Plant SOS · Plant Profile
Cacti and Succulents:
The Complete Guide to Proper Care
Cacti and succulent plants share a common characteristic that explains almost their entire lifestyle: their ability to store water in their stems, thick leaves, or fleshy pads, inherited from their adaptation to arid climates. It is this internal reserve that makes them so tolerant to neglect and so vulnerable to the opposite excess: too much attention, in the form of overly frequent watering, remains the number one cause of their demise indoors.
Graphic forms, sculptural silhouettes, and sometimes surprising blooms in certain succulents: this plant family brings a mineral and contemporary style to any interior, with maintenance that remains among the simplest once the right habits are acquired.
Identity Card
Ideal Light
Full sun, rarely a problem
Unlike most indoor plants, cacti and most succulents enjoy bright light and tolerate direct sun well, especially on a south-facing windowsill. A lack of light quickly results in etiolation: the plant stretches and deforms in search of a stronger light source.
Watering: The soak and dry method
Complete watering followed by total drying
The most reliable method is to water generously until water drains from the drainage hole, then let the substrate dry completely before the next watering — typically 2 to 3 weeks in summer, and 4 to 8 weeks in winter depending on the variety and ambient temperature.
"A cactus almost never dies of thirst.
It much more often dies from too much attention."
Substrate and drainage
The most important point of all maintenance
A special cactus and succulent potting mix, or a universal potting mix lightened with 30 to 50% coarse sand, pozzolana, or perlite, is essential to prevent water from stagnating around the roots. A pot with a drainage hole is equally essential: without it, even perfectly dosed watering can cause root rot.
Fertilization
A light input, rarely essential
Fertilize every 4 to 6 weeks during the active growing period, at a reduced dose compared to classic green plants. Many cacti and succulents thrive very well without any fertilizer, as their naturally slow growth requires few additional nutrients.
Routine care and repotting
Handle with gloves for thorny species
Repotting is done every 2 to 3 years, more out of necessity (pot too small) than fixed schedule, preferably in spring. For thorny cacti, thick gloves or a folded newspaper strip greatly facilitate handling without risk of prickling.
Our Cactus & Succulent Collection
Species selected for their shape and ease of care, ideal for creating your mineral corner.
Common Problems
These plants generally remain very robust, but certain signs deserve your attention:
| Symptom | Probable Cause |
|---|---|
| Soft, translucent base | Overwatering, onset of rot |
| Etiolation (plant stretches) | Lack of light |
| Shrinking, wrinkles on stems | Prolonged lack of water (less serious than excess) |
| White cottony spots | Mealybugs |
| Discoloration, reddish or yellow tint | Too much direct sun for some sensitive succulents |
For a more precise diagnosis in case of pests, consult our guide I see insects on my plant.
Mistakes to Avoid
- ❌ Watering on a fixed schedule instead of checking that the substrate is completely dry
- ❌ Using an unlightened universal potting mix, which retains too much moisture
- ❌ Choosing a pot without a drainage hole, "just for aesthetics"
- ❌ Placing a species that loves full sun in a dark corner hoping it will adapt
- ❌ Panicking and overwatering at the first signs of softening, which almost always worsens the situation
Frequently Asked Questions
Short answers to the questions we are asked most often about cacti and succulents.
How often should I water a cactus?
Generally every 2 to 3 weeks in summer, and every 4 to 8 weeks in winter. The most reliable method is to check that the substrate is completely dry before watering again.
Why is my cactus getting soft at the base?
This is almost always a sign of rot due to overwatering. Check the pot's drainage and significantly space out waterings, or even stop completely until the plant recovers.
Why is my cactus stretching abnormally?
This is a lack of light (etiolation). Move it closer to a brighter light source, ideally a spot in full direct sun for most species.
Can you keep a cactus in a pot without a drainage hole?
It is not recommended. Without a drainage hole, water inevitably stagnates at the bottom, even with measured watering, which greatly increases the risk of root rot.
Should I fertilize a cactus?
It is not essential, but a light application from March to September can support the growth and flowering of certain species. Always reduce the dose compared to classic green plants.
How to get rid of mealybugs?
A cotton swab soaked in 70° alcohol applied directly to the white cottony spots can eliminate them one by one. Repeat the operation weekly until they are completely gone.
Are cacti and succulents toxic to animals?
Most are not toxic if ingested, but thorns can injure a curious animal. It is best to place them out of direct reach of paws and snout.
In summary
- ✅ Bright light, often in full direct sun
- ✅ Water rarely but generously, allowing to dry completely between waterings
- ✅ Very draining substrate (sand, pozzolana, or perlite) and pot with drainage hole
- ✅ Light fertilizer from March to September, not essential
- ✅ Repot every 2 to 3 years, with caution for thorny species
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We write practical guides to help enthusiasts care for their indoor plants. · sosplantes@douceurmaison.fr
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