When indoor plants get thirsty, they wilt. When their leaves don’t receive enough sunshine, they become pale and lanky. They get crispy at low humidity levels, while they may go rotten at high humidity levels. It is far more difficult to determine when to fertilize houseplants. Other than possibly delayed or sluggish development, which is often scarcely noticed by houseplant parents, your plant won’t provide you a direct signal that it’s time to feed it. Therefore, you’ll have to take matters into your own hands and utilize houseplant fertilizer on a schedule that is dependent on their growing cycle rather than waiting for a signal from the plant.
There’s no need to unnecessarily complicate the process, but each particular houseplant has slightly variable requirements for houseplant fertilizer levels and frequency. Yes, you could research the specific nutritional requirements of each species of houseplant you look after, but in reality, the vast majority of common houseplants have fertilizer requirements that are sufficiently similar that treating them in a single way is more than sufficient to meet their nutritional needs. It’s true that some houseplants require more food than others. However, a timetable for fertilizing houseplants like the one below provides a solid compromise that both satisfies heavy feeders and prevents you from overfeeding houseplants that just need a little fertilizer.
Here is the recommended fertilizer regimen for the majority of indoor plants. It is based on the growing season’s cycle, which, despite being indoors where temperatures are more stable, affects houseplants in a manner similar to how it affects outdoor plants.
How frequently should indoor plants be fertilized?
When indoor plants are actively growing in the spring and summer, fertilize them. Use a fertilizer that is complete and contains potassium, phosphorus, and nitrogen. Fertilizers for indoor plants can be found in liquid, crystal, granular, spike, and tablet form. Depending on the product, application frequency might range from once every two weeks to once every three to four months. Read the directions on the label attentively.
During the winter, avoid fertilizing indoor plants. Most houseplants are not actively growing in winter and don’t need fertilization.
Do you need to fertilize indoor plants year-round?
You are aware that indoor plants require water and sunlight, but what about fertilizer? 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 fertilizer available, what fertilizer is (hint: it’s not plant food), and how and when to fertilize houseplants are all covered in the sections below.
What is fertilizer?
First and foremost, plants do not eat fertilizer. Photosynthesis is the process through which plants produce their sustenance while utilizing sunlight. Fertilizer promotes fresh, healthy growth in a similar manner to a multivitamin. Additionally, it can be utilized to replenish the vital minerals that our plants’ potting soil loses as they mature. The main ingredients, or macronutrients, in fertilizers 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 fertilizer. During the growing season, which runs from early spring to late summer, we advise fertilizing indoor plants moderately. Plants will gain the most from new nutrients at this period, while they are actively growing. Depending on the fertilizer you’re using, you can typically fertilize 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 fertilizing actively growing plants during the growing season to prevent potentially harming recently replanted plants. You can postpone fertilizing 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 fertilizer. 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 fertilizers. 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 fertilizer label can include an N-P-K ratio that looks like 10-5-8. Higher ratio fertilizers are more concentrated than lower ratio fertilizers. Do not assume that a fertilizer 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 fertilizer, making it a complete fertilizer. 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 fertilizer (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 fertilizer 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 fertilizers. It is mainly a matter of preference when selecting the type of fertilizer to use. Both give the vital nutrients that plants require, yet they each have advantages and disadvantages.
The two types of fertilizers 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 fertilizers to the potting soil.
Perhaps less frequently used for houseplants are solid fertilizers, sometimes known as dry or granular fertilizers. Because some granular fertilizers (fertilizer pellets) release nutrients over time, you run the risk of overfertilizing a plant or fertilizing it when it is dormant or growing slowly because of poor light.
Is chemical or organic fertilizer better?
Another option is selecting between synthetic fertilizers, commonly known as chemical fertilizers, and organic fertilizers. The macro and micro nutrients in synthetic fertilizers 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 fertilizers 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 fertilizer. Although it can be slightly more expensive than other forms, organic fertilizer is a safe, chemical-free choice. Choosing an organic fertilizer may be the finest option if you have pets who share your space.
Chemical and organic fertilizers 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 fertilizing them. Fast-growing plants should get fertilizer more frequently than slower-growing or dormant plants, such as cacti (i.e., most plants in winter.)
Second tip: Dilute your fertilizer. Less fertilization is preferable to more fertilization. If the potting mix is deficient in nutrients and you haven’t fertilized in about a year, you can improve the efficacy of the fertilizer by diluting it with less water.
3. Plants that produce fruits or flowers over their lifetimes will need extra fertilizer. 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 fertilizer is the one that your plant requires. It resembles the numbers 10-8-10. Find another fertilizer 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 fertilizers, however they aren’t usually highlighted on the front of the fertilizer container.
In the fall, should indoor plants be fertilized?
During the fall and winter, indoor plants won’t require any fertilizer, but they might enjoy one last treat. Plant Mom advises doing this right away, while the earth is still damp, right after a shower. Plant Mom advises using a liquid all-purpose fertilizer at half the recommended dosage, not making it a full meal.
Adjust Your Watering Routine
Although it may seem contradictory, the majority of indoor plants require less water in the winter. Despite the fact that winter air is dryer, plants develop more slowly and some even fall into complete dormancy during the colder months. As a result, plants require less water to maintain their hydration, and overwatering can cause root rot. Remember that different plants require varied amounts of water. Drought-tolerant cacti and other succulents may not require any watering, whilst certain tropical plants may still need more frequent watering.
Winter months can cause surface soil to dry up more quickly, but it isn’t necessarily a sign that the plant needs water. When the soil is dry an inch or two below the surface, test it with your finger; if it is, it’s time to get the watering can out.
Tip
Do not water your houseplants with cold water. To prevent shocking the roots of the plant, use water that is close to room temperature. In some winter climates, tap water can become very chilly; thus, wait several hours before using it to water your plants. This kind of gradual warming also enables dissolved gases, such chlorine, to evaportate from the water.
Alter Humidity Levels
The largest challenge that indoor plants face throughout the winter months is often low humidity levels. Plants like a humidity level that is closer to 50%, which might drop to 10 to 20% in heated homes during the winter. If your home has a humidifier, move your plants there so they can benefit from it. If you don’t have a humidifier, find another way to increase the humidity.
Organize your plants first into groupings. Plants naturally release water through their leaves through transpiration, thus combining them will make good use of that moisture. Because they absorb moisture from showers and cooking, bathrooms and kitchens are the greatest places to keep plants.
The age-old method of putting your plants on or close to a tray of water is another excellent choice. But avoid letting the plants submerge themselves in the water. Put stones or pebbles in the tray to elevate the pots’ bottoms above the water line, then set the pots on top of the stones. By doing this, humidity levels will rise without encouraging root rot.
Instead than helping the plants, misting usually works better at making the gardener feel good about themselves. You might believe that spraying your plants will provide them with some comfort, however misting just provides a brief burst of moisture. Because indoor temperatures allow moisture to evaporate quickly, misting is necessary several times a day to be effective. Try misting if you only have a few plants and believe you will be really diligent about it. An indoor plant may rarely be over-mist. Misting plants in humid summers can result in fungal issues, but this shouldn’t be a concern in the winter.
Pay Attention to Temperature
Like most people, most plants thrive in temperatures above 50 degrees Fahrenheit at night and between 65 and 75 degrees Fahrenheit during the day. Keep your plants away from heat sources like radiators, ovens, fireplaces, and electronics in order to give them that, as well as from chilly drafts. Houseplants can die from temperature changes just as quickly as from extended exposure to heat or cold.
Follow the Sun
In addition to having fewer daylight hours, wintertime sunlight also comes in at a lower angle. Your houseplants might need to be moved to a brighter location or even given more light. An all-day sunny window with a south or west orientation is an ideal location. Moving plants next to a chilly window, however, should be avoided since they might experience a draft.
Every time you water your plants, rotate the pots by roughly a quarter of a turn. This prevents some branches from reaching for the light, allowing the plant to grow evenly and receive some sun on all sides.
The amount of light that reaches plant leaves can also be diminished by layers of dust. This dust can be removed from leaves with a moist cloth, giving plants more access to light during the winter.
Plants will need to be exposed to the grow lights for extended periods of time in regions where the winter sun is essentially nonexistent and where the majority of their light comes from supplemental lighting. If a plant needs six hours of direct sunshine, it can also require an additional 12 or 14 hours of light to provide the same amount of energy. Grow lights are far less strong than sunlight, thus plants require more time under them to absorb enough energy.
Put Your Houseplants on a Diet
Because they are not growing as quickly in the winter, the majority of houseplants don’t require any fertilizer. Stop feeding them until early spring as continuing to do so would only disrupt their natural cycle. Resuming fertilization will give them a boost for the growing season if you start to notice new growth or the present leaves seem to be turning greener.
Some tropical plants grow rather actively all winter long, especially vining climbers or trailers, and they may still need some feeding, but often at decreased rates.
How can I tell whether or not my plants require fertilizer?
A good query! There are numerous factors that can make a plant appear to be nutrient deficient.
Take a moment to rule out overwatering (damp yellow) or a lack of water before you move on to fertilizing (crispy or dead). Next, scan the foliage for disease or insect damage indications. Could the foliage be distorted as a result of drift from a weed killer? Check for indications that nutrients are deficient while keeping those items in mind. Here is a useful example:
- A plant may need nitrogen if its mature leaves turns from light green to yellow.
- A plant may exhibit chlorosis—light green leaves with dark green veins—as a warning that it requires potassium.
- There may be a phosphorus deficiency if elder leaves are turning purple at the base and other leaves are dull and dark green.
A soil test can help shed light on any nutrient issues if none of these work or if you’re unsure. Always get advice from the staff at your neighborhood garden center when choosing the ideal fertilizer for your plants and soil. They are there to help with that.