- 1). Keep a sharp eye on weather reports and an outdoor thermometer when a frost or freeze is predicted. When the temperature drops to about 35 degrees F, it's time to take action. If temperatures drop below 30 degrees, it's too late.
- 2). Screw the end of a garden hose to an outdoor faucet. Attach a sprinkler to the other end. If your citrus trees is more than 6 feet tall, set the sprinkler on top of a 6-foot stepladder and secure it with rope or plant ties. If it's windy, stake the legs of the ladder with 36-inch plant stakes and ties to keep it from blowing over.
- 3). Turn on the water at the faucet and check to see that the sprinkler's spray is falling on the tree's canopy from above. Make sure the spray is striking all parts of the tree's canopy before going inside for the night.
- 4). Leave the water on through the night and into the next morning, until the outdoor thermometer goes above 37 degrees. If you don't have an outdoor thermometer, turn the water off when ice or frost in the shade nearby has melted.
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