You are aware that indoor plants require water and sunlight, but what about fertiliser? Fertilizing indoor plants during the growing season can provide them the nitrogen (N), phosphorus (P), and potassium (K) they require to thrive (K).
Similar to learning how to repot a plant, feeding your houseplants can seem intimidating at first. However, after you master the fundamentals, you’ll wonder how your plants ever survived without it. The numerous types of fertiliser available, what fertiliser is (hint: it’s not plant food), and how and when to fertilise houseplants are all covered in the sections below.
What is fertilizer?
First and foremost, plants do not eat fertiliser. Photosynthesis is the process through which plants produce their sustenance while utilising sunlight. Fertilizer promotes fresh, healthy growth in a similar manner to a multivitamin. Additionally, it can be utilised to replenish the vital minerals that our plants’ potting soil loses as they mature. The main ingredients, or macronutrients, in fertilisers are nitrogen (N), phosphorus (P), and potassium (K), which we will discuss in more detail later. Fertilizers can also contain a variety of other nutrients.
When should I fertilize my houseplants?
like excessive amounts of light or water Your plants may suffer if you use too much fertiliser. During the growing season, which runs from early spring to late summer, we advise fertilising indoor plants moderately. Plants will gain the most from new nutrients at this period, while they are actively growing. Depending on the fertiliser you’re using, you can typically fertilise your plants monthly or every other week. Read the label carefully because each brand may have a different suggestion for dilution and timing.
Fertilizer will not help newly potted or repotted plants. They haven’t even begun to use all the nutrients in their fresh potting mix! Wait 23 months after a fresh repotting before fertilising actively growing plants during the growing season to prevent potentially harming recently replanted plants. You can postpone fertilising until the following growing season if you potted during the autumn and winter.
Because of their decreased metabolic activity, plants in low-light conditions don’t require fertiliser. They don’t consume nutrients as efficiently as individuals who are in brighter light.
What do the numbers on fertilizer mean?
Three of the approximately 17 necessary plant nutrients are prominently featured on the front of the majority of fertilisers. The N-P-K ratio is represented by the three numbers you see: N stands for nitrogen, P for phosphorus, and K for potassium. The main macronutrients that your plant requires are these.
A fertiliser label can include an N-P-K ratio that looks like 10-5-8. Higher ratio fertilisers are more concentrated than lower ratio fertilisers. Do not assume that a fertiliser with greater numbers is superior than one with fewer numbers just because it has higher numbers. It just needs more water to be diluted with because it is more concentrated.
Micronutrients could be included in your fertiliser, making it a complete fertiliser. These can contain things like chlorine, iron, manganese, zinc, copper, boron, and molybdenum. Each micronutrient plays a part in the cellular, enzymatic, and developmental processes of plants, but they are not as essential as the NPK macronutrients. Your fertilizer’s micronutrient content will probably be listed on the back of the container.
For your indoor plants, you can use any all-balanced fertiliser (for instance, 5-5-5) or one with a ratio that fits the goal you want to achieve. In order to stimulate leaf production, for instance, a fertiliser with a higher nitrogen to phosphorous ratio is best, whereas a higher phosphorous to nitrogen ratio aids in promoting fruiting and blooming.
Is solid or liquid fertilizer better?
There are various types of fertilisers. It is mainly a matter of preference when selecting the type of fertiliser to use. Both give the vital nutrients that plants require, yet they each have advantages and disadvantages.
The two types of fertilisers used most frequently for indoor plants are liquid and powder. They may also be the most economical depending on how concentrated they are, or how high their N-P-K ratio is. Fertilizers in liquid and powder form are also simple to use and diluted in water. You can also immediately add a variety of powder fertilisers to the potting soil.
Perhaps less frequently used for houseplants are solid fertilisers, sometimes known as dry or granular fertilisers. Because some granular fertilisers (fertiliser pellets) release nutrients over time, you run the risk of overfertilizing a plant or fertilising it when it is dormant or growing slowly because of poor light.
Is chemical or organic fertilizer better?
Another option is selecting between synthetic fertilisers, commonly known as chemical fertilisers, and organic fertilisers. The macro and micro nutrients in synthetic fertilisers are typically more precisely balanced and concentrated. They might be more affordable, particularly if you buy them in liquid form to dilute. With less, you can obtain the same amount of nutrients.
Organic fertilisers are typically less concentrated because they are created from all-natural components, such as reprocessed food waste. However, mild is a benefit, not a drawback, of houseplant fertiliser. Although it can be slightly more expensive than other forms, organic fertiliser is a safe, chemical-free choice. Choosing an organic fertiliser may be the finest option if you have pets who share your space.
Chemical and organic fertilisers both supply nitrates, potassium ions, and phosphates to plants, but in different ways. It strikes a balance between your personal preferences and those of your plants.
Quick Tips for Fertilizing Houseplants
First tip: Since plants begin to actively grow in the spring, it is the optimal time to begin fertilising them. Fast-growing plants should get fertiliser more frequently than slower-growing or dormant plants, such as cacti (i.e., most plants in winter.)
Second tip: Dilute your fertiliser. Less fertilisation is preferable to more fertilisation. If the potting mix is deficient in nutrients and you haven’t fertilised in about a year, you can improve the efficacy of the fertiliser by diluting it with less water.
3. Plants that produce fruits or flowers over their lifetimes will need extra fertiliser. Picking off fruits or flowers depletes them of their nutrients, which we should replenish.
Know your N, P, and K values. The ratio of macronutrients that should be present in your fertiliser is the one that your plant requires. It resembles the numbers 10-8-10. Find another fertiliser if this isn’t stated on the package.
5. Plants only require a smaller amount of micronutrients than they do of macronutrients, notwithstanding their importance. Micronutrients are typically present in fertilisers, however they aren’t usually highlighted on the front of the fertiliser container.
Do you need to fertilise every indoor plant?
As a general rule, only fertilise indoor plants when they are actively growing. While they are dormant, feeding them might cause their foliage to burn or even result in their death.
Don’t overfertilize your plants. Follow the instructions on the product you’re using because using too much can be just as bad as using too little. You should halve the concentration of liquid fertilisers if you want to be safe.
Which fertiliser promotes faster growth in houseplants?
It’s not difficult to encourage your foliage plants to produce more leaves. First, I advise adhering to all the correct care instructions for the specific plant that are listed in this page. Make sure you have enough light, enough moisture, and the right kind of fertiliser.
Use high-nitrogen houseplant fertiliser AND artificial plant lights if you truly want to boost leaf development. High-nitrogen fertilisers are made to encourage quick development and a deep, lush green hue in your plant’s leaves (where the first number is higher than the other two).
I advise exposing foliage plants to artificial lighting for 810 hours every day (as I have previously explained). Then, to encourage foliage growth, feed them frequently with a high-nitrogen fertiliser. Very soon, you’ll have a tonne of gorgeous, luxuriant leaves!
Remember to always apply fertiliser to indoor plants according to the manufacturer’s instructions. And to find out how frequently it has to be fed, check the care instructions for your particular plant. These rules are simply basic recommendations. Some plants could require more or less nutrition than others.
Which plants ought to be fertilised sparingly?
Butterfly weed (Asclepias tuberosa), false indigo (Baptisia australis), asters, pinks (Dianthus spp.), rock roses (Helianthemum spp.), sea holly (Eryngium spp.), bee balm (Monarda didyma), speedwell (Veronica spp.), and coneflowers (Echinacea spp.) are perennial plants that thrive without
Miracle-Gro: Is it a reliable fertiliser?
If used properly, Miracle Grow is a good all-purpose fertiliser that will likely benefit most plants. However, a fertiliser may be more appropriate for that particular purpose depending on what you’re attempting to grow.
As a highly concentrated fertiliser, Miracle-Gro has the potential to quickly kill or seriously harm your garden plants if used excessively.
If you use Miracle-Gro sparingly and properly according to the usage instructions, it’s a great fertiliser.
Miracle-Grow gives plants an absurd amount of nitrogen so they can grow big, bushy, green, and quickly. The issue with Miracle-Grow is that its nitrogen is produced using synthetic ammonium and nitrates, which results in off-chemicals that are detrimental to worms, soil bacteria, and other soil life.
By combining Epsom salt, baking soda, and household ammonia, you may create your own miracle plant.
For information on how to effectively utilise nematodes to control garden pests, visit this article.
Why are indoor plant leaves yellowing?
To figure out why your favourite houseplant has suddenly started to produce yellow leaves, you don’t need to be Sherlock Holmes, but you will need to perform some investigation. This is due to the fact that yellow leaves might indicate a variety of conditions. Here are seven typical causes of yellow leaves in houseplants.
1. Water
Yellow leaves can be caused by either too much or too little water. Your plant may eventually sacrifice some of its foliage in an effort to conserve moisture if it is not given enough water. Conversely, too much water will frequently cause the death of your plant’s roots because they are unable to breathe in saturated soil. Yellow leaves will also grow on your plant as a result of this.
Start by making sure your plant is in a pot with drainage holes at the bottom if you want to avoid any of these issues. Between waterings, the extra water will be able to drain via these holes. When the top inch of soil seems dry to the touch, water your plants only then. From pot to pot, frequency may vary depending on factors like size (larger pots with more soil generally need less frequent watering), season (most plants don’t use much moisture during the dark days of winter), and plant type (succulents, for example, don’t need as much water as heavy drinkers like peace lilies).
2. Light
If houseplants receive too much or too little light, their leaves may also become yellow. If plants that prefer shade, such as tropical ferns, nerve plants, and calathea, are forced to dwell in a bright location, their leaves will gradually start to turn yellow.
Conversely, if cultivated in gloomy settings, sun-loving indoor plants like succulents, crotons, and jade plants may begin to yellow. When purchasing a new houseplant, always read the label and put it in a location that meets its light needs. Most types of houseplants will thrive in direct, bright light.
3. Delivery
It might not be a problem if your houseplant begins to drop yellow leaves as soon as you get it home from the garden centre. Most likely, your plant is simply shedding leaves it can no longer support as it adjusts to the lower light levels in your home. Some species, like the ficus, for instance, will occasionally drop their yellow leaves when they are relocated. But don’t worry; usually, after a little period of adjusting, your plant will produce a new crop of foliage.
Repotting houseplants shouldn’t be done for at least a week or two after you get them home, to give them time to become used to their new surroundings and reduce transplant stress.
4. Resilience
Lower leaves on older plants frequently turn yellow and drop off. Your plant is not sick as a result of this. It simply means that the plant no longer requires those lower leaves because they are now shadowed by higher foliage. Additionally, keep in mind that many typical houseplants are actually trees in their original habitats, and that when they grow larger, they attempt to develop a trunk by shedding their leaves. For instance, Norfolk Island pines sometimes sacrifice their lower boughs as they get taller and taller.
Five. Hunger
If a houseplant lacks some essential nutrients in the soil, they will also grow yellow or splotchy leaves. Since plants are typically cultivated and marketed in nutrient-rich potting mix, this is typically not an issue when you initially purchase a plant (and most of our plants come with a time-release fertiliser added). To retain healthy leaves, however, your plants will eventually exhaust the food that they were given and require a little boost of plant food. Every time you water your plants, give them a small amount of diluted liquid fertiliser to keep them healthy.
6. Pests
Yellow leaves on your houseplants can also be caused by indoor plant pests like aphids and spider mites. Both suck plant juices, which makes the leaves appear aerated and fading. Aphids have tiny rice-grain-like attachments at the ends of their stems. Spider mites produce fine-hair-like webs on the undersides of the leaves of your plants, but they are nearly impossible to notice with the naked eye. An organic insecticide for houseplants can be used to control both pests. Maintain a high degree of humidity around your plants because these pests also thrive in dry air.
7. Thermometer
Because they are tropical plants, indoor plants don’t like harsh weather. Your plants may drop yellow leaves if they are forced to dwell too close to a heat vent, fireplace, air conditioner, or draughty window or door. Most houseplants grow in a range of 65 to 80 degrees Fahrenheit.
Don’t overdo it
If the dosage is too high or you apply the fertiliser too frequently, it might burn the roots of plants. In a large grow pot, salts are harder to remove from the soil than they are in a garden.
For instance, do not increase the fertilizer’s recommended ratio from 1 oz per gallon to 4 oz per gallon in the mistaken belief that the plant will benefit.
To prevent burn, I regularly apply fertilisers (aside from Eleanor’s) at half strength for indoor plants.