Top 10 Best Fertilizer for Indoor Plants | 2021 Reviews

Indoor plants are trendier these days, no matter how big or small these can be. Many people grow different species at home, and they have more plants inside than outside their backyard. One reason is that these plants are excellent in aiding stress. 

If you’re interested in growing indoor plants, too, there are many species to try. Regardless of any plant you prefer, it’s best if you can apply an effective fertilizer to let it grow beautifully and healthily inside your room. If you want to buy the best fertilizer for indoor plants, here are some options to consider purchasing. 

Top 10 Best Fertilizer for Indoor Plants Reviewed

  1. Indoor Plant Food Spikes by Miracle-Gro – Best Overall
  2. All Purpose Liquid Plant Food by Schultz – Best Value
  3. Water Soluble All Purpose Plant Food by Miracle-Gro – Editor’s Choice
  4. Premium Indoor Plant Food by EarthPods
  5. 274150 Smart-Release Plant Food by Osmocote
  6. 09524 Purpose Granular Fertilizer by Jobe's Organics
  7. Jacks Classic No.4 by JR Peters
  8. Time Release Fertilizer Spikes by Jobe's Organics
  9. INPF8 Organic Indoor Plant Food by Espoma
  10. All-purpose House Plant Fertilizer by Aquatic Arts Store

#1. Indoor Plant Food Spikes by Miracle-Gro – Best Overall

Indoor Plant Food Spikes


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  • Fertilizer-Type: Granules/Spikes
  • Formulation: 6-12-6
  • Quantity: 48 spikes

If you’re looking for an impressive fertilizer for your indoor plant, the Indoor Plant Food Spikes by Miracle-Gro is what most gardeners recommend for beginners. 

It’s easy to use, which is why it’s very favorable if you don’t have enough time to monitor your fertilization-frequency. Whether you’re planting spider plants, pathos, ferns, or croton, these spikes are very effective, and it can last up to two months. 

The formulation of this fertilizer is enough to supply the necessary nutrients that your plant needs, especially phosphorus. Plus, it comes with micronutrients, too, which makes it very competitive compared to other fertilizers.  

Long-lastingHassling to separate spikes 
Safe to useNot ideal for spices

#2. All Purpose Liquid Plant Food by Schultz – Best Value

All Purpose Liquid Plant Food


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  • Fertilizer-Type: Liquid
  • Formulation: 10-15-10
  • Weight: 32 ounces

Another competitive fertilizer that’s exceptional for indoor plants is the All Purpose Liquid Plant Food by Schultz. If you want a versatile one, it will not disappoint you because you can also use it for outdoors. 

The formulation of this fertilizer has higher N-P-K contents, which guarantees that your plants will grow and develop healthily inside your house. It’s ideal for first planting or transplanting because of its effectiveness. 

In applying this fertilizer, it only needs seven drops of water as you water your plant. You can fertilize your plant once or twice every month. Plus, it will only take 14 drops in a liter, which makes it cost-effective, too. 

Cost-effectiveMore frequent application than fertilizer spikes
Easy to applyToo potent for other plants

#3. Water Soluble All Purpose Plant Food by Miracle-Gro – Editor’s Choice

Water Soluble All Purpose Plant Food


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  • Fertilizer-Type: Powdered
  • Formulation: 24-8-16
  • Weight: 5 pounds

Another effective fertilizer for indoor plants is coming from Miracle-Gro. If you can’t decide what to use, you can consider buying the Water Soluble All Purpose Plant Food. 

You’ll love this fertilizer because it can instantly boost your plant’s growth, which is ideal if you have bigger plants inside. It’s suitable for vegetables, trees, flowers, and shrubs, too, making it multipurpose. 

Aside from that, you can assure that your plants will not have any damages, like burns, because it uses safe ingredients. It has all the nutrients that your plant needs to thrive, making it look healthier and more appealing. 

The best way to apply this fertilizer is every one to two weeks, thanks to its instant nutrition. As you continue to take care of your plant, you’ll see better results after your plant absorbs all the nutrients it contains. 

Works well in city dirtNot ideal for delicate plants
Effective on flowersWeak packaging

#4. Premium Indoor Plant Food by EarthPods

Premium Indoor Plant Food


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  • Fertilizer-Type: Slow-release
  • Formulation: 2-2-4
  • Quantity: 100 pieces

The Premium Indoor Plant Food by EarthPods by is also an exceptional choice to consider if you want an easier life in maintaining your indoor plants. 

The convenience of this fertilizer is what most gardeners prefer because it comes with pre-measured capsules. It’s not only easy to apply but also effective. With this set, you have a five-year supply of fertilizers for your plant.

This fertilizer is also eco-friendly and vegan-friendly, which is a plus factor for this fertilizer. With its micronutrients, macronutrients, and trace minerals, your plant will continue to grow without any hindrance. 

Not very messy to applyLow N-P-K formulation
Compact Pricey

#5. 274150 Smart-Release Plant Food by Osmocote

274150 Smart-Release Plant Food


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  • Fertilizer-Type: Slow-Release
  • Formulation: 15-9-12
  • Weight: 1 pound

Osmocote also offers a slow-release fertilizer that you can consider purchasing, too, because of its exceptional formulation. It contains 11 nutrients, and these will make all your indoor plants in excellent condition and promote vibrancy. 

You can feed your plant for up to six months with this fertilizer, which is the best option if you have a tight budget. Plus, it doesn’t have harmful ingredients that can harm your plant. 

In applying this fertilizer, put the right amount using the inclusive scooper. It should be one scoop every two gallons. After that, mix it into your soil’s top surface, and water it daily. 

Has 11 important nutrientsBeads are not eco-friendly
High nitrogen-contentIngredients can by toxic 

#6. 09524 Purpose Granular Fertilizer by Jobe's Organics

09524 Purpose Granular Fertilizer


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  • Fertilizer-Type: Granules
  • Formulation: 4-4-4
  • Weight: 16 pounds

If you’re looking for organic fertilizers, you should check out what Jobe’s Organics has to offer, like the 09524 Purpose Granular Fertilizer. It doesn’t disappoint when it comes to its effectiveness, even when it doesn’t use any synthetic chemical. 

Many gardeners buy it because it can make your plants damage-resistant, thanks to its Biozome features. Plus, it can also save your plant during drought. 

Many prefer this fertilizer because you can also use it on other plants, like trees, shrubs, flowers, and vegetables. 

Has a certification from USDAGrowth of fungus
Bag is resealableUnpleasant odor

#7. Jacks Classic No.4 by JR Peters

Jacks Classic No.4


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  • Fertilizer-Type: Powdered
  • Formulation: 20-20-20
  • Weight: 4 pounds

If you prefer a water-soluble fertilizer for your indoor plants, you can never go wrong with the Jacks Classic No.4 by JR Peters. 

Many gardeners use it for both small and tall plants because of its exceptional formulation, which provides ample nutrients to make your plant healthy as it grows. The blend is right for optimal nutrition, keeping the root system strong. 

Another reason why many admire it is that it’s not too hassling to apply. Thanks to its free measuring spoon, over-fertilizing is not a problem anymore. Plus, it doesn’t contain harmful ingredients, preventing your plants from damages. 

Has improved micronutrient packageNot ideal for some indoor plants
Comes with a measuring spoonCauses burns on some plants

#8. Time Release Fertilizer Spikes by Jobe's Organics

Time Release Fertilizer Spikes


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  • Fertilizer-Type: Granules/ Spikes
  • Formulation: 13-4-5
  • Weight: 50 spikes

Another spike fertilizer that you should check out is the Time Release Fertilizer Spikes by Jobe’s Organics. It will feed your plant for two months, assuring continuous growth even when you don’t apply it frequently. 

The best advantage of this fertilizer is that there is no wasteful runoff or smell, and it’s an advantage for indoor plants. All you need is to insert it into your soil and let the roots absorb the nutrients it needs for development. 

Another reason why it’s ideal for indoor plants is its nitrogen-content. It will grow healthily despite being inside the house. What you need to remember is to put it in areas with a light source. 

No wasteful runoffPoor customer service
Hassle-free to useToo slow to dissolve

#9. INPF8 Organic Indoor Plant Food by Espoma

INPF8 Organic Indoor Plant Food


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  • Fertilizer-Type: Liquid
  • Formulation: 2-2-2
  • Weight: 16 ounces (8 ounces per bottle)

The INPF8 Organic Indoor Plant Food by Espoma is best for beginners who decided to grow indoor plants because it comes in package of two 8-ounce bottles. It may not be big as other fertilizers, yet it supplies enough nutrients to keep your plant growing as you put it inside your house. 

Its N-P-K formulation is effective for small indoor plants, and it comes with microbes, which deliver better results. Since it’s a liquid fertilizer and pre-measured, you don’t have to mix it anywhere. All you need to do is turn the bottle upright, open the lid, and apply it to your soil. 

The smell is a little off because it’s strong, yet it doesn’t stay too long inside your room. 

Contains natural ingredientsNot ideal for larger indoor plants
Ready to useHas an undesirable odor

#10. All-purpose House Plant Fertilizer by Aquatic Arts Store

All-purpose House Plant Fertilizer


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  • Fertilizer-Type: Liquid
  • Formulation: 3-1-2
  • Weight: 8 ounces or 16 ounces

If you want the best fertilizer that will let your plants survive in hangers, holders, or pots, the All-purpose House Plant Fertilizer by Aquatic Arts Store is what you should consider buying.

It’s multipurpose because it’s effective on all indoor plants, like the Jade plant, Pothos, and Aglaonema. You need to apply a teaspoon of this liquid fertilizer to every two cups of water. As you apply it, all the nutrients it contains, along with vitamins, will help your play stay healthy for the rest of its lifespan. 

Aside from that, this bottle will last for a year if you have the right number of indoor plants at home. It’s worth your money because it assures vibrant leaves and strong roots. 

Excellent in reviving plantsCan cause gnats to some plants
Doesn't burn the leavesNot ideal for herbs

Top Pick – Best Fertilizer for Indoor Plants

 When it comes to buying the best fertilizer for indoor plants, the top pick is the Indoor Plant Food Spikes. 

This fertilizer by Miracle-Gro is one of the most impressive fertilizers because it’s hassle-free to use, but it’s very effective on any indoor plant. As you learn the basics of taking care of indoor plants, it’s the best fertilizer you can use since it’s long-lasting. 

Another advantage is that it has the right blend of nitrogen, phosphorus, and potassium, which plants need to thrive and grow healthier. 

The convenience of applying it is also the reason why it’s perfect for beginners. There’s lesser effort, but you can monitor how it can affect your plant as you water it daily. If you don’t want a complicated way to apply fertilizers, you should buy this one. 

Buying the Best Fertilizer for Indoor Plants – Buyers Guide

As you look for the best one in the market, you’ll find many choices, which can leave you undecided. Here’s a buying guide to help you decide what fertilizer to buy. 

Determine What Fertilizer-Type to Buy

Most indoor plants are in pots or containers. You may not need to buy a lot unless you have many indoor plants. Here are the types of fertilizer to consider buying. 

Slow-Release Fertilizers

This type is also famous as a “time-released” fertilizer, and it comes from a synthetic nutrient-source. These come in capsules with coating, which gradually breaks down after applying it to your plant. The nutrients begin to break down in low doses, yet it’s convenient because you don’t have to apply frequently.

Granular Fertilizers

This type is the most typical and widely available in the market. You can buy it in either compressed “spikes” or pellets. In using spikes, you just need to push these down into your soil, next to your plant’s roots. As for pellets, sprinkle them on your soil’s surface. 

You’ll find organic fertilizers that contain bone meal, sulfate of potash, worm castings, blood meal, animal-based, and plant-based ingredients. As for synthetic chemical-based fertilizers, these are not very healthy for your plants. 

Liquid Fertilizers

These are easy to apply, but you’ll have to apply it more frequently. The best advantage of this fertilizer is that there are lesser chances for your plants to burn. Aside from that, it has many helpful ingredients, including amino acids, plant hormones, trace elements, vitamins, and micronutrients, which are necessary for indoor plants to survive. 

Check the N-P-K Nutrient Contents

On every fertilizer-packaging, you’ll notice a label with three numbers. It’s famous as the N-P-K formulation, which stands for nitrogen, phosphorus, and potassium, respectively. These are macronutrients that plants need to survive.

Nitrogen (N)

This macronutrient is a constituent of nucleic acids and proteins, which is its main function. With the right amount of nitrogen in your fertilizer, you don’t have to worry about your plant’s growth. It’s also a significant component of chlorophyll, which is necessary during photosynthesis. If you want your plant’s stem and leaves to grow healthier, look for a fertilizer with an abundant amount of nitrogen. 

Phosphorus (P)

This macronutrient promotes root development, letting your plant absorb necessary nutrients from your soil. It’s crucial in regulating protein synthesis, and it’s also helpful in any plant’s maturity. 

It’s not very obvious when it comes to detecting phosphorus deficiency. You can tell if your plant is phosphorus-deficient when your plant didn’t grow to its typical size. Another sign is when it took a while for your plant to mature. 

Potassium (K)

This macronutrient or potash is also an important factor in choosing fertilizers, especially if you’re planting flowers. It triggers enzymes, and it enables starch and protein synthesis. Plus, it corrects your plant’s development. 

When it comes to deficiency, one sign is the yellowing of leaves. When your plant lacks potassium-content, it has poor resistance to environmental changes, making your plants weaker. 

Other Macronutrients

In buying fertilizers, it’s also better if you can find one with Calcium (Ca), Sulfur (S), and Magnesium (Mg). 


Aside from macronutrients, some plants also need other compounds, which you can find in fertilizers, too. Some of the significant nutrients are Boron (B), Iron (Fe), Manganese (Mn), Zinc (Zn), and Nickel (Ni). 

Why It’s Crucial to Know Your Soil’s Nutrient Contents

Gardeners should always check their soil’s pH level and nutrient contents because these have variable contents. Some soil is acidic already, while some lack acidity. Testing it first is crucial to know what NPK formulation is suitable for you. 

Anything excessive can provide harmful effects on plants. There are many soil testing kits in the market that you can use to measure your soil’s nutrient contents and pH level, and it’s the first thing you need to do before planting anything in your pot or container. 

Fertilizing Indoor Plants: When the Best Time Is


During spring, you can begin fertilizing your indoor plant around eight weeks before the anticipated spring frost. This season, days start to lengthen, and these plants shift from their semi-dormant state to an active growth period. 

You should apply the first three fertilizer applications with the recommended half-dosage as per the label, whether it’s liquid or granular. 


As summer approaches, you can switch to a regular indoor plant program. The frequency depends on the fertilizer-type you’re applying to your plant. Liquid fertilizers are more frequent than granular or slow-release fertilizers. 


Eight weeks before the initially anticipated fall frost, you should taper off your indoor plant’s fertilizer frequency and amounts. 


You don’t have to apply any fertilizer during winter because indoor plants are not in the condition of active growth. It might only lead your plants to brown leaf tips and burns. However, if you’re in an area where you don’t get daily winter frosts, you can continue applying fertilizers. However, use a half-dose than the amount you apply during summer. 

If you’re living in a tropical climate, you should use the summer fertilization schedule for the whole year. 

Tips to Keep in Mind to Know if It’s Time to Fertilize

  • Most indoor plants are still semi-dormant or dormant in wintertime, even though these don’t have exposure to the elements. Even if you apply fertilizers, it will only result in weak growth. Also, it can only make your plant weak to insects to diseases. 
  • If your plant endures blooming during winter, you need to use a regular amount of fertilizer. As it grows, it only needs a half or one-fourth, which is lesser than the amount during summer. 
  • It’s best to start applying fertilizers on semi-dormant or dormant plants in the last week of February. Despite being indoors, these can still sense sunlight-alteration, letting these feel that spring is fast approaching. 
  • If your plant is unhealthy, don’t use excessive fertilizers because it will only kill your plant. It’s important to let it get ample water and light. Plus, they should not have any contamination. 
  • Check if the fertilizer you bought is suitable for potting soil before applying it. Most potting soil already has an amount of fertilizer, and if you add more, it might damage your plant. 
  • If you prefer to buy plants from a garden center, check if they applied fertilizers into the soil. You can immediately avoid over-fertilization by checking on the plant’s history before spending. 

How Frequent Should You Fertilize Indoor Plants

The frequency depends on the instruction per fertilizer. It’s best to check the label first to know how often you need to apply it, even for indoor plants. 

If you have a liquid fertilizer, some formulas are for every time you water your plants. Others will recommend you to water your plants every other time or once to twice per month. 

For granular fertilizers, these are more frequent than the liquid-type. These release nutrients to your soil immediately, which plants absorb quickly, too. 

If you’re using pods, spikes, or slow-release fertilizers, it’s best to follow the directions in the package. These are long-lasting, which can take up to two months, and it depends on your plant’s size. 

Best Indoor Plants to Grow for Beginners

If you’re starting to fascinate indoor plants, here are some you can consider planting to make your room’s interior look more appealing. 

Jade Plant

This plant can retain water in its leaves, which lets it thrive for a month or more. You don’t have to give it a lot of attention, but it will grow healthily as long as you put it in a sunny area, like in your window. It’s best if it’s west-facing or south-facing. 


This plant is also one of the most picked indoor plants because it can withstand excessive water without compromising its health. It also comes in a spectrum of colors, including red, white, pink, and green. 


Another plant to add to your list is this plant, also called “devil’s ivy.” It can also withstand under-watering or overwatering, along with pitch-black conditions. 


It’s also one of the best plants indoors because it doesn’t need direct sunlight to thrive. All you need is to put it near your table or on your desk. When it comes to watering this plant, you can hydrate it weekly or every two weeks for best growth. 

Dragon Tree

This plant is an attractive indoor plant, yet it’s not very pet-friendly because of its corners. It needs a low-light corner, or you can place it on your windowsill. 


This plant blooms attractive flowers, yet it doesn’t require too much attention. It’s also water-retaining, and it can survive in dry weather or at variable temperatures. Plus, it can also withstand the winter weather. 

Phalaenopsis Orchid

This plant is not only for the outdoors. You can also plant it indoors, where it’s native to Asian countries. These need more humid weather and low light. When it comes to taking care of these, you need to water these weekly or a week and a half. 

ZZ Plant

This plant is from East Africa, and it’s famous as the “king of indestructible plants” because of its tolerance. It can survive in low light, drought soil, and low humidity. Aside from that, it makes an exceptional interior design too. 


This plant is famous as the “umbrella tree.” It also makes an exceptional display in your house. If you plant it outdoors, it can grow up to 15 feet, yet it will grow slowly indoors. However, the downside is that it can be mildly lethal for your pets. 

How to Take Good Care of Your Indoor Plants

Indoor plants will not consume too much of your time, but it’s always important to take good care of these. Here are ways on how to take good care of your plants:

  • Always put your plant in a spot where it can get light. Regardless if it’s artificial or natural, a light source will help your plant survive and grow healthily, unless the plant doesn’t live well with sunlight. 
  • Know your plant’s specie, so you know what it needs. It’s how you can take care of it well. 
  • Put your plant in pots with drainage holes at the bottom. 
  • Always keep the soil in your pots moist. Make sure it’s not too dry, and it’s also not very wet. 
  • Prune your plants if you notice that these are getting spindly and tall. It’s the most recommended way. If you don’t need to prune your plant, don’t do it.
  • Don’t neglect your plants. Even though these are not high maintenance, you should still give these the right attention needed. 

How to Prevent Over-watering Your Indoor Plants

Since over-watering is one of the biggest mistakes of gardeners, there are hacks in determining when the right time is. 

  • You can use a moisture meter because it’s an accurate way to know when your soil is dry already. 
  • Use a soil probe to draw your soil out. It will let you understand how dry your soil is. 
  • Wilting occurs when your plant is not having enough water. If you lift your plant, and it’s light, it’s time to water it. If your plant is heavy, it still has sufficient water. 
  • Lastly, yellow leaves are obvious indicators that your plant needs water.  

How to Get Rid of Bugs on Your Indoor Plants

Even when these are growing indoors, you will still encounter bugs or pests, which is more annoying because it’s inside your house. The solution is to buy an insecticidal soap, which are in spray bottles. 

As you use this soap, you can spray it entirely on your plant, from stems to the undersides and tops of your plant’s leaves. After spraying, wait for two weeks before you spray it again. Plus, it’s best to spray it three times to kill eggs. However, if there are too many and you can’t remove these pests anymore, it’s best to disregard your plant and buy a replacement instead. 

Another option is that you can bring it to a garden center. Professionals may be able to address your pest-issues without the need to disregard your plant. 


Indoor plants make an exceptional design at home or in the office. If you don’t have enough time to plant in your backyard, you can start with these plants. It’s as if you’re planting in a smaller garden while making it a decoration inside rooms. Plus, it’s not very hassling to grow indoor plants, yet you still need to spend some time taking good care of these. One way is by applying the right amount of fertilizers to help it grow healthily. 

Even though growing indoor plants doesn’t require too much work, it’s still crucial to apply fertilizers because these need more nutrients. The Indoor Plant Food Spikes by Miracle-Gro is the best option you can consider because it’s not too hassling to apply, yet it gives N-P-K the best formulation for a more desirable plant-development. 

FAQs (Frequently Asked Questions) 

Will my plant live longer than five years if I continue to put fertilizers?

Using fertilizers doesn’t promote a longer life for plants, but a healthier growth. The average life of indoor plants is 2 to 5 years. After five years, most plants will stop growing, and when these stop, it’s time to buy new plants. 

Are indoor plants beneficial inside the home?

Yes, these are. These are not only exceptional decorations. These can also reduce stress and noise levels, which we need at home or in the office. 

Why do some indoor plants die?

Most reasons why indoor plants don’t thrive include not having enough light source, under-watering, or over-watering. 

Can I dissolve spikes in water instead as I apply it into my soil?

It’s best if you can insert spike fertilizers instead of dissolving these because the purpose why there are spikes is to give you a hassle-free time in fertilizing. If you want to dissolve a fertilizer in water, look for liquid or powdered ones.

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