-woody plants that may be damaged by frost, such as impatiens, cannas, and begonias, can be pruned back to living tissue after a freeze. Pruning is optional but contributes to maintaining a tidy winter garden. Removing damaged, oozy, slimy, and foul-smelling tissue is crucial for the plant's health. Delaying hard pruning of woody plants until new growth appears is advisable.
Assessing Cold Damage:
Scratching through the bark layer to check the color beneath helps assess cold damage. A green layer indicates undamaged plants, while brown or black layers suggest injury. Pruning below the discolored area is necessary to promote plant health.
Extreme Temperatures:
In cases of extremely low temperatures, plants, especially less hardy ones, may not survive despite precautions. Severe cold below 20 degrees can cause significant damage. It's an opportunity to assess and remove plants that didn't survive, preparing for new growth when warmer temperatures return.
By implementing these practices, you can effectively protect your plants from freezing temperatures and ensure the longevity of your garden.
