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7 Best Organic Liquid Fertilizers for Vegetables & Gardens in 2021

7 Best Organic Liquid Fertilizers for Vegetables & Gardens in 2021

Any good gardener wants to give their plants the very best nutrition in order to boost growth and production. Using the best organic liquid fertilizer for your vegetables and gardens provides a convenient, sustainable way of doing just that. 

Let’s take a dive into the world of fertilizers, full of nitrogen(N), phosphorus(P), potassium(K) and other nutrients tailored to exactly what you want to grow. Whether you’re looking for an organic fertilizer for tomatoes, succulents, flowers, or larger-scale gardening, we’ve got you covered.

Our Top Picks

Here’s a quick look at our picks for best organic liquid fertilizer for vegetables.

Dr.-Earth-Home-Grown-Tomato-Vegetable-Herb-Liquid-FertilizerBest Overall: Dr. Earth Home Grown Tomato, Vegetable & Herb Liquid Fertilizer.
Gardeners love the all natural ingredients and multi-purpose application of the Dr. Earth Liquid Fertilizer.
Kellogg Organic Plus Fish & Kelp FertilizerBudget Pick: Kellogg Organic Plus Fish & Kelp Fertilizer.
We’re big fans of the effectiveness and budget friendliness of this Kellogg Fish & Kelp fertilizer.
Urban-Farm-Fertilizers-Texas-Tomato-FoodTomato Garden Pick: Urban Farm Fertilizers Texas Tomato Food.
This Urban Farm Texas Tomato Food will get your tomatoes popping.
Urban-Farm-Fertilizers-Flowers-BloomsFlower Garden Pick: Urban Farm Fertilizers Flowers & Blooms.
If your flowers need an effective fertilizer with the convenience of a liquid, the Urban Farm Flowers & Blooms delivers.
Espoma-Organic-Cactus-Liquid-Plant-FertilizerCacti and Succulents Pick: Espoma Organic Cactus Liquid Plant Fertilizer.
Succulent and cactus gardens are very popular right now – keep yours looking fantastic with the Espoma Organic Cactus fertilizer.
Alaska-Fish-Fertilizer-for-Organic-GardeningFish/Kelp Derived Pick: Alaska Fish Fertilizer for Organic Gardening.
This Alaska Fish Fertilizer is the key to creating a flourishing garden with high-yield plants.
FoxFarm-Grow-Big-Liquid-Organic-Plant-FoodLarge Garden Pick: FoxFarm Grow Big Liquid Organic Plant Food.
Want to Grow Big in your big garden? FoxFarm Liquid Organic Plant Food has you covered.
 

A Closer Look: 7 Best Organic Liquid Fertilizers for Vegetables & Gardens

Now let’s dial into the details of each organic fertilizer. You’ll find everything you need to know to make a purchasing decision below.

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1. Dr. Earth Home Grown Tomato, Vegetable & Herb Liquid Fertilizer

The best organic liquid fertilizers overall.

Dr. Earth Home Grown Tomato, Vegetable & Herb Liquid Fertilizer
best organic liquid fertilizers overall

Brand: Dr. Earth | Size: 24 oz | Fertilizer Analysis: 3-2-2 NPK | OMRI-Listed: Yes | Spec: 💰

If you’re wondering: what is the best liquid organic fertilizer for vegetables? Well, this Dr. Earth Tomato Vegetable & Herb formula is a leading contender. From root to flower, this gentle fertilizer helps plants flourish.

We especially love that this liquid fertilizer is multi-purpose, reliable, and easy to use. From container plants to raised beds to more extensive use, Dr. Earth is the liquid fertilizer to reach for when you need the overall best organic liquid fertilizer for vegetables.

  • Difficult to over-fertilize
  • Safe around pets and kids
  • Produces a wide variety of large, healthy vegetables
  • Use in conjunction with Dr. Earth’s fast release granules for even more growth
  • Thick/messy if spilled
  • Can attract squirrels, etc. initially
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2. Kellogg Organic Plus Fish & Kelp Fertilizer

The best organic liquid fertilizer on a budget.

Kellogg Organic Plus Fish & Kelp Fertilizer best organic liquid fertilizers on a budget

Brand: Kellogg | Size: 1 Quart | Fertilizer Analysis: 2-2-2 NPK | OMRI-Listed: Yes | Spec: 💰

The best organic gardeners have long used fish fertilizer as a way to keep their gardens flourishing, improving soil health with each application. 

We like the Kellogg Organic Plus Fish & Kelp Fertilizer in particular because it has molasses for an extra boost. It comes in a smaller container, so you can experiment a bit and invest in a larger amount when you see results. Larger, more expensive jugs of organic fish fertilizer are still a great deal, because a little goes a very long way, and lasts a long time.

  • Noticeable, quick growth
  • 100% organic ingredients
  • “It’s done wonders for my garden”
  • Safe for use around children and pets
  • Stinky, but dissipates quickly
  • Can attract animals before it dissipates
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3. Urban Farm Fertilizers Texas Tomato Food

The best organic liquid fertilizer for tomatoes.

Urban Farm Fertilizers Texas Tomato Food best organic liquid fertilizers for tomatoes

Brand: Urban Farm Fertilizers | Size: 128 oz | Fertilizer Analysis: 3.8-3.1-7 NPK | OMRI-Listed: No | Spec: 💰💰-💰💰💰

Using Urban Farm Texas Tomato food is a great way to give your tomatoes the exact boost of nutrition they need. This formula is made up of basic organic macronutrients like nitrogen, phosphorus, calcium and potassium, plus an extensive combination of other natural ingredients, like worm castings, kelp, mycorrhizae, minerals and the specific enzymes that make tomatoes happy.

(If you’re looking for more tomato-specific fertilizer recommendations, check out our guide to the Best Organic Fertilizers for Tomatoes for 2021.)

  • Explosive plant growth
  • “Astonished at the results”
  • Great results, effective and reliable
  • Also works great on flowers and other flowering vegetables
  • Careful when opening after shipping
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4. Urban Farm Fertilizers Flowers & Blooms

The best organic liquid fertilizer for flower gardens.

Urban Farm Fertilizers Flowers & Blooms best organic liquid fertilizers for flower gardens

Brand: Urban Farm Fertilizers | Size: 128 oz | Fertilizer Analysis: 3.6-4-4 NPK | OMRI-Listed: No | Spec: 💰💰💰

If you’re primarily growing flowers in your garden, you need a formula that is lower-nitrogen and higher-phosphorus, like the Urban Farm Fertilizers Flowers & Blooms.This flower food is super-potent; one gallon of the concentrate makes 256 gallons of full-strength fertilizer. 

In addition to providing macronutrients, Flowers & Blooms contains worm castings, humic acid, bat guano, mycorrhizae, kelp, enzymes and other essential nutrients. Unlike more multi-purpose fertilizers, these ingredients are specific to a flower’s entire growth span, from stems and leaves to buds and blooms.

  • Easily used with garden sprayers
  • Healthy plants and awesome yields
  • “If you love your flowers, feed them this”
  • This brand makes great fertilizer products
  • Can burn if you use too much/don’t dilute properly
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5. Espoma Organic Cactus Liquid Plant Fertilizer

The best organic liquid fertilizers for succulents and cacti.

Espoma Organic Cactus Liquid Plant Fertilizer

Brand: Espoma | Size: 8 oz | Fertilizer Analysis: 1-2-2 NPK | OMRI-Listed: No | Spec: 💰

What if you’re not growing vegetables or flowers in your garden but instead succulents or cacti? Succulents and similar plants need a diluted level of macronutrients, so make sure to use a fertilizer specially formulated for your garden, like the Espoma Organic Cactus Liquid Plant Fertilizer.

We especially love the “Easy Dose” cap that aids in precision feeding and helps prevent spills.

  • “Absolutely love this stuff”
  • Promotes lots of new growth
  • Quick and easy-to-use format
  • Special nutrient proportions just for succulents
  • Smells bad
  • A little expensive
  • Wish it came in a larger bottle
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6. Alaska Fish Fertilizer for Organic Gardening

The best fish/kelp based fertilizer.

Alaska Fish Fertilizer for Organic Gardening

Brand: Alaska | Size: 1 gallon | Fertilizer Analysis: 5-1-1 NPK | OMRI-Listed: Yes | Spec: 💰-💰💰

Let’s talk about the (smelly) elephant in the room. Yes, if you use a seaweed or fish-based fertilizer, it’s going to be stinky. But the smell dissipates quickly — plus the amazing results you’ll experience with this Alaska Fish Fertilizer will have you forgetting about any initial funkiness! 

One of the main advantages of fish fertilizer is that it‘s gentle; it won’t “burn” plants, and it’s very multi-purpose. It works especially well for vegetables that are “heavy feeders,” like corn, tomatoes, cucumbers, etc.

  • Gives plants a very noticeable boost
  • “Best thing I ever did for my garden!”
  • Highly concentrated – a little goes a long way
  • A secret weapon that makes vegetables, flowers, trees, and more burst with growth
  • Bit of a nightmare if it leaks during shipping
  • Like many organic fertilizers, it can attract dogs or cats
  • Definitely smelly, though this formula includes wintergreen to help neutralize odor
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7. FoxFarm Grow Big Liquid Organic Plant Food

The best organic liquid fertilizer for very large gardens.

FoxFarm Grow Big Liquid Organic Plant Food

Brand: FoxFarm | Size: 1 Gallon | Fertilizer Analysis: 6-4-4 NPK | OMRI-Listed: No | Spec: 💰💰💰

This fast-acting FoxFarm Grow Big liquid fertilizer does just what it says — grows big! And its concentrated formula and larger size make it especially well-suited for larger gardens.

A 6-4-4 NPK formula is a good all purpose base, but Grow Big also contains Norwegian kelp and earthworm castings, as well as a wide variety of micronutrients and trace minerals. The combination results in lush buds and blooms, plus healthier branching and foundational growth.

While the price point of this best organic liquid fertilizer might seem a little steep at first glance, it’s highly concentrated. In fact, the instructions state that all you need is about 2 teaspoons per gallon of water, every other time you water your garden.

  • Ultra concentrated
  • “Our vegetable yield quadrupled”
  • “All natural steroid for your plants”
  • Big bottle cuts down on plastic waste over time
  • Works well for all plants, including strawberries, peppers, arugula, flowers and more
  • Not certified organic/OMRI-listed
  • A little fussy to get a small amount of liquid out of a large jug

Why Choose a Liquid Organic Fertilizer for Vegetables and Gardens?

Here’s a quick guide and FAQ to help you make the best decision for your garden.

Best Organic Liquid Fertilizers for Vegetables
Image by RossHelen on Canva

Dry vs. Liquid: Convenience

Liquid organic fertilizers are the more customizable choice; they’re also faster and overall easier to use. Dry, slow-release granules and powdered organic fertilizers are highly effective, but they’re also messy, dusty, and need to be worked into soil. Liquid fertilizers, on the other hand, are better for a “quick feed.” They also tend to be more concentrated, so you can adjust how much you dilute them with water, given the type of plant and its growth stage.  

Organic vs. Synthetic 

We highly recommend only using organic fertilizers. While they may result in slightly slower initial growth, over the long run they will provide your plants with natural, sustainable, and gentle support. Organic fertilizers are formulated with naturally occurring plant and animal-based ingredients or natural byproducts (such as composting). Perhaps most importantly, organic fertilizers do not present the danger of mineral or chemical buildup on the surface of soil in the way synthetic fertilizers do.

Synthetic or chemical fertilizers might promote a more dramatic burst of rapid growth, but they are manufactured artificially, using unsustainable practices. They can also be harmful to pets and children, and cause toxic runoff into waterways as they wash away from plants and gardens. 

How to Tell the Difference

A rule of thumb: if your fertilizer is a deeper brown color, and smells earthy or well, a little poopy, you’re likely dealing with an organic fertilizer. If, on the other hand, your fertilizer is a bright color or has brightly colored crystals or beads, and it smells like chemicals, chances are that’s a synthetic fertilizer. Chemical fertilizers tend to be cheaper, but are higher in cost when you consider the need to constantly re-apply, and their overall cost to the environment.

What does it mean if my liquid fertilizer is OMRI-listed? 

OMRI stands for the Organic Materials Review Institute, a nonprofit organization that uses USDA standards to determine whether a product qualifies as organic. If a fertilizer is OMRI-listed, it is free of any chemical or synthetic ingredients and safe to use in organic gardening.

Our Process

For this guide on the best organic liquid fertilizers, our team spent 6 hours researching the most popular options from over 25 brands and manufacturers big and small. We then read about 150 user reviews (both positive and negative) to discover what shoppers thought about each liquid fertilizer. After comparing this data, we narrowed our list down to the top 7 fertilizers on the market. You can count on this research to guide you to a mindful purchasing decision.

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