Cacti can change color from yellow to brown. This process, known as corking, is most frequently caused by aging. When a cactus reaches maturity, corking occurs spontaneously.
It starts at the plant’s base where the soil is in contact and might gently progress upward or remain stationary. The plant looks woody after corking. The plant is solid to the touch and generally healthy.
You have a distinct problem if the plant becomes brown and feels mushy or soft to the touch. This typically indicates either rotting, sickness, or both. Rot can develop at the roots of a cactus that has been exposed to constant moisture and progress up the plant.
A cactus can also turn brown from diseases like fungus or from pest infestation. The browning frequently affects various plant components, and when touched, it will feel soft and mushy rather than hard.
Can a brown cactus be revived?
Cactus death is typically caused by root rot brought on by over watering and poorly draining potting soils. Between waterings, cacti require the soil surrounding their roots to dry out. The cactus turns yellow, brown, or black with a spongy texture if the soil is persistently moist.
If a cactus receives too much shade, the stem will droop or lean over, but if it is shifted from shade to full sun without first being exposed to more intense light, the cactus will turn white and appear burnt.
When a cactus is living in conditions that are drastically different from those of its natural environment, it will eventually die.
By placing the cactus in at least six hours of direct sunlight, only watering when the soil has completely dried out, and planting or repotting the cactus in specially formulated well-draining gritty succulent and cacti soil to improve drainage so the cactus can recover, you can revive a dying cactus.
What causes the browning of cactus leaves?
A cactus plant may develop a dry form of rot if water in the soil surrounding its base does not evaporate. Over time, some cacti can develop brown dry areas (known as corking) along their columns. When you water, make sure the soil is actually dry. To aid in separating the stem from the wet soil, add stones, pebbles, and coarse sand grains to the soil.
Desert cacti go through a period of inactive growth in the fall and winter, so it’s crucial to modify your care to keep your cactus healthy. Water less frequently and always before noon to allow for complete absorption or evaporation of the water over the day. Water the plant just enough to prevent it from withering, erring on the side of too little water.
Cacti must be grown in a pot with a drain hole and prefer a nutrient-rich, rocky soil with excellent drainage. Too much peat is used in many commercial cactus and potting soil mixtures, which keeps moisture in the soil longer than is ideal. After watering, cactus soil should properly drain in less than a minute. Cacti, like other succulents, require soil to dry out between waterings in order to prevent its tender roots from rotting.
In our guide Cacti Indoors, you may learn more about taking care of your indoor cactus plant.
Should I remove the brown cactus parts?
When a cactus begins to rot, all of the rot needs to be removed in order to save the plant. If it is not entirely eliminated, it will spread and finally kill your cactus. Additionally, cactus rot spreads quickly.
You must move quickly if you don’t want to wind up with a dead cactus plant.
What needs to be done to save your cactus depends on where the decay is occurring. Therefore, I’ll start by demonstrating how to rescue a cactus that is rotting top down.
I’ll then discuss how to salvage a cactus that is rotting from the bottom up in the part that follows.
How To Save A Cactus Rotting Top Down
Cactus tip rot might give false hope. If you see a few little brown spots on a cactus, you can mistake them for minor rot.
Then, as you work to eliminate the troublesome areas, you come to the conclusion that the interior is actually much, much worse than the exterior.
So, before you begin chopping, take a moment to mentally get ready for what you might discover. Ready? Okay, follow these instructions to get rid of cactus stem rot.
Step 1: Select your pruning instrument.
To get rid of the rot, use a sharp knife or pruning shears. I advise using a sharp knife if your cactus is particularly thick.
Otherwise, precision pruners or bonsai shears would be excellent for little plants with thin stems. Just make sure they’re razor sharp to prevent crushing the cactus stem.
Clean your cutting instrument in Step 2—do not omit this step!
Before making any incisions, it is crucial that the equipment you select to use is sterile and thoroughly clean.
It will be easier to stop the spread of illness and fungus spores if you use a clean pruning instrument. You only need to clean your pruning shears or knife with soap and water before drying it off and beginning.
Additionally, I advise cleaning and drying it once more in between each cut. To disinfect it, you might also dip it in rubbing alcohol.
Step 3: Layerarily remove the cactus stem rot
To ensure that all of the rot has been eliminated, it is advisable to trim off the affected areas in stages.
You can see that my cactus plant’s middle, despite appearing to be healthy, nevertheless has interior rot. Consequently, we must continue.
Step 4: Continue stripping away layers until no rot is visible.
The rot will become thinner and thinner as you remove plant layers one by one.
But keep in mind that even a small amount of rot can spread. Therefore, until there are no longer any indications of rot on the plant, be sure to remove all indications of brown, squishy, and mushy cactus material.
Make the final cut on your cactus at an angle if it’s an outdoor plant to prevent water from pooling on top of the wound (which will likely just cause it to rot again).
If at all feasible, I would also relocate the plant to a dry location shielded from the elements until the wound had calloused over.
Unfortunately, before I realized that the top of my plant was going brown, the rot was already rather bad. To completely remove the cactus, I had to cut off more than half of it.
Even though it was challenging for me to cut this cactus in half, I know that if I had left any rot behind, my plant would have died within a few weeks.
Cactus Care Tips After Pruning
If you have to operate on one of your favorite plants, be sure to watch it closely afterward to make sure it doesn’t continue to decay. If it starts to decay once more, eliminate the new rot by following the same instructions as before.
The wound should callus over within a few days, and your cactus will eventually send out new growth close to the cut.
I hated having to chop my cactus in half to get rid of the rot. However, in the end, I believe it gave the plant more personality.
How To Save A Cactus Rotting Bottom Up
Unfortunately, if your cactus is rotting bottom up, or the cactus roots are rotted, then there’s not much you can do to save it.
In this situation, cutting healthy stem sections off and replanting the cuttings is the best course of action.
To ensure that all of the rot is removed from the cuttings, prune your cactus back in layers as instructed in the steps above. Till the cut end has callused over, let the cutting dry for a few days.
Wait to irrigate the soil until the cutting has new growth. Cactus cuttings can take several weeks to root, depending on the kind you have.
What does a cactus that is overwatered look like?
The obvious indicators of an overwatered cactus caused by a fungus in the soil include black or brown blotches and mushy stems. It’s time to carefully chop them off with a knife if you experience any of these bodily symptoms. Use a sterilized knife while handling a rotting plant to prevent the spread of the infection.
You will have to exert more effort if the damage is severe. Essentially, what you’ll be doing is multiplying the portions of your plant that are still alive. Wear nitrile gloves to protect your hands from the cactus’ spines while you chop off the rotting sections, and exercise extreme caution when handling the plant. After cutting out the damaged areas, let your cuttings air dry for a few days, or around a week.
What does a cactus that is dying look like?
Possible dead cactus symptoms include: Cacti topple over or are exceedingly flimsy in the ground. Spikes could come off. These two symptoms point to both root rot and overwatering. Yellow turns brown in color.
How can I revive my dead cactus?
HOW TO SAVE A DIEING CACTUS AND RENEW YOUR PLANT
- REMOVE ROTTING COMPONENTS. Overwatering is typically indicated by rotting.
- CHANGE THE DAILY LIGHT.
- REVERSE WATERING.
- RINSE OFF DUST AND GREEN.
- PEST & INSECT CONTROL.
- FERTILIZE WITH LOW NITROGEN.
- ALLOW THEM TO DRY
- WATCH FOR DISCOLORATION & MUSHY SECTIONS.
How can brown cactus be fixed?
Look to check if the brown spot and the vicinity are mushy and soft. If so, your cactus has probably started to rot from the inside out and is now displaying symptoms on the outside.
After noticing soft brown areas, the best technique to fix your cactus is to cut off healthy stems (without any signs of rot) and start a new plant.
Before cutting, disinfect a razor blade or a pair of extremely sharp sheers. Cut the cactus above the area of rot, allow it to dry, callus over, and then plant it again.
Use fresh soil, and thoroughly clean and dry the pot if you’re using the same one. Unfortunately, there isn’t much you can do to save your cactus as is once it has begun to decay.
In other words, the only method to revive a cactus that has developed rot is to cut off the healthy stems—those portions of the plant that are still green—and repot them in fresh soil.
How can you know if your cactus is on its last legs?
When a cactus looks shriveled and husk-like, it is dead. Additionally, dead cacti can become unstable in their soil and topple over. They could start to smell rancid and becoming mushy, both of which are indicators that they are rotting. Cacti that are dead lose their spines and frequently appear brown.
How come my cactus appears burned?
Cacti plants can turn brown for a variety of causes, as was indicated in our introduction. We go over some of the main causes of this issue in this section.
Root rot
The issue may be root rot if your cactus plant’s base is getting brown and the stem is mushy and yellow.
Root rot can unfortunately be quite difficult to save because it typically starts inside the plant before spreading outside. The majority of the time, root rot symptoms don’t appear until the issue has already progressed.
The best course of action is to stop watering the plant as soon as you discover signs of root rot and repot it in soil that drains effectively.
In order to prevent the rot from spreading, you can also try to rescue your plant by removing all of the rotting tissue and some of the healthy tissue surrounding it.
Use a clean, sharp knife, and clean it between each cut with alcohol. When you’re through, make sure to rub sulfur powder on the wounds to aid in the plant’s recovery. The most frequent causes of root rot are soils with poor drainage and overwatering.
Indoor hazards
The same pests and diseases that threaten outdoor cactus can threaten your interior plants. Indoor plants, however, could experience extra issues that are exclusive to them.
Make careful to ensure that your indoor plants are not adjacent to a heat vent if they begin to exhibit indications of browning or drying out.
Despite the plant’s thick layer of waxy protection, the hot stream of air that the vent blows can cause the tissues to dry out. Similar harm can also be done by AC vents, albeit it might take longer for the harm to manifest.
Usually, if your plant is not directly in a window and starts to turn brown and feel brittle on one side, it is time to think about relocating it to another location.
Sunburn
The most frequent and likely reason for your cactus plant to start turning brown from the top is sunburn. Given that the majority of us have a misconception that cactus are sun-loving desert plants, this may sound strange.
Not all cacti species, meanwhile, do well in the intense sunlight. Some of them need only a little sun and some shade to grow successfully. If you don’t give your new cacti plants from the store or nursery enough time to adjust to the harsh outdoor light, they could also get sunburned.
Mild sunburn typically manifests as a pale discoloration on the plant’s sun-facing side. The whitish areas eventually transform into brown scars, which are a sign of severe sunburn. There is nothing you can do to repair severe brown burns on cacti plants because they have been permanently damaged.
Moving your plant to a shaded area, however, will rescue it if it has white patches. It will totally recover if you give it shade on the warmest days of the year. It would also be beneficial if you spend some time learning about the lighting requirements of your plant so that you can create the ideal environment.
Remember that species of cacti that aren’t used to being in direct sunlight need to acclimate by being exposed to full sunlight for a brief period of time every day.
Start gradually increasing the exposure over several weeks. Your plants will quickly become accustomed to the outdoor lighting settings.
It’s also important to note that some cacti plants shouldn’t be left in direct sunlight all day.
Scales
Scales are tiny insects with hard, brown shell coverings that frequently resemble brown patches on cacti plants. These insects consume plant liquids, weakening the cactus plant and turning it brown or yellow.
If this is the case, you might want to wash your plant with a reasonably light detergent solution or consider spraying it with a stream of water to remove the scales. For extensive infestations, you can use your chosen brand of insecticide.
Using cotton swabs that have been dipped in horticultural oil and applied to both sides will also kill scales. As a result, an oil coating builds on top of the scales, blocking off the insects’ access to oxygen.
Frost damage
Similar to sunburns, cacti plants may become brown where they have been damaged by cold. The only way to distinguish between frost damage and sunburn damage is by checking the temperature because the damage is pretty similar.
Cactus plant tissues that are exposed to cold temperatures experience cell rupture. Even though you might not detect the damage right away, the plant will attempt to self-heal by covering the harmed tissues with calluses.
Although the brittle patches on the plant are typically spotty, this type of self-healing mechanism also takes place after a hailstorm.
Indoor plants that come into direct touch with the window glass might nevertheless sustain frost damage.
Mites
A mite infestation may be evident if your plant is becoming brown from the top, where new growth is beginning to form.
Red spider mites are small insects that feed on the liquids your plant produces in its more delicate areas. Because these insects are so tiny, finding their webs may be easier than finding the insects themselves.
Rusty brown stains that emerge on the plant’s top and the appearance of mite webs are signs of a mite infestation.
These pests can destroy your plant if they are not dealt with since they feed entirely on the tissue of the outer layer. Red spider mites are most likely to infest indoor cactus.
The plants may occasionally leave the nursery with these mite infestations already present. Consider watering your plant from above with a reasonably strong stream of water to get rid of bugs.
Another typical sort of mite that could infest your cactus is root lice. For plants produced in greenhouses, root lice can travel from pot to pot, making control difficult.
Root lice are best treated by keeping your new plants separate from the other plants for a few weeks. To control root lice, you should also refrain from recycling and sharing soil.
Corking
A cactus plant that is otherwise healthy may suddenly develop stiff, brown tissue that resembles bark a few inches above the earth. This is an indication of corking.
Fortunately, this is a normal aspect of cacti plants’ aging processes, so you shouldn’t be too concerned.
Most of the time, corking begins at the plant’s base and progresses upward. There is nothing you can do to stop the natural process of corking if your plant is browning as a result.