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Your cactus is growing another cactus because of a fascinating natural process called pup formation, offshoots, or basal offsets.
This is completely normal and actually a sign that your cactus is healthy and thriving in its environment.
When you see a cactus growing another cactus, it’s essentially the parent plant producing a clone of itself, a baby cactus that shares the exact same genetics.
In this post, we’ll explore exactly why is my cactus growing another cactus, the different reasons behind this growth, how to care for the baby pups, and when you should consider removing them.
Let’s dig into the wonderful world of cactus propagation and understand this adorable phenomenon.
Why Is My Cactus Growing Another Cactus?
The short answer is that your cactus is growing another cactus as a survival and reproduction strategy, and it’s one of the most common ways cacti propagate in the wild and at home.
1. Natural Reproduction Through Offsets
Many cactus species, like the popular Echinopsis, Mammillaria, and Gymnocalycium, naturally produce offsets or pups as a means of asexual reproduction.
These baby cacti grow from the base or sides of the parent plant, forming a cluster over time that resembles a small family.
When your cactus is growing another cactus, the parent is essentially ensuring its genetic line continues even if the main stem gets damaged or dies.
This is why you’ll often see wild cacti growing in dense mounds, each plant connected underground or tightly packed from repeated pup production.
2. Response to Stress or Damage
Sometimes your cactus is growing another cactus as a direct response to environmental stress or physical injury.
If the main stem suffers frost damage, sunburn, or gets accidentally knocked, the cactus may sprout pups as a way to regenerate and survive.
This is a survival mechanism where the plant prioritizes creating new healthy clones over repairing the damaged original tissue.
You might notice pups appearing near the wound site or at the base after a stressful event, which is the cactus’s way of hedging its bets.
3. Hormonal Signals and Growth Patterns
Cacti produce hormones like auxin and cytokinin that regulate where and when pups appear.
When the apical meristem, the growing tip of the cactus, is healthy, it suppresses pup formation through a process called apical dominance.
However, if the growing tip is damaged, removed, or simply reaches its mature size, hormonal signals shift and encourage the cactus to start growing another cactus from dormant buds.
This is why you might see a cactus growing another cactus at the top after you cut off the crown, or at the base when the plant gets too tall and top-heavy.
4. Overcrowded Pot or Root Bound Conditions
If your cactus has been in the same pot for years and has become root bound, it may start producing pups as a natural response to limited space.
This is your cactus’s way of trying to expand its territory and create more plants that can eventually find their own space.
When your cactus is growing another cactus in a cramped pot, it’s a clear signal that the plant is ready for a larger container or that you should consider separating the pups.
5. Optimal Growing Conditions
Your cactus is growing another cactus most readily when it’s receiving the perfect balance of sunlight, water, and nutrients.
Healthy, vigorous cacti have excess energy reserves that they can channel into producing offsets.
If you’ve recently changed your care routine, moved your cactus to a sunnier window, or started fertilizing, you might notice a sudden burst of pup growth.
This is the plant telling you it’s happy and thriving, so keep up the good work!
What Should You Do When Your Cactus Is Growing Another Cactus?
When you notice a cactus growing another cactus, you have a few options depending on your goals for the plant.
1. Leave the Pups to Form a Cluster
Many cactus lovers choose to leave the pups attached to create a beautiful, clumping display over time.
This is especially attractive for species that naturally grow in mounds, like Mammillaria or Rebutia, where the cluster becomes the main aesthetic feature.
Leaving the pups attached also keeps the parent plant more stable and can reduce the risk of rot if the cluster stays compact.
2. Remove and Propagate the Pups
If you want more individual cactus plants, you can remove the pups when they reach about one-third to one-half the size of the parent plant.
Gently twist or cut the pup away with a clean, sterilized knife, making sure to remove it with a small piece of root tissue if possible.
Allow the cut area to callus over for a few days before planting it in a well-draining cactus mix.
This is a rewarding way to expand your collection or share your cactus with friends and family.
3. Repot to Give Everything More Room
If your cactus is growing another cactus and the pot is getting crowded, it’s time to repot the whole cluster into a slightly larger container.
Choose a pot that’s only about 1-2 inches wider than the current one to avoid holding excess moisture in the soil.
Repotting during the active growing season in spring or early summer gives the cactus the best chance to recover and continue producing healthy pups.
Common Mistakes to Avoid With Cactus Pups
When dealing with a cactus growing another cactus, there are a few pitfalls you’ll want to sidestep to keep both plants healthy.
1. Removing Pups Too Early
Pups that are too small may not have enough stored energy to survive on their own after separation.
Wait until the pup is at least a few centimeters in diameter and shows its own root system before attempting removal.
2. Overwatering After Separation
Newly separated cactus pups are vulnerable to rot, so it’s crucial to let them dry out and callus before planting.
After planting, wait at least a week before watering to allow any small wounds to heal and roots to settle in.
3. Ignoring Light Needs
Pups that grow in the shade of the parent plant may be etiolated, meaning they stretch and become weak.
Ensure your cactus is growing another cactus in a location that receives bright, indirect light, and gradually acclimate new pups to stronger sunlight after separating them.
So, Why Is My Cactus Growing Another Cactus?
Your cactus is growing another cactus because it’s a natural, healthy reproductive strategy that ensures the plant’s survival.
Whether it’s responding to stress, celebrating ideal conditions, or simply following its genetic blueprint, pup production is a sign of a thriving plant.
You can either enjoy the cluster as it forms or carefully remove and propagate the pups to grow your own cactus family.
Just remember to give the pups time to mature, avoid overwatering, and provide plenty of bright light for the best results.
So the next time you notice a cactus growing another cactus, smile and know that your plant is doing exactly what it’s designed to do.