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.
Should indoor plants be fertilized all year long?
Typically, it’s better to cease fertilizing indoor plants in October, especially in temperate regions with particularly long winter nights and short winter days. After all, a lot of them just stop operating during that period of the year. While they might not all completely go dormant, their growth is frequently at a standstill or at the very least painfully slow. Some plants do continue to develop despite the reduction in lighting, but it is best to avoid fertilizing them to promote growth during the off-season. What you don’t want is for that to lead to growth that is pallid, frail, and etiolated. I really remove the majority of the winter growth from my indoor plants so that the spring growth will be considerably more vigorous.
As long as they can sustain 12-hour days or longer, gardeners who grow their plants under lights can continue fertilizing their indoor plants year-round.
But as the days lengthen again in late February and early March, many plants begin to clearly demonstrate growth. No, it isn’t yet summer, but they are beginning to awaken and put on growth since there are more than 11 hours of daylight each day (and that number is rising every day!). And you should fertilize plants as they are growing.
It’s important to keep in mind that fertilizer should never be supplied to encourage growth or blossoming instead it should always be given as a treat. Therefore, you should begin fertilizing houseplants when they begin to grow again. (Are you expanding? How beautiful! I’ll feed you!
Before the end of February, some Northern Hemisphere houseplants will have started growing, so fertilize those first. However, you’ve certainly seen some houseplants that aren’t quite ready yet. Only in late March or early April might they begin to show signs of growth. Wait a little longer if so. Always heed the advice of the plant; it will “inform you when it is appropriate to fertilize.
Which fertilizer ought to be applied? That is essentially unimportant. Simply make use of what you have. For further information, see Plants Can’t Read Fertilizer Labels.
The most important thing is to always fertilize softly, most likely at a level much lower than that specified on the product label. For the majority of indoor plants, one-quarter to one-eighth of the suggested dose is adequate. The idea that “A marketing ploy used to sell additional fertilizer is the growth booster type fertilizers, which are high in minerals and intended to stimulate a quicker recovery. Rather than being flooded with more minerals than they can reasonably use in a short amount of time, plants prefer to receive their fertilizer gradually.
There is no need to rush, but if your houseplants are currently growing, it’s time to re-fertilize them! By the end of March, most ditherers will undoubtedly be ready for a few additional minerals!
Do I water houseplants after fertilizing them or before?
The biggest cause of indoor plants dying in people’s homes is improper watering practices, such as using too much or too little water. Of course, watering isn’t the sole reason some plants die, but most of the time, improper watering causes plants to wither. Here are some general recommendations for watering your houseplants, followed by some advice for fertilizing them.
- Make sure your plants are in a container with a drainage hole and that the container is sitting on a saucer. You can water them well without worrying that your floors will become flooded or soiled if you use a saucer that is deep enough to capture a significant amount of water.
- Every four days, check on your plants to see if the soil seems and feels dry. Squeeze it. Check to see if there is a gap where the dirt has separated from the pot. That’s yet another indicator of the soil’s dryness. Smaller pots may be lifted to determine their weight, and by frequently doing so, you can determine how much a dry plant weighs.
- When a plant is dry, give it enough water that the saucer below fills with water. The plant will be able to absorb all the water if the pot is left submerged in a saucer of water for a few hours. The next day, if you see that there is still a sizable amount of water in the saucer, blot it up with a cloth or a turkey baster.
- Because the soil and roots aren’t adequately hydrated, providing too little water, watering infrequently, or applying “a lick and a promise” is just as terrible as not watering at all. Do not skimp on your waterings.
- Roots will decay if they receive too much water. For this reason, you should water well before waiting a few days before doing so again. The roots will decay in pots that are left submerged in deep water for more than a few hours.
If your plant is housed in a beautiful pot, make sure to remove any leftover water after watering. Give the plant plenty of water, let it sit in the pot for one or two hours, then drain any extra.
Look at the saucer on the right where water has gathered. That can remain in the saucer because it is not much. However, it indicates that this plant did receive thorough watering.
Trays are under the plants in this window to collect water. The Maxsea fertilizer bottle is one that the staff likes to use when synthetic fertilizer is required.
- Never feed a plant that needs water. Water thoroughly first, and fertilize the following day. This is particularly valid if you’re using synthetic fertilizer.
- From October through February, you shouldn’t fertilize indoor plants unless they flower in the winter, like some orchids and all citrus. The plants typically take a break from growing during this period of short days and don’t require those extra nutrients.
- Between mid-February and mid-March, start fertilizing once more. Throughout the summer growing season, fertilize frequently.
- For information on how much fertilizer to give your plants, refer to the package instructions.
Two organic fertilizers made by Coast of Maine are made specifically for indoor plants. A nice fertilizer to use on flowering plants, including African violets, is Tiger Bloom.
This organic fertilizer is a popular since it contains minerals and soil-feeding elements like earth worm castings. Given that most houseplants are produced for their foliage and that this fertilizer contains a higher dose of nitrogen to encourage leaf growth, it is particularly beneficial for houseplants.
This is just one of the numerous products we provide that include living soil organisms like mycorrhizae. It’s especially beneficial for plants that have spent more than two years in the same container and soil.
How do you know when to fertilize plants?
Portland, Oregon
Garden plants would take care of their own needs in an ideal world. As it stands, we occasionally need to assist them.
Plants absorb nutrients from the earth, however fertilizer is needed when those nutrients aren’t there.
According to Weston Miller, a horticultural with the Oregon State University Extension Service, “plants pull out nutrients as they grow.
The plant suffers if they aren’t reinserted.
But it’s not always obvious which fertilizer to use, how much to apply, and which plants to feed. Understanding the requirements of the plants is crucial.
“You must be aware of the types of plants you have and their needs, Miller advised. “Prior research is quite beneficial.
The majority of landscape shrubs, trees, and perennials don’t require any fertilizer unless they are exhibiting signs of stress, such as yellowing leaf.
“You may have a beautiful landscape that requires very little fertilizer if you prepare the soil by adding compost or other organic material well before planting, he said.
Annuals require frequent fertilization, especially if they are grown in containers. Weekly applications of fertilizer that dissolves in water are recommended.
Furthermore, vegetables require a lot of nutrients. When planting, add fertilizer as directed on the label. Use a water-soluble variety early on in the season to give plants a head start. Feed two to three times with a nitrogen-rich fertilizer for maize and garlic (the N in the N-P-K on the label). According to Miller, blood meal is a fantastic option for organic gardeners. Otherwise, keep an eye out for foliage that has turned yellow. Feed the plant some fertilizer if it begins to appear strained.
As heavy feeders, fruit trees and berries—especially blueberries—will produce more fruit if fertilizer is added at the proper time. Specific rules apply to each variety of plant. Publications on specific plants, such as Growing Strawberries in Your Home Garden and Growing Blueberries in Your Home Garden, can be found by searching the Extension catalog.
Several factors will determine how you should fertilize your lawn. Feed your lawn at least twice a year if you irrigate it and want it to be green in the summer. Apply the “Memorial Day and Thanksgiving break schedule. To ensure thorough coverage and prevent overfertilizing, always use a spreader. One application is the same as mulch mowing and letting the nitrogen-rich clippings remain on the lawn. One feeding every year can keep your lawn more weed-resistant if you decide to let it lie dormant.
Compared to many other garden shrubs, some plants, like roses and hydrangeas, can benefit from additional food. Similar to fertilizers for plants that prefer an acidic (low pH) soil, you can purchase products branded expressly for them. These include citrus, blueberries, gardenias, and rhododendrons.
According to Miller, plants don’t care whether they receive their nutrition from organic or synthetic fertilizers. To them, everything is the same. Ingredients for organic fertilizer are derived from plant, animal, or mineral sources. Examples include kelp, soft rock phosphate, alfalfa meal, blood and bone meal, and green sand. The production of inorganic materials involves a chemical process.
Every fertilizer has a ratio, which is the proportion of N, P, and K by weight (nitrogen, phosphorous and potassium). Typically, plants use nitrogen to promote green growth, phosphorous for the formation of roots, and potassium for the growth of flowers and fruits. For veggies and other high-nutrient plants, a balanced fertilizer like 10-10-10 is a wise choice.
If you’re shopping for organic fertilizer, be sure the label says OMRI. Avoid items containing fish, blood, or bone meal if you’re vegan or vegetarian. Select a fertilizer with a gradual release for inorganic compounds. If the plant doesn’t require all the nutrients, the fertilizer may seep into the groundwater or flow off into streams, polluting the environment.
Lime is a soil additive that raises pH levels, which is crucial for crops. A soil test or the label of lime products should be used to determine whether to apply lime for gardeners who live west of the Cascades.
After applying fertilizer, always water it in, and don’t forget to read the directions. Overuse can cause plants to burn.
Consult Fertilizing Your Garden and Growing Your Own by OSU Extension for more details on fertilizing.