Having healthy plants is not a matter of luckbut rather to understand what they need and, above all, what things are harming them without you realizing it. We often think we're bad with plants, when in reality we're repeating a series of very common mistakes that end up weakening them until they die. If you need a practical introduction, consult gardening guide for beginners to get off to a good start.
The good news is that almost all of those flaws can be corrected. With a little information and observation, you can learn to avoid common mistakes in gardening and the care of indoor and outdoor plants. In this article, you'll discover why these mistakes are so harmful and what you can do starting today to prevent them by using environmentally friendly techniques and organic products when necessary. For more specific examples, also check out the... most common mistakes in gardening.
1. Watering: the classic excess (or total lack of water)
Irrigation is largely responsible for most "planticides"It is estimated that a very high percentage of plants die from overwatering rather than drought, both in pots and in the garden. Watering "out of routine" (on Mondays and Thursdays, for example) without checking the soil is a recipe for disaster. If you're worried about watering in summer, read on. Mistakes when watering in summer and how to fix them.
When there is too much water, the roots are deprived of oxygen.They suffocate and begin to rot. You'll notice this in constantly soggy soil, a bad smell, yellowing leaves that fall off easily, and soft stems. At the other extreme, if you forget to water or go on a trip and no one takes care of it, the soil can dry out so much that it repels water, and the plant completely dehydrates. Understanding the importance of irrigation It will help you adjust the frequency.
To avoid this, the first step is to observe the soil before touching the watering can.Insert a finger or a wooden stick 2-3 cm deep: if it comes out with soil clinging to it, there's still moisture; if it comes out clean and dry, then it's time to water. You can also use moisture meters or smart devices that tell you when your plant needs water, light, or fertilizer; check out our essential gardening kit for ideas of useful tools.
Another vital key is drainageThe pots must have enough drainage holes in the bottom to allow excess water to escape. If you use a decorative pot without holes, place a plastic pot with drainage holes inside and empty any accumulated water from the outside after watering. In cases of extreme drought in the potting mix, immersion watering (submerging the pot in a basin of water until the soil is thoroughly soaked) is much more effective than pouring water from above. The problem with insufficient drainage It is usually detected by yellow leaves and rotten roots.
It also adapts the watering frequency to the type of plant and the climate.Some species need consistently slightly moist soil (frequent or abundant watering), while others prefer the substrate to dry out between waterings (moderate watering). As a general guideline:
- abundant watering: every 1-2 days, thoroughly soaking the substrate, but with very good drainage.
- Regular watering: about 2-3 times a week, allowing the surface layer to dry slightly.
- Moderate wateringEvery 7-10 days, ideal for succulents and plants sensitive to excess water.
2. Inadequate light: neither plants in the cave nor in the scorching sun
Light is the “fuel” of photosynthesisPlacing plants in the wrong location causes them to weaken gradually. One of the most common mistakes is thinking that "shade plant" means it can live almost in complete darkness, far from any window. The opposite is also true: placing a delicate plant right up against a south-facing window in the middle of summer and letting the sun scorch it.
Lack of light causes pale leaves and elongated, weak stems. that stretch towards the window, leaf drop, and lack of new growth. Excessive direct sunlight, on the other hand, produces brown or dark spots similar to burns, dry edges, and crispy leaves.
The solution lies in understanding the light requirements of each species.Many houseplants prefer bright, indirect light (near a curtained window, or with gentle early morning sun). Others, like certain succulents, can tolerate direct sunlight if gradually acclimated. If your home is dark, you can supplement the light with... grow lights so that they do not live in total darkness.
When a plant has already found a place where it looks comfortable (If it grows, produces new leaves, maintains its color, and shows no signs of stress), it's best not to move it constantly for aesthetic reasons. Repeated changes of location cause extra stress because they force the plant to adapt to new light and temperature conditions over and over again.
Before placing a plant, carefully consider the orientation, light intensity, and air currents.A good initial choice will save you a lot of trouble later, and your plants will quickly "tell" you whether they like that corner or not through their overall appearance.
3. Pots without drainage and unsuitable substrates
Roots need air as much as waterUsing pots without drainage holes or with minimal drainage is a very common mistake: water accumulates at the bottom, the potting mix becomes waterlogged, and the roots eventually rot. Sometimes we buy a beautiful decorative pot, but one that's not very practical for the plant's actual needs. The practical solution involves... use pots with drainage holes or a good pot cover with drainage material.
The type of substrate is another key point that is often overlooked.Not all plants grow well in a cheap, compacted "universal" potting mix. Some require very well-draining soil (cacti, succulents), others prefer mixes rich in organic matter with good moisture retention, and still others need acidic or slightly alkaline pH.
Choosing specific, high-quality substrates greatly improves the health of the plant.You can customize the mixes by adding perlite, sand, peat moss, coconut fiber, or other materials that improve aeration and drainage, depending on the plant species. For example, a rich, airy substrate that doesn't compact with watering works very well for many houseplants.
In addition, the size of the pot should accommodate the growth of the roots.When you see roots growing out of the drainage holes, the plant seems to be "bursting" out of the pot, or it has stopped growing, it's time to repot. Transfer it to a pot only slightly larger, refresh the potting mix, and gently loosen the roots so they can expand again. If you're working with seedlings, check how to keep them in perfect condition.
4. Lack of nutrients… or fertilizing haphazardly
Water and light aren't everything: plants also need to eatIn pots, the nutrients in the substrate are depleted relatively quickly, especially if the plant is growing well. Never fertilizing usually results in small leaves, lack of vigor, poor growth, and weak flowering.
But the opposite extreme, overloading the plant with fertilizer, is also dangerousToo much fertilizer can "burn" the roots, cause brown edges on the leaves, general weakening, and in severe cases, the death of the plant. Furthermore, it's not a good idea to fertilize when the plant is clearly sick or very stressed: the first step is to stabilize watering, light, and overall condition, and then, once it has recovered, resume fertilizing.
The most sensible thing to do is to use specific fertilizers and always respect the indicated doses. by the manufacturer. For most ornamental plants, the peak fertilization period is spring and summer, every 7-15 days if you use liquid fertilizers diluted in the irrigation water. Reduce the frequency in autumn, and in winter, when many species go dormant, it's best to almost or completely stop fertilizing. Whenever possible, opt for ecological fertilizers and zero waste products.
If you suspect you've overdone it with the fertilizerStop fertilizing for at least a month, water properly (sometimes more abundant watering is advisable to wash away accumulated salts) and observe how the plant responds before applying the product again.
5. Pests and diseases: the problem of looking the other way
Pests rarely appear overnight in an advanced stageThey usually give warning signs: small spots on the undersides of leaves, sticky honeydew, fine cobwebs, strange spots, or discolored areas. The big mistake is not checking the plants regularly and letting the problem become an infestation.
Aphids, whiteflies, thrips, mealybugs, or spider mites are common visitors Both indoors and outdoors. Fungal diseases such as powdery mildew, downy mildew, or botrytis spread rapidly if they find constantly damp leaves, poor ventilation, and accumulated organic debris on the substrate.
To prevent this, hygiene is key.Remove dead leaves, avoid excess humidity by placing pots close together if necessary, clean dust and dirt from the leaves, and ensure good air circulation. Checking the undersides of leaves every few days, especially during warmer months, allows you to react quickly.
When you detect a pest, act quickly and judiciously.You can manually remove the most affected parts, take healthy cuttings to save the plant in case of a severe infestation, and apply insecticide or fungicide treatments. Ideally, opt for organic products, such as neem oil or leaf cleaners, which, in addition to keeping the surface clean, strengthen the plant and make it harder for pests to take hold.
Remember that a well-nourished plant in a suitable environment is much more resilient to any attack. Just as in human health, prevention and good general health are as important as, or even more important than, timely treatment once the problem has already erupted.
6. Poorly done or non-existent pruning
Pruning is not an aesthetic whim, but a tool for plant health.In shrubs, climbing plants, and many houseplants, trimming old or poorly oriented branches helps light reach the interior, renews foliage, and stimulates new growth.
One of the most frequent mistakes is pruning at the wrong timeFor example, cutting back too quickly just before flowering or in the middle of winter in sensitive species. Another common mistake is making poorly positioned cuts, tearing branches with dull tools, or not disinfecting the pruning shears between plants, which facilitates the spread of disease.
The correct way to prune begins with learning about the specific species.You don't prune a rose bush, a hydrangea, a citrus tree, or a houseplant in the same way. Generally, you should prune during periods of active growth or just after flowering, using sharp, clean shears and making clean, slightly angled cuts.
For indoor plants, light pruning and maintenance are often sufficient.Remove dead leaves, trim very long tips that disrupt the shape, or remove weak shoots so the plant can focus its energy on the strongest ones. If you need more specific tips and techniques, check out how to do gardening work.
If you're unsure or if they are valuable specimens (large trees, formal hedges, community gardens), you can always turn to professional gardeners who will take care of the design, pruning and maintenance with the appropriate technique.
7. Choosing the wrong plants for your climate and your home
Not all plants are suitable for all locationsImpulse-buying a tropical plant for a freezing balcony in winter, or a sun-loving shrub for a perpetually shady patio, usually ends in frustration. The same is true indoors: some plants need plenty of light, others tolerate partial shade better, and not all can withstand the dryness caused by heating or air conditioning.
The climate of your area, the orientation of your house, and the type of soil Soil type (more clayey, more sandy, with better or worse drainage) influences which species will thrive. The amount of time you can dedicate to them also plays a role: some plants are very demanding, while others are practically "all-terrain."
It's always a good idea to do your research before buying.Review cultivation guides, ask at nurseries or professionals, and prioritize native species or those well-adapted to your region. These usually require less special care, less water, and are more resistant to local pests.
If you live with pets, add one more factor to the equation.Not all plants are safe for dogs and cats. Some species are toxic, and their leaves or flowers can cause anything from digestive discomfort to serious problems if ingested. In these cases, choose pet-friendly varieties or keep toxic plants out of reach (which can be difficult with curious cats).
When there is no obvious cause for a plant not thrivingCheck if it's really in the right place in terms of light, temperature, humidity, and substrate type. Adjusting these factors is usually more effective than adding fertilizer haphazardly.
8. Sudden changes in temperature, air conditioning and heating
Plants suffer greatly from sudden temperature changes.Taking an indoor plant outdoors in the middle of summer or winter without acclimatizing it, or placing it directly in front of a draft of cold or hot air, can cause massive leaf drop, yellowing, and stunted growth.
At home, the silent enemy is excessively dry air This is caused by heating in winter or intense air conditioning in summer. Many houseplants are of tropical origin and thrive in high humidity; when the air is too dry, their leaves dehydrate, turn yellow at the tips, and pests such as spider mites may appear.
To protect them, avoid placing them next to radiators, air conditioners, or direct drafts.You can increase humidity by grouping several plants together to create a small microclimate, using humidifiers, placing containers of water nearby, or lightly misting (if the species tolerates it and is not prone to fungus).
If you are going to move an indoor plant outdoors (For example, in spring), do it gradually: first a few hours in the shade, then some filtered light, and so on until they get used to it. Do the same in reverse when they come back inside after summer.
The golden rule is balanceStable temperatures, without extremes, usually result in stronger plants that are less prone to disease.
9. Not cleaning the leaves or taking care of the garden's hygiene
Dust accumulated on leaves is not only unsightlyIt also blocks some of the light, hinders photosynthesis, and worsens transpiration. Over time, the plant weakens, becomes more vulnerable to pests and diseases, and ceases to look vigorous.
A good leaf cleaning routine is essential, especially indoors.Ideally, this should be done at least once a month, adapting the technique to the type of leaf: for large, smooth leaves (monstera, ficus, philodendron, etc.), using a microfiber cloth slightly dampened with warm water works very well. However, for hairy or very delicate leaves, such as calatheas or fittonias, it's best to gently blow on them or use cool air from a hairdryer on a low setting, without wetting or rubbing.
Succulents and cacti require even more careIt's best to use a dry or barely damp brush to remove dust, avoiding wetting the waxy surface that protects them. In all cases, you can use specific leaf cleaners, provided they are mild and, if possible, eco-friendly.
Hygiene also includes keeping the substrate clean.Remove fallen leaves, withered flowers, and organic debris that can rot and encourage fungal growth. In the garden, it's advisable to aerate the soil occasionally and add compost to maintain a healthy, vibrant, and well-drained structure.
Beyond aesthetics, these small cleaning routines have a direct impact on the health of your plants.A plant that breathes and receives good light is a plant with better natural defenses.
10. Constantly moving the plants and not respecting their natural rhythm.
Sometimes we treat plants as if they were decorative objects that we can rearrange at will. every few days. The problem is that each change implies a new microclimate: different light, different temperature, different air circulation.
If a plant shows signs of being comfortable in a place (firm leaves, beautiful color, steady growth), it's best to leave it alone. Moving it unnecessarily can stress it, cause leaf drop, or stunt its growth, especially in more delicate species.
The best strategy is to choose the right site from the beginning.Taking into account the orientation, the light it receives throughout the day, the proximity to windows, the presence of drafts or heat sources and the space available for its growth.
If you still need to move it (Due to renovations, furniture changes, etc.), try to find a place with conditions as similar as possible and give it time to adapt. Don't add other drastic changes (such as an aggressive transplant or heavy fertilization) at the same time to avoid overloading it.
Remember that plants follow their own natural rhythms and appreciate stability. It will help you make decisions that are more respectful of their well-being.
Having a garden or a collection of indoor plants that are a pleasure to look at It doesn't depend on having a "magic green thumb," but rather on knowing and avoiding these common mistakes: routine watering, choosing the wrong light or substrate, neglecting drainage, over- or under-fertilizing, ignoring pests and fungi, pruning indiscriminately, buying plants that aren't suited to your climate or home, subjecting them to sudden temperature changes, and moving them around too often. If you observe, learn about the needs of each species, and opt for organic products and practices, your plants will respond with greater vigor, fewer problems, and a much more spectacular appearance day after day.
