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Top 10 Indoor Plant Fertilizers for Thriving Houseplants

Discover the top 10 indoor plant fertilizers for lush, healthy houseplants, including organic options and application tips for vibrant growth.

Are your indoor plants looking lifeless, or are they turning yellow or dying? These are indications of several things, from nutrient deficiency to pest infestation and much more. But usually, it is found that the lack of one or more nutrients makes the plants lose their vigor or shine. An easy way to add more healthy months or years to their lives is an instant dose of the right fertilizer that they need. 

But which fertilizer should you use, and how much should you use it? Keep your worries aside, as we have compiled a comprehensive article on some of the top indoor plant fertilizers for your houseplants. We have also included an application rate to help you. 

Top 10 indoor plant fertilizers for happy and healthy indoor plants 

Your houseplants will thank you if you use one or more of the following 10 fertilizers on them as and when they need it.

HANS Magnesium Sulfate Fertilizer

Magnesium Sulphate Fertilizer

Magnesium sulfate fertilizer, also known as Epsom salt, is another top indoor fertilizer. It is recommended that you choose magnesium sulfate fertilizer produced by HANS. It contains two important nutrients, magnesium, and sulfur, and both are beneficial for plants. Plants need both these nutrients for healthy growth as well as flowering or fruiting. Epsom salts also help with chlorophyll production in indoor plants.

It does not cause salt buildup if you use it occasionally to improve the health of your plants. So, take two tablespoons of Epsom salt and add it to a gallon of water. Use it as a foliar fertilizer and add surfactant to it, though, to ensure it stays for long. 

Apply every three months or so, and you will be good to go.

Espoma Organic Indoor Houseplant 

Espoma Organic Indoor Houseplant

The first fertilizer on our list is Espoma Organic Indoor Houseplant. It is an NPK fertilizer that can be applied easily to plants. The NPK ratio is 2-2-2. 

All you need to do is take 1 quart of water and then add to it 2 tablespoons of the fertilizer. Now, add this liquid fertilizer to the soil for the microbes to act on them and provide food to the plant. 

In the liquid state, these nutrients are readily available for uptake by the plants. Also, the plant receives consistent nutrient content as each drop contains the same amount of fertilizer. 

Furthermore, the results can be seen faster as compared to when the plants are fed with other granular fertilizers. The quantity – 8 ounces is a downside, but it needs to be applied frequently to receive the desired results. Apply it at a gap of 2-4 weeks

Miracle-Gro All-Purpose Plant Food

Miracle Gro All Purpose Plant Food

This is a synthetic fertilizer for the houseplants. The NPK value is higher as compared to Epsoma and thus proves to be more useful for plant growth. To be precise, NPK is in the ratio 24-8-16. 

Although it is a good fertilizer for most houseplants, it is suggested not to use it for flowering plants as the phosphorus content is low. Other than that, you can use it on all types of plants, such as roses, flowers, trees, vegetables, and shrubs. 

It is best to apply it at a gap of 1-2 weeks and in the growing season. Remember to apply it in the recommended quantity, or you risk burning the plant. 

Bloom City Fertilizer Supplement

Bloom City Fertilizer Supplement

When looking for a natural fertilizer, there is no other fertilizer better than Bloom City Fertilizer Supplement. On the one hand, it is loaded with liquid seaweed, while on the other, it has kelp. 

Both these natural ingredients make this fertilizer a great option.

With almost seven species of kelp in it, a few applications of the fertilizer will make the plant resilient enough to face environmental issues such as insects and diseases. To receive these benefits, combine 5 to 10 milliliters of the fertilizer with a gallon of water and then spray. 

The application rate is once or twice a month or when you water the plants. You can also apply it on the leaves. 

Osmocote’s Smart-Release Plant Food

Osmocotes Smart Release Plant Food

As the name suggests, this is a slow-release fertilizer. You can expect it to work even after three months of its application. The result of their application can be seen as early as after a month when new growth comes out. 

What happens is that each particle of the fertilizer is covered with a resin that helps the plant absorb nutrients better. This coating reacts to temperature changes. So, during the growing season, when the plant needs nutrients the most, it gets them at just the right time.

Earth All-Purpose Fertilizer

Earth All Purpose Fertilizer

This one is perfect if you aren’t looking to buy two different fertilizers – one for indoor plants and another for outdoor plants. This all-purpose fertilizer is organic and can be applied without fearing damage to the soil quality. It has an alfalfa meal, fish bone meal, kelp meal, fish meal, and potassium sulfate in it.

When pampering your houseplants, take two tablespoons of the fertilizer and add it to a gallon of soil. You can also add the granular fertilizer to the soil when planting. This is an NPK fertilizer and will deliver a balanced amount of nutrients, i.e., 4% N, 6% P, and 5% K.  

Jobe’s Organics Plant Food for Herbs

Jobes Organics Plant Food for Herbs

If you are growing herbs, then an organic fertilizer like Jobe’s Organics Plant Food for Herbs is what you need. As we know, the nutrient requirement of herbs is lower than other plants. 

Therefore, a granular fertilizer like this with NPK value 2-5-3 is just what you should settle for. 

The high phosphorus content helps produce more green foliage, something you look for in a herb. Not only this, it contains a mixture of mycorrhizal fungi and bacteria that help break down nutrients in the soil, making it healthier in return.

All you need to do is to apply this fertilizer every 3-6 weeks. However, do not overapply; read the manufacturer’s instructions first.

The Grow Co Succulent & Cacti Plant Food

The Grow Co Succulent Cacti Plant Food

Here’s one for the succulent babies. It is a gentle fertilizer that gets activated only when you water the succulents, which we know is occasional. This also makes this fertilizer low maintenance, and it will last almost nine months. 

The two main ingredients include urea and magnesium. While urea in small amounts helps with healthy foliage without harming the roots, the magnesium makes sure your succulent looks bright and shiny.

For application, you can scatter the fertilizer onto the surface of the soil. Then, mix some topsoil lightly. 

EarthPods Fertilizer Spikes

EarthPods Fertilizer Spikes

For indoor flowering needs, you need an additive that works its way easily and provides you with blooms without much hassle. EarthPods fertilizer spikes can fulfill your requirements. It is an organic fertilizer. Even the packaging is eco-friendly, made of recycled paperboard, and printed with soy ink. 

Just take one capsule of Earthpod and lay it in the soil near the roots. Now water the plant. 

As the earth pods disintegrate over some time, they release nutrients into the soil. Alternatively, you can use it as a liquid fertilizer. Just take one or two capsules and dissolve them in lukewarm water for quick dissolution. 

For best results, you may have to reapply every 2-3 weeks. Small plants require one or two Earthpods, whereas the larger ones should be fed with 7-8. Earth Pods fertilizer are perfect for your houseplants, flowering bulbs, annual flowers, as well as flowering shrubs. 

Neptune’s Harvest Fish-Seaweed Blend Fertilizer

Neptunes Harvest Fish Seaweed Blend Fertilizer

OMRI-certified, you can trust this fertilizer for its adherence to the strict standards of the organization. Neptune’s fertilizer is prepared using organic and natural ingredients. The NPK value is 2-3-1, and the high phosphorus content is just right for your blooms.

What makes this fertilizer safe is the low macronutrient level. Even if you are a beginner, there is no way you can overfertilize the plant with such low concentration. But to get the desired results, follow the manufacturer’s instructions. Take the concentrate and mix it with water before applying it to your plants. 

Use it after every 2 weeks, and the results will be visible in a month. 

What to Consider Before Buying an Indoor Fertilizer

  • The NPK value: If your houseplants have more foliage, then buy an NPK fertilizer with a higher nitrogen value. However, for flowering plants, the phosphorus content should be higher. 
  • Presence of micronutrients: apart from the macronutrients, your plants need micronutrients such as calcium and magnesium as well. Make sure your fertilizer contains it.
  • Water-soluble fertilizer: Is the fertilizer soluble in water or not? This is important as liquid fertilizers produce faster results than granular ones.
  • Slow-release fertilizers: these are a preferred choice for small pots. Spikes, capsules, and pods work better as they release nutrients slowly into the soil. An added advantage is that you don’t have to remind yourself to fertilize. 

Parting thoughts

With this, we conclude our list of the top 10 indoor plant fertilizers for your houseplants and what to consider before buying any of them. Just make sure to understand the needs of your plants and then go ahead with one of them. Also, it is important to check the reputation of the fertilizer manufacturer; don’t forget to do that. 

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