This allows the plant enough time to absorb the moisture. Sprinkle water around the plant's base before nightfall while the temperature is still above 40 degrees Fahrenheit so that the soil stays moist throughout the freezing night. Plants that are oversaturated with water tend to have shallower root systems that are more susceptible to frost damage. Do not overwater your plants; instead, make sure the soil is evenly moist and damp, but not soaking, to the touch.
Plants that are situated in soil with poor drainage need less water than those in well-draining spots. Avoid sprinkling the foliage of the plant with water before a freezing night.
This can cause frost spots to form on the leaves and damage to the plant. Remember that watering plants is just one step you can take to prevent frost damage. Move container plantings to a sheltered but unheated location, such as on a porch or into a garage or shed. Once frost damage occurs, nothing can be done to reverse the damage. If you find tender plants covered in frost, try spraying them with water to wash the ice crystals away. Letting ice melt in the sun will cause irreversible tissue damage to the plant.
Although it may survive, it will likely have deformed leaves, leaf spots, and uneven growth. All but the hardiest frost-damaged annuals will likely die. There was no expectation that it would be a positive review and we received no compensation for writing it. All opinions expressed here are those of the author based on personal experience using the product. Please note that the Amazon links and only the Amazon links above are affiliate links. Should you choose to purchase products through these links, GPReview will make a small commission at no extra cost to you that helps to support this website and our gardening product reviews.
Thank you! Monica is the founder and Editor of the Gardening Products Review. As long as you keep the ice wet , the ice temperature will stay at 32 degrees F. If the ice dries out and water starts to evaporate from the ice, the ice will get colder than the air temperature as it evaporates. If you understand that you need to keep the ice wet, and when your system will fail to keep the ice wet, you will understand how to use your sprinklers to prevent freeze injury.
The freeze protection from sprinkler systems is limited by the irrigation rate. Most sprinkler systems in Michigan are designed to provide about 0. This volume protects plants to about 22 degrees F with no wind or 24 to 25 degrees F with a light wind. More water is needed to protect at lower temperatures and higher wind speeds see Table 1. Most irrigation systems cannot easily be changed to deliver more water and protect to lower temperatures.
Increasing the operating pressure is not advisable because the volume is not increased substantially you need to increase the pressure four times to double the output.
Higher pressure can break lines and reduces the uniformity of application. Larger nozzles can be installed in some systems, but only if the capacity of the system, mainlines, well and pump can handle the added volume. Irrigation systems are not designed to apply enough volume to protect from temperatures in the low 20s and teens.
Growers should only use sprinklers to protect a crop from freezing, when the temperature range for protecting the crop is relatively narrow, from 24 to 32 degrees F.
This narrow temperature range is the range that we can protect. If the temperature gets a little colder than predicted, we could cause more damage than if we had not turned on the system. Once we turn on the system, we need to keep it on until the temperatures are above freezing or you will cause a lot of damage as the temperature of the ice goes down colder than outside the irrigated area.
It is because of this narrow margin of error that I recommend that growers only try to protect when the temperature range that will cause damage is well inside the range that we can protect to with an irrigation system. Do not use sprinklers if you think they might work.
If it gets colder than you can protect, you will cause more damage, not reduce damage. I would not turn on the system if the temperature were forecast to fall below 24 degrees F. If windy conditions more than 10 mph were forecast, I would not turn on the system at all.
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