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Cacti are known for living in hot and arid environments, but can it be too hot and sunny for a cactus? What can I do to heal a cactus that has been burned?
Even hardy cacti can suffer from sunburn, especially if they are suddenly exposed to intense sunlight after being in a shaded or indoor environment. The symptoms of sunburn in cacti can include discoloration, usually appearing as brown, yellow, or white patches on the cactus’s surface.
Cacti may also experience heat stress, which can lead to wilting, drooping, or discoloration, and this may occur in conjunction with sunburn.
Interestingly, some gardeners encourage mild heat or sun stress in specific types of cacti to bring out unique coloration. I consider this to be an overexposure to sun, but not to the point of causing the damage that a sunburn would do.
For example, we have some plants that have been exposed to lots of sunlight, much more than is usually recommended for them. This overexposure has added a striking reddish color to their leaves, but they remain healthy and attractive. They were stressed just to the point where their leaves turned red, but not to the point of getting sunburned.
These plants have been mildly stressed, just enough to enhance their appearance without causing any harm. This color shift adds a unique and appealing coloration.
They were gradually hardened and exposed to the sun slowly to achieve this look.
If you were to quickly move a plant to full sun exposure without hardening it first, it would not have this appearance but would get burned instead, causing damage to the leaves, or the whole plant.
I like the way these plants look with a touch of red in their leaves, but even so, we need to move them to a shadier area to prevent further stress and potentially getting sunburned.
These plants are still healthy and are very attractive with their sun-enhanced appearance, but that may not always happen when your cacti get too much sun.
An actual sunburn will damage leaves and can leave unsightly scarring or kill your plant.
How Can I Protect My Cactus From Sunburn?
If you’re moving a cactus from indoors to outdoors or from shade to sun, do it gradually. Start with a few hours of morning sun, increasing exposure slowly over several weeks.
Some cacti can tolerate more sunlight than others, so learning about your cactus can help you know exactly how much sun is too much.
You might also consider using a shade cloth or lightweight coverings to provide a bit of shade for protection during especially hot days.
You can easily find shades for your plant at Amazon here. Some of them cover just the individual plant, others can cover a wider area or multiple plants. There are even shades that are like greenhouses, or tunnels that you can use for more than just your cacti.
How Do I Fix My Sunburnt Cactus?
The first thing you should do to fix your sunburned cactus is to move it out of the sun to a shaded area to protect it from further exposure.
Cacti need less water than many other plants, but if they’re in full sun without enough moisture, they can get dehydrated. This dehydration can also make them more susceptible to sunburn as well.
After you have moved the cactus to a shaded area, ensure that the soil is well-draining because you then need to water your plant sparingly and you don’t want it to develop root rot. Don’t water it too much.
Wait until the soil is almost completely dry before watering it again as cacti are vulnerable to overwatering, especially when stressed.
Cacti heal slowly, so you may have to be patient. It will take time for it to heal if the damage is not too great.
Once the cactus shows signs of recovery, gradually reintroduce it to adequate sunlight…just enough to support its growth without overexposure.
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