Top 15 Best Fertilizers for Indoor Plants

by Christina Lopez

Indoor plants need fertilizers to supply essential nutrients to thrive. The best fertilizers for indoor plants should contain all the nutrients necessary for lush foliage, a healthy root system, and beautiful flowers. There are various fertilizers for indoor plants, such as granular, liquid fertilizers, and slow releasing.

You should choose the kind of fertilizer that supplies balanced minerals, micronutrients, and macronutrients to your plant. This article reviews the best 15 fertilizers for houseplants and factors to consider when choosing.

15 Best Fertilizers for Indoor Plants Reviews

15 Best Fertilizers for Indoor Plants Reviews
15 Best Fertilizers for Indoor Plants Reviews

1. Purived all-purpose Liquid Fertilizers for Indoor Plants

Purived Liquid Fertilizer For Indoor Plants | 20oz Concentrate | Makes 50 Gallons | All-Purpose Liquid Plant Food For Potted Houseplants | All-Natural | Groundwater Safe | Easy To Use | Made In USA
Purived Liquid Fertilizer For Indoor Plants | 20oz Concentrate | Makes 50 Gallons | All-Purpose Liquid Plant Food For Potted Houseplants | All-Natural | Groundwater Safe | Easy To Use | Made In USA

Surprisingly Purived is a very new fertilizer in the market, but its high-quality standards have surpassed even the types that have been in the market for decades. The fertilizer is super concentrated and works with all plants both indoors and outdoors. You will agree that it is designed odorless and easy to use.

Before application, you mix a 20oz bottle to 50gallons of water, then apply as directed to achieve an immediate response. Whether you have cultivated flowering houseplants, succulents, edibles, vegetables, etc., there is no limit to the kind of plants to use with. This fertilizer contains both macronutrients that are NPK and micronutrients. You can trust Purived as the best fertilizer for plants and flowers since the brand offers a 100 money-back satisfaction guarantee.

Pros
  • Supports all indoor and outdoor plants
  • The brand allows a money-back guarantee
  • Shows instant response after application
  • Stimulates chlorophyll production
  • Ease of use, add 20oz to 50 gals of water
Cons
  • No cons reported so far

2. Miracle-Gro 8-Ounce 2 Pack liquid fertilizers for Indoor Plants

Miracle-Gro Indoor Plant Food, 8-Ounce (Plant Fertilizer) (2 Pack)
Miracle-Gro Indoor Plant Food, 8-Ounce (Plant Fertilizer) (2 Pack)

Miracle-Gro is an 8-ounce fertilizer that comes in a ready-to-use formula, and you apply directly to the soil from the bottle. You can apply the fertilizer as top dressing once a week to all your houseplants whether, flowers, succulents, or edibles. The manufacturer avails the fertilizer in 2 pack option; hence you get more at a reasonable price.

If you want liquid fertilizer for plants that support your indoor plants without burning, then this is precisely the deal. While keeping indoor plants, including those on grow tents, also boosts outdoor vegetables. It contains all valuable micro and macronutrients in a suitable ratio to help the plants grow fast and stable.

Pros
  • Soluble for an instant boost to plants
  • Easy to use application weekly or biweekly
  • Works for all houseplants; flowers, shrubs, and edibles
  • Safe and cannot urn the plants if used as directed
Cons
  • Customer support is not very responsive

3. Aquatic Arts All-purpose House Plant Fertilizers

Indoor Plant Food | All-purpose House Plant Fertilizer | Liquid Common Houseplant Fertilizers For Potted Planting Soil | By Aquatic Arts
Indoor Plant Food | All-purpose House Plant Fertilizer | Liquid Common Houseplant Fertilizers For Potted Planting Soil | By Aquatic Arts

This is consumers' best choice of all-purpose liquid fertilizers for house plants, whether potted or not. Top rating on amazon and positive consumer reviews will give you the confidence of how effective the fertilizer is. As far as promoting the plants' growth is concerned, aquatic arts fertilizer is better than pellets or granules. Applicable to plants in pots, hangers, and holders, the fertilizers contain essential elements like phosphorus, nitrogen, and other vitamins boosting your plant up to a year.

You do not have to worry about how you will apply the fertilizer. All you do is mix one teaspoon to two cups of water, and the cup is provided. You use the fertilizer to your plant before watering. Aquatic arts manufacturers the best fertilizer for potted plants that encourages healthy growth of the stem, leaves, and roots hence reliable.

Pros
  • Enhance leaves, stem, and roots growth
  • Help reduces brown spots and yellowish on leaves.
  • Ideal for all house plants, including potted
  • Easy application process
  • Long-lasting effect up to 1 year
Cons
  • Can burn leaves if applied directly to them

4. Organic Plant Food and Fertilizer by Joyful Dirt

Joyful Dirt Premium Concentrated All Purpose Organic Plant Food And Fertilizer. Easy Use Shaker (3 Oz)
Joyful Dirt Premium Concentrated All Purpose Organic Plant Food And Fertilizer. Easy Use Shaker (3 Oz)

Joyful dirt brings happiness to the gardeners. Just as the name suggests, it is the best organic plant fertilizer for indoor plants you can trust. Safety is everything, and this fertilizer is the health ambassador. For these reasons, you can use it around pets and children while it does not cause chemical burns on plants. There is no risk of using the fertilizer at home and no potential chemical harm associated with it.

Manufactured in powder form, you can choose to sprinkle around the plant base before watering or dissolve a tablespoon in 0.5 gals of water. Fertilizer has composition of 8% nitrogen, potassium 5% and 1% phosphorus. This fertilizer contains fungi mycorrhizae which forms a symbiotic relationship with your plants where the fungi accelerate nutrient absorption.

Pros
  • Using is very easy
  • Help prevent chemical burns.
  • Feature organics elements safe near pets and children
  • It comes with useful fungi
Cons
  • A bit expensive than some alternative options
  • Low phosphorus concentration

5. MARPHYL All Natural Marine Phytoplankton Fertilizer

MARPHYL Organic Liquid Soil Enhancer/Fertilizer With All Natural Marine Phytoplankton, 16.9 Fl. Oz (3 Sizes)
MARPHYL Organic Liquid Soil Enhancer/Fertilizer With All Natural Marine Phytoplankton, 16.9 Fl. Oz (3 Sizes)

Want multi-nutrient liquid soil enhancer? Well, MARPHYL organic fertilizer is the option that guarantees that your plants get sufficient minerals, vitamins, and other nutrients from marine life. All these nutrition elements enhance the health of houseplants and outdoor container plants.

The fertilizer produces a particular smell of 100%, alright since it is organic and natural. The smell results from ammonia that changes to sulfur/nitrogen and is suitable for plants' health. Marine phytoplankton is the element making the enhancer the best fertilizer for acid-loving plants and others. The potassium in the fertilizer facilitates the circulation of oxygen and other nutrients essential for photosynthesis.

Pros
  • Manufactured natural nontoxic and no preservatives
  • Replenishes the soil boosting nutrient absorption
  • Supports plants health while safe to the environment
  • Approved by OMRI as safe and non-GMO
Cons
  • Allergic people are affected it urea smell

6. Osmocote Plant Food

Osmocote Smart-Release Plant Food Plus Outdoor & Indoor, 1 Lb
Osmocote Smart-Release Plant Food Plus Outdoor & Indoor, 1 Lb

There are 11 critical nutrients incorporated in Osmocote Smart Release, hence one of the best liquid fertilizers for indoor plants. However, it still can work with any plant or herb, both indoor and outdoor. Something unique about this fertilizer option is that it constantly feeds the plants for up to 6 months, whereas others may need reapplication after some weeks.

Application is easy and only blends with the given volume to realize the best results without any trouble. All the fertilizers' granules are coated with resin which is semi-permeable to protect the user from contact while applying. Once dropped on the soil then water is added, the granules dissolve, and the nutrients are readily absorbed. Release nutrients with change in temperatures smartly when plants are actively growing.

Pros
  • The formula contains 11 essential nutrients.
  • Works with almost all plants varieties, growing conditions
  • Supports the plant for six months
  • Does not burn the plant when used properly
Cons
  • Application in excess can harm the plants

7. Easy Peasy Plants All-Purpose Indoor Plant Fertilizers

Liquid Indoor Plant Food, All-Purpose Indoor Plant Fertilizer, Liquid Plant Food, Easy Peasy Plants House Plant Fertilizers 4-3-4 Plant Nutrients, House Plant Food | Lasts Same As 8 Oz Bottle
Liquid Indoor Plant Food, All-Purpose Indoor Plant Fertilizer, Liquid Plant Food, Easy Peasy Plants House Plant Fertilizers 4-3-4 Plant Nutrients, House Plant Food | Lasts Same As 8 Oz Bottle

There is no artificial flower that can ever compel the beauty of healthy live plants. Therefore, Easy Peasy liquid fertilizers make indoor plants fresh and fleshy to decorate offices, apartments, bathrooms, and other residential areas. This fertilizer contains a long-lasting NPK in the ratio of 4-2-4, hence the best choice for customers in need of fertilizers for flowering plants. The valuable nutrient formula is spiked with sulfur boosting indoor plants to grow large and tall.

Wait.. the fertilizer comes in an 8 oz bottle, but due to its high concentration, the performance is equivalent to a 16 oz bottle. Application is easy; you only add half a teaspoon of the liquid fertilizer into 2 cups of water for your regular watering routine.

Pros
  • Multipurpose option for indoor growers
  • High concentrated hence economical
  • Sufficient nitrogen to boost leaves
  • Eco-friendly help reduce plastic bottles by 50%
Cons
  • Direct contact with leaves causes burns

8. Miracle-Gro 3 lb All Purpose Plant Food

Miracle-Gro Water Soluble All Purpose Plant Food, 3 Lb
Miracle-Gro Water Soluble All Purpose Plant Food, 3 Lb

Having over 4.7 ratings out of possible five stars after over 40k reviews on amazon is not a joke. It is the best fertilizer for container plants and consumers' top choice. The brand concentrates on quality, listens to consumer opinions, and acts accordingly. Moreover, Miracle-Gro All Purpose Fertilizer is affordable and meant for various uses. You dissolve in water as directed and use it to boost vegetables, herbs, houseplants, and more.

The consumer is guaranteed that it will not burn the plants if application directives are followed correctly, but instead, crops will grow healthier. The fertilizer contains an NPK effective ratio of 24-8-16 and works ideally irrespective of the time you apply.

Pros
  • 3 lb quantity is sufficient for houseplants
  • It contains essential nutrients the plant needs.
  • Versatile for all plants, houseplants, trees, vegetables, etc.
  • Safe for all plants if used as directed
Cons
  • Needs following careful guidelines or harm the plants

9. Osmocote Flower & Vegetable Food

Osmocote Smart-Release Plant Food Flower & Vegetable, 8 Lb
Osmocote Smart-Release Plant Food Flower & Vegetable, 8 Lb

Osmocote smart release has been tested and now users' best choice. It ensures a continuous supply of essential nutrients to the plant for not less than four months. When introduced to water, the semi-permeable resin-coated granules dissolve in water, releasing the nutrients gradually.

The term 'smart release' shows an attribute where the fertilizer releases nutrients in warm weather but is absorbed during active growth periods. This formula credits the extensive research the brands have taken to ensure they manufacture what serves the consumer best. The primary intent is to guarantee that plants receive nutrients when both the top and root systems are ready for perfect growth. Thus, it is the best winter fertilizer for indoor plants to control when nutrient absorption occurs.

Pros
  • Releases nutrients smartly when needed most
  • Semi-permeable resin coating preserves nutrients.
  • Wide uses; houseplants, herbs, trees, and vegetables
  • Supports the plants for up to 4 months
Cons
  • Left shell after nutrients dissolves spoils the appearance.

10. Harris 3-3-0.3 Organic Indoor Plant Fertilizers

Harris Organic Plant And Lawn Fertilizer, Hydrolyzed Liquid Fish Fertilizer Emulsion Great For Tomatoes And Vegetables, 3-3-0.3, 32oz (32oz (Quart))
Harris Organic Plant And Lawn Fertilizer, Hydrolyzed Liquid Fish Fertilizer Emulsion Great For Tomatoes And Vegetables, 3-3-0.3, 32oz (32oz (Quart))

One factor that draws new users while maintaining enthusiast is that the fertilizer emulsion contains hydrolyzed liquid fish. This encourages tomatoes and vegetables' performance-fish sources minerals and micronutrients that boost the root system's growth.

Fish fertilizers for plants rebuild the soil, increase yield, and enhance indoor and outdoor plants' growth. The fertilizer is versatile, and you can apply it to your plants using various methods such as foliar applied, soil-applied, or using a drip system. It is organic hence facilitates microbial activity, enhances soil health, and cannot burn the plant.

Pros
  • Organic fertilizers cannot burn the plants.
  • Versatile hence ideal for indoor and outdoor application
  • Unique as it uses an enzymatic cold-press process
  • Features essential minerals and micronutrients from fish
Cons
  • Performance is not instant

11. ECO Home & Garden Indoor Plant Fertilizers

Eco Home & Garden Indoor Plant Fertilizer | Organic Indoor Plant Food Made From Liquid Kelp Seaweed Extract | Great Vegetable Liquid Fertilizer & House Plant Fertilizer Indoor (1 Liter)
Eco Home & Garden Indoor Plant Fertilizer | Organic Indoor Plant Food Made From Liquid Kelp Seaweed Extract | Great Vegetable Liquid Fertilizer & House Plant Fertilizer Indoor (1 Liter)

Ultimately, here comes organic fertilizer from ECO GARDEN PRO PROFESSIONAL with adjusted soil pH. For this reason, you do not have to adjust the soil acidity or alkalinity since the fertilizer rectifies such issues. It makes your house plants thrive irrespective of the types from succulents, bonsai, palm trees, and others in general.

The plant features micro-nutrients and macro-plant nutrients for all your indoor plants and further ensures balanced npk. Since this natural fertilizer for plants is highly concentrated, it can support your houseplants for a more extended period and sufficient in small quantities. The manufacturer offers a 100% money-back guarantee if dissatisfied.

Pros
  • Manufacturer customer to return and get money back if dissatisfied
  • Features balanced pH level; hence no acidity burns
  • Ideal fertilizer for vegetable, fruits, and herbs
  • Organic from marine kelp, thus safe
Cons
  • Costly compared to close alternative

12. Lilly Miller Alaska Fish Fertilizers for Indoor Plants

Lilly Miller Alaska Fish Fertilizer 5-1-1 Concentrate 1 Quart (2-Pack)
Lilly Miller Alaska Fish Fertilizer 5-1-1 Concentrate 1 Quart (2-Pack)

If you mean good to your garden, indoor potting mixes, and other places you put your house plants, be hesitant when using artificial fertilizers. Lilly Miller Alaska Fish Fertilizer has not been with us for a long time, but growers have received it affectionately since it's an organic option. With a concentration ratio of 5-1-1, this fertilizer features all organic nutrients indoor and outdoor plants wood needs.

Although calcium fertilizer for plants also features organic factors from fish, it supports all plants with macronutrients and micronutrients. You can use it as directed by the manufacturer. However, in case of a mistake over the application, it cannot hurt the plants.

Pros
  • Total organic thus safe for plants
  • Works in all plants indoor and outdoor
  • Retails at reasonable to consumers
  • Concentrated fish fertilizer guaranteeing a strong root system
Cons
  • Not eco-friendly should have used 1 plastic bottle instead of 2

13. Perfect Plants All-Purpose Liquid Fertilizers

Perfect Plants Liquid Indoor Plant Food | 8oz. Of Concentrated All-Purpose Fertilizer | Use With All Varieties Of Houseplants
Perfect Plants Liquid Indoor Plant Food | 8oz. Of Concentrated All-Purpose Fertilizer | Use With All Varieties Of Houseplants

Once perfect plant liquid fertilizer is applied, it immediately responds by facilitating the root nourishment and healthy foliage. It is the best fertilizer for indoor plants and can be incorporated into the plants during regular watering. The fertilizer supports all houseplants from flowering, perennials, and others by helping them achieve optimal yield.

One super attribute of perfect plant fertilizer is its high penetration rate, giving an instant boost to your herbs and vegetables. It contains three essential elements nitrogen, phosphate, and potassium. Where phosphate facilitates nutrient conversion, nitrogen aids in building chlorophyll for photosynthesis, and potassium ensures strong roots.

Pros
  • Facilitates the formation of strong roots and lessen foliage wilting
  • Sold in resealable bottle for storage purposes
  • Highly concentrated thus sufficient in small quantity
  • Vibrant facilitates growth color and taste
Cons
  • No smart release; hence poorly performs during fall and winter.

14. EON NATURAL Indoor Plant Fertilizers

EON NATURAL Indoor Plant Food - 8 Oz Organic Indoor Plant Fertilizer - Premium All-Purpose Liquid Plant Food With Nitrogen, Phosphorus, And Potassium - Natural Fertilizer For Indoor Houseplants
EON NATURAL Indoor Plant Food - 8 Oz Organic Indoor Plant Fertilizer - Premium All-Purpose Liquid Plant Food With Nitrogen, Phosphorus, And Potassium - Natural Fertilizer For Indoor Houseplants

There is no better perfection than quality portrayed in the manufacture of EON NATURAL organic liquid fertilizer. They blend npk elements in the ratio of 3-1-2 and micronutrients helping your plant to thrive. Better than pellets and other artificial fertilizers, this one offers long-lasting sustainability. A single 8oz bottle only can support your plants for a year.

If you need the best fertilizer for spider plants, look no further, EON is the solution. It works for all indoor plants, orchids, succulents, fig trees, rubber plants, aloe vera, etc. You can always use fertilizer whenever boosting plant growth is necessary. Using is just a breeze; you mix one teaspoon with 2 cups while doing regular watering.

Pros
  • Using is easy and stress-free
  • Offer a multipurpose solution to all potted plants
  • Long-lasting and sufficient in small quantities
  • All-natural and organic hence safe on the plants
Cons
  • Mostly out of stock

15. Arum 2.2 fl oz All-Purpose Indoor Plant Fertilizers

Arum Premium All-Purpose Indoor Plant Fertilizer, Concentrated Liquid Plant Food, Boosts Root, Leaf And Bloom Growth, Lasts As Long As Many 8 Oz Bottles, Made In The USA.
Arum Premium All-Purpose Indoor Plant Fertilizer, Concentrated Liquid Plant Food, Boosts Root, Leaf And Bloom Growth, Lasts As Long As Many 8 Oz Bottles, Made In The USA.

Arum All Purpose Plant Fertilizer is one of the most concentrated fertilizers available, with up to 4 times more vigorous than other alternatives available. It promotes the newborn stage hence the best fertilizer for flowering plants and enhances the overall growth. The fertilizer features essential nutrients, vitamins, minerals, and amino that encourages beautiful flowering and overall health.

Even though the fertilizer is mainly meant for indoor plants, it works great for outdoor plants. This fertilizer nourishes the plant ideally where there is sunlight or sunlike grow light and some moisture. Incorporating USA-made ARUM fertilizers into your plant's maintenance regime is a tremendous step to a high yield gardening.

Pros
  • High concentration better performance
  • Multipurpose fertilizer for all indoor plants
  • Encourage budding and overall growth
  • Easy to use fertilizer
Cons
  • Requires warmth and moistures hence not efficient during fall and winter

Best Combinations

Bundle of Potting Soil -Leaf Shine & Indoor Plant Food

Miracle-Gro Indoor Potting Mix, Indoor Plant Food & Leaf Shine - Bundle Of Potting Soil (6 Qt.), Liquid Plant Food (8 Oz.) & Leaf Shine (8 Oz.) For Growing, Fertilizing & Cleaning Houseplants
Miracle-Gro Indoor Potting Mix, Indoor Plant Food & Leaf Shine - Bundle Of Potting Soil (6 Qt.), Liquid Plant Food (8 Oz.) & Leaf Shine (8 Oz.) For Growing, Fertilizing & Cleaning Houseplants

Miracle-Glo is the mixture of the best plant food. The three main varieties, inclusive; liquid plant food at 8oz, leaf shine at 8oz, and a bundle of potting soil at 6oz, make the emulsion priceless. Rating and reviews from the users are sure to prove that the soil mix is uncompelled. The nutritional content and fertility are sufficient to feed the plant for up to 6 months.

The soil is designed resistant to common pests and fungus. Since the soil includes coconut coir, there is a guarantee of proper drainage yet holds average water to sustain the growth. It helps hard-leafed plants to shine without clogging the leaf pores.

Best Fertilizers for Indoor Plants Buying Guide

Indoor Plant Fertilizers Buying Guide
Indoor Plant Fertilizers Buying Guide

When choosing the best way to fertilize your indoor plants, there are several factors to look at. The following are different fertilizers types to choose and it is up to you to make the right decision.

Liquid fertilizers

These fertilizers are applied while watering as directed whether, weekly, biweekly or monthly. You have vast leverage on how much to use. When the plants are not actively growing in winter or fall, you should ensure no fertilizer is released. Always be careful about the quantity you mix with water when fertilizing the soil. Some liquid fertilizers should not contact leaves, especially synthetic ones, as they could cause burning.

Slow-release fertilizers

They are sometimes referred to as intelligent release fertilizers. These fertilizers are reliable as they do not cause plant burns. They release plants nutrients in a controlled manner, depending on the soil temperature at the moment. The manufacturer designs the fertilizer to follow the predictable rate while releasing nutrients slowly, influenced by soil pH, weather, or moisture. It is the best fertilizer for potted plants, and you don't have to keep remembering when to apply.

Organic fertilizers

Organic fertilizers are harmless as they are prepared from living organisms ad their bi-products. They are purely natural and harmless. You can apply with bare hands or using the spreader. Moreover, the microorganism breaks down slowly, releasing nitrogen. Organic fertilizers rebuild the soil composition, enhances density and texture. However, some people are uncomfortably using organic fertilizers due to their foul smell.

Granular fertilizers

These fertilizers are very common and prevalent among gardeners due to their simplistic mode of application. They come in bags, simple to apply, and are stored for a very long time without worrying about expiry. They are available in two options that are; slow release and faster release. The slow-release may take between 2 and 6 months, while the quick-release is absorbed into the roots system immediately you apply. Slow-release works great even during cold weather costs less and should be used in the right amount to avoid possible plant burns.

Conclusion

Getting the best fertilizers for indoor plants is very easy. However, before getting to the market, you should research much about your plant, when, and apply fertilizer. If you feel there are chances you may not remember to fertilize or not sure about the quantity, go for slow release. The fertilizer will give your plants time to digest the nutrients.

Always follow the application guideline provided by the manufacturer. Never overlook consumer reviews as they reflect what exactly happens on the ground. Finally, if you are after the easiest to apply fertilizer, consider the granular option.

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About Christina Lopez

Christina Lopez grew up in the beautiful city of Mountain View, California, where she spent eighteen ascetic years as a vegetarian before stumbling upon the exquisite delicacy of a strange chicken thigh. She’s been a city finalist competitive pingpong player, an ocean diver, an ex-pat in England and Japan, and a computer science doctoral student. Christina writes really late at night as spending most of her daytime enchanting her magical herb garden.

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