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10 Best Fertilizers for Indoor Herbs

Have your houseplants withered or stunted growth as if they are only for some days? If it is true, you must check the previous feeding dose.

Generally, there are several fertilizers for indoor herbs, including granular, liquid, organic, homemade, and slow-release. Keep in mind not to deplete the soil quality while fertilizing the herbs with overfertilization in mind, as their fertilizer need is different than other garden crops and houseplants.

It is always a cautious job to feed sick plants, so read this article completely. 

Types of Fertilizer For Indoor Herbs

Chemical composition, nutrient availability, and product shape are the three key features distinguishing fertilizers.

Depending on the origin, they can be granular or liquid, slow-release or quick-release.

1. Granular Fertilizer

Dry slow-release fertilizers in granules or tiny lumps are offered as granular fertilizers.

These fertilizers take longer to break down in the soil due to their granular form, requiring more time for your herbs to absorb.

Dry fertilizers are another name for granular fertilizers.

2. Liquid Fertilizer

Liquid fertilizers are accessible in liquid form and act swiftly. It can be applied to the soil directly or mixed with filtered water.

Indoor herbs readily absorb liquid fertilizers and do so in a short period.

Liquid fertilizers are not great for herbs as they can be absorbed quickly. They do not last long as granular fertilizers.

3. Seaweed and Fish Emulsions

Seaweed-based fertilizer is a rich source of minerals, nitrogen, and vitamins, aided with growth hormones, and is less stinky than Fishmeal.

While Fish emulsions are completely decomposed natural sources of nitrogen with other trace nutrients required for growth.

When combined, you can use them for foliar spray or dilute them and apply them directly to the soil, although they are slow releasers.

4. Compost and Manure

Compost prepared from plant residues and Manure from grazing animals is a slow-releasing fertilizer solely from organic origin.

The fertilizer also includes worm casting, which is highly nutritious and filled with iron, magnesium, and nitrogen for indoor herbs with high porosity.

Synthetic Vs. Organic Fertilizer: For Indoor Herbs

Every fertilizer you use falls under the two major categories of Synthetic and Organic, depending on their source of origin.

Synthetic FertilizerOrganic Fertilizer
Inorganic compounds synthesized from the industrial by-productsMaterials originated from plant and animal by-products
Immediate effect to the plant but can kill helpful bacteriaEnhance soil texture by holding water and helpful bacteria for longer period
High chances of overfertilization due to salt accumulationLow or no chances of overfertilization as they have low level of nutrients

Homemade Fertilizer for Indoor Herbs

One of the most preferred fertilizers is homemade for indoor herbs as you can easily prepare from the by-products of plants and foods and are usually organic.

The indoor herbs are light feeders, so feeding them with slow releases ensures that they are not overfertilized and not deprived of nutrients at the same time.

Some of the DIY homemade fertilizers are as follows:

  • Banana Peels: Banana peels are a rich source of potassium. So instead of throwing them in a dustbin, you can dump them in the pots, cover them with soil, or mix them with water and use them as a liquid fertilizer.
  • Crushed Eggshell: You can use the eggshells by crushing them in mortar and pestle and spread over the top soil as they are a rich source of Calcium.
Best Fertilizers for Indoor Herbs
Eggshells can act as mulch and fertilizer and may increase soil porosity.
  • Coffee Grounds: Mixing the coffee grounds with soil before planting or spraying by diluting in water ensure the soil becomes acidic. It is best for herbs that love acidity.
  • Epsom Salt: Epsom salts are rich in magnesium and sulfur. So mix two tablespoons of Epsom salt with 1 gallon of water and spray over the soil monthly.
  • Weed Tea: Mix a pound of garden weed in every 8 cups of water and leaves it for 24 hours. Afterward, remove the solid particle and use the liquid by diluting the tea and water to a 1:10 ratio. The mix will supplement the NPK requirement of the herbs.

10 Best Fertilizers for Potted Indoor Herbs

If you are short on time and cannot prepare homemade fertilizers, you can choose the available ones suitable for indoor herbs.

Here are the 10 Best Fertilizers for your Indoor Herbs:

FertilizersFeatures Product Image
Jobes Organics Herb Fertilizer2-7-4 NPK
Contains Phosphorus
Doesn't burn roots
Miracle-Gro Water Soluble Plant Food18-18-21 NPK
Includes Natural ingredients
ALL BIO - Organic Plant Food2-1-1 NPK
Ecologically safe
EcoScraps for Organic Gardening Herbs5-4-5 NPK
Climate friendly
Pepper and Herb Fertilizer 11-11-40 Powder11-11-40 NPK
Great for hydroponics
Dr. Earth Home Grown Tomato, Vegetable & Herb Liquid Fertilizer3-2-2 NPK
100% Sustainable Fertilizer
Created with recylced grocery produce, fish & meat
Neptune's Harvest Fish Fertilizer2-4-1 NPK
Contains micro and macro nutrients naturally found in fish
Miracle-Gro Nature's Care Organic & Natural Herb Plant Food6-3-9 NPK
High in calcium that herbs need to grow
Meghan's Garden All-Purpose Plant Food Fertilizer 100% organic and biodegradable
Down to Earth Organic Vegetable Garden Fertilizer 4-4-44-4-4 NPK
Ideal for use throughout the growing season.
Down to Earth Organic Vegetable Garden Fertilizer. (Source: Amazon)

1. Jobe’s Organics Herb Plant Food

Jobe’s Organics Herb Granular Fertilizer has a combination of beneficial microorganisms that improve soil quality by reestablishing a natural balance between plant and soil.

The fertilizer consists of bone and feather meal and composted chicken manure, potassium sulfate, and other components.

The ratio of NPK of this fertilizer is 2-5-3.

Product Specification

Item FormGranules
Target SpeciesHerbs & Spices
Item weight4 pounds
Where to Buy?Amazon, Walmart

2. Miracle-Go Water Soluble Plant Food

Miracle-Gro Water Soluble Plant Food uses natural components in its fertilizer. The plant food feeds your garden quickly and effortlessly.

One of the finest features of this fertilizer is that it does not burn when applied straight to the soil. It has an NPK ratio of 18-18-21.

In addition, Miracle-Gro is also a handy alternative for container-grown plants that require regular Fertilizers to replace nutrients leached through the soil.

Product Specification

Item FormGranules
Target SpeciesVegetables & Herbs
Item weight2 pounds
Where to Buy?Amazon, Walmart

3. ALL BIO-Herb Plant

The formula for All Bio Plant Nutrients aids in the growth of all components of herbal plants and is also climate-friendly, making it a sustainable approach.

The fertilizer also consists of Compounds extracted from organic plants (Arginine, Valine, Isoleucine, and Proline 5-15%).

In addition, with the usage of the product, you will notice a significant difference in the flavor and fragrance of the herbs.

Product Specification

Item FormPowder
Target SpeciesHerbs
Item weight10 grams
Where to Buy?Amazon

4. EcoScraps for Organic Gardening Herbs

Ecoscraps recycles food waste and repurposes it into organic, natural, and sustainable garden soils and plant food across the United States.

Organic gardening using Ecoscraps herbs & leafy green plant food is a one-of-a-kind particle containing all the nutrients needed to produce fresh herbs and leafy greens.

Aside from being a fertilizer, it is also a sustainable approach to better your gardening! It also has an NPK ratio of 5-4-5.

Product Specification

Item FormGranules
Target SpeciesHerbs & Leafy Vegetables
Item weight4 pounds
Where to Buy?Amazon, Walmart

5. Greenway Pepper & Herb Fertilizer

Greenway Pepper and Herb Fertilizer have the ideal balance of macronutrients and micronutrients for your pepper and herb.

This fertilizer contains copper, zinc, and manganese and has high nitrogen, phosphate, and potassium levels. It has an NPK ratio of 11-11-40.

In addition, this fertilizer is water-soluble and may be used in both hydroponic and potted plants. Not only that, no toxic metals or harmful materials are present in the fertilizer.

Product Specification

Item FormPowder
Target SpeciesHerbs, Pepper, & Hydroponics
Item weight2 pounds
Where to Buy?Amazon

6. Dr. Earth Home Grown Vegetable and Herbs Liquid Fertilizer

Home Grown Fertilizer provides nutrition to vegetable gardens, summer and winter crops, container plants, and natural backyard soil.

This sustainable fertilizer is made from recycled supermarket produce, fish, and meat. Similarly, the entire bottle consists of 3-2-2 NPK.

Likewise, it would be best to use it as a top dressing or compost tea during seed sowing, transplanting, and regularly.

Product Specification

Item FormPowder
Target SpeciesHerbs &Vegetables
Item weight1.9 pounds
Where to Buy?Amazon, Walmart

7. Neptune’s Harvest Fish Fertilizer

The Harvest of Neptune for organic farming is high in nitrogen, one of the most critical elements your plants require, with an NPK ratio of 2-4-1.

Similarly, the fish emulsion has no negative impact on your plants or soil. A unique cold technique protects vitamins, amino acids, enzymes, and growth hormones.

Neptune’s Harvest, unlike fish emulsions, preserves the fish proteins and oils and has no disagreeable odor.

Product Specification

Item FormLiquid
Target SpeciesHerbs, Vegetables, Trees, & Shrubs
Item weight0.14 gallon
Where to Buy?Amazon, Walmart

8. AgroThrive All-Purpose Organic Liquid Fertilizer

AgroThrive All Purpose Organic Liquid Fertilizer is 100% organic and will nourish and help your garden.

The fertilizer contains fish grain that boosts root and foliar growth and provides disease resistance by eliminating harmful pathogens.

Similarly, the N-P-K ratio of this organic product is 3-3-2, making it suitable for vegetables, lawns, greenhouses, and herbs.

Product Specification

Item FormLiquid
Target SpeciesHerbs, Vegetables, Lawns, and Greenhouses
Item weight1 gallon
Where to Buy?Amazon

9. Meghan’s Garden All-Purpose Plant Food

The Meghan’s Garden aspires to create high-quality, environmentally friendly organic goods to assist gardeners and plant enthusiasts.

The all-natural water-soluble plant fertilizer combination is packed with rich macronutrients and growth-promoting chemicals to make gardening as simple as possible.

Similarly, the combination is safe for children and pets because it is 100 percent organic and biodegradable.

Product Specification

Item FormPowder
Target SpeciesSucculents, Flowers, Herbs, Bonsai, & Vegetables
Item weight56.5 gram
Where to Buy?Amazon

10. Down to Earth Organic Vegetable Garden Fertilizer

Down To Earth’s Vegetable Garden, 4-4-4, is packed with potent plant nourishment to aid in the growth of your garden.

This vegetable fertilizer offers your spring greens a head start, gives your summer tomatoes super-powers, and is ideal for producing your favorite fragrant herbs.

For home garden fertilizer farms, this is a flexible blend. Similarly, the fertilizer is excellent for all growing seasons.

Product Specification

Item FormGranules
Target SpeciesHerbs, Tomatoes, & Spring Greens
Item weight5 pounds
Where to Buy?Amazon, Walmart

Managing Nutrient Needs in Container-Grown Herbs

Plants that grow in the ground have plenty of areas for their roots to spread out in quest of nutrition.

However, herbs cultivated in containers have significantly more limited roots, leading to over-fertilization if you’re not cautious.

As a result, it’s preferable to use a slow-release organic fertilizer or a half-strength solution of organic liquid fertilizer like fish emulsion, kelp, or compost tea to feed plants sparingly.

Thus, apply a liquid fertilizer every three to four weeks throughout the growing season or a slow-release organic fertilizer one to three times a year.

Tips on Fertilizing Indoor Herbs

  • Use compost instead of fast-acting fertilizers to top-dress your herbs.
  • You can apply fertilizer at one-quarter of the recommended rate given on the package, regardless of the variety you pick.
  • Use a well-draining pot for indoor herbs, as it is as essential as fertilizer in preventing overfertilization.
  • After potting herbs, wait 4-6 weeks before fertilizing. This allows the plant to use up the nutrients in the growth medium.
  • Not all herbs have the same need for fertilizers. Some slow-growing herbs need less fertilizer than fast-growing herbs.
  • Do not apply granular fertilizer if the soil is dry. The root system can get damaged.
  • If the roots are damaged, try repotting herbs in a new potting mix by mixing the fertilizer at the beginning.
  • To transport nutrients throughout the container, give them plenty of water.
  • Even when planted indoors, container-grown herbs do not require fertilizer in the winter.

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To Conclude

Most herbs do not require as many nutrients as blooming and fruiting indoor plants.

Choose a fertilizer based on the herb’s nature, as some prefer acidic soil while some thrive in nitrogen-rich soil. So, determine the need for herbs before applying fertilizer.

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