Living in the desert southwest, I am blessed to be able to grow a variety of citrus trees in my garden and they do very well under most circumstances.
However, when temperatures outside of the average highs and lows occur, steps need to be taken to protect them. With this week’s record-breaking highs, my orange tree has been suffering as is evident from its sunburned leaves. So I thought, this is a great opportunity to talk about how to protect citrus trees from a heatwave.
1. Provide temporary shade
The west and south-facing sides of citrus trees are susceptible to sunburn during a heatwave. This shows up as yellowing or browning on the leaves on those sides of the tree. Sunburn can also occur on immature citrus fruit, so it’s important to protect them.
While spraying citrus trees with sunscreen isn’t an option, adding temporary shade is. Put a large piece of burlap over the tree, focusing on those south and west-facing exposures. Burlap is inexpensive and does allow some sun to penetrate, which is important. You can purchase burlap at your big box store, nursery, or Amazon (affiliate link below).
You can use a bed sheet in place of burlap for temporary shade. Another option would be to place a shade tent/canopy to help block the sun’s westerly rays.
Shade cloth is very useful as a sun shield when placed on a scaffold or other support – it’s important not to rest it directly on the tree as it gets hot and can burn the leaves.
2. Increase irrigation and water early in the morning
When temperatures soar above normal, citrus trees, like most plants, lose more water through their leaves. As a result, their regular watering schedule isn’t enough to meet their needs, so increase the frequency of watering as long as the heat wave lasts.
When you water is vital as it is difficult for plants to uptake water in the middle of the day. This is because all of their resources are dedicated to enduring the stresses of the heat and it’s hard for them to divert those to uptake water. Water in the early morning, which will allow them to build up a water reserve that will help them through the day.
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Once the heat wave is over, remove the temporary shade and resume regular watering. By implementing these two methods, you’ll enable your citrus trees to weather brutal summer temperatures and minimize any negative effects.
*Sun protection for the trunk and bark of citrus trees is essential throughout the entire year. Here is a past blog post showing you how to shield these parts of your tree and why it is so important.