The Best Organic Lawn Fertilizers for a Green & Lush Grass

If you want to grow the greenest lawn – you need the help of a top-notch fertilizer. However, there are so many different brands sold. It might become painstaking to choose a good product on your own.

Nevertheless, there are some ground rules you need to follow when choosing the proper organic fertilizer.

Firstly, it has to be strong and provide the grass with all the necessary nutrients by improving the soil condition, but not harmful to kids or animals.

Secondly, it has to contain natural, eco-friendly and biodegradable ingredients.

Country car with organic lawn fertilizer

To help out with your decision, we prepared a detailed list of the best organic lawn fertilizers sold on Amazon.

As soon as you go through our list of fertilizers and detailed advice, we’re positive you can find the right product for your lawn.

Top Pick

Unco Industries Wiggle Worm Soil Builder Earthworm Castings Organic...

Our top pick is without a doubt the Earthworm Organic Fertilizer by Unco Industries.

It contains pure castings of earthworms and works perfectly with different types of veggies, flowers, plants and lawn grass.

Plus, it doesn’t contain any toxic ingredients and it can make your lawn greener than ever.

Budget Pick

Organic Super Seaweed Humic Acid Blend- Liquid Sea Kelp for Grass and...

However, if you’re working with a limited budget check out the Super Seaweed Fertilizer by Simple Lawn Solutions.

It’s enriched with fulvic acid, which can increase nutrient uptake and improve plant growth.

You can use it for your vegetable garden or lawn grass. Results are visible in just a few weeks.

Why Use Organic Fertilizers?

Unlike their synthetic relatives, organic or natural fertilizers contain lower amounts of nitrogen, phosphorus, and potassium.

They’re mostly prepared from plant or animal material such as mushroom manure, bone meal, blood meal, cottonseed meal, poultry, kelp, or compost.

On the other hand, synthetic fertilizers contain synthesized nitrogen, potassium and phosphorus and they have more of these ingredients than the natural ones.

Although this can lead you to think that synthetic fertilizers are better, because of the higher NPK content – this is just a short-term solution.

With a synthetic fertilizer, you might see immediate and fast results however, an organic product may take some time to catch on but can give you long-lasting results and improve the soil’s texture.

We can conclude that organic fertilizers can provide value to both soil and plants and if used appropriately won’t cause a burn or damage your plants otherwise.

Experienced gardeners know that patience is essential if you want to see good results from organic fertilizers; thus, rest assured it’s all worth it.

What are the Types of Organic Fertilizers?

There are a few different types of organic fertilizers and they’re divided by the type of ingredients they’re made of.

Animal-based Fertilizers

The name of the product is quite explanatory. These are fertilizers made of animal ingredients such as feathers, bone, blood meal and manure.

Usually, animal-based fertilizers are great at boosting the soil’s nitrogen level and they release nutrients rather fast.

However, when applying this type of fertilizer be careful not to overuse them since this can burn the lawn grass.

Plant-based Fertilizers

These fertilizers usually have lower levels of nutrients and are much better in improving your soil condition than providing nutrients to the plants.

One of their best features is the fact that they can increase water retention in dry soils which in turn improves the grass’s water uptake.

Most commonly, plant fertilizers contain kelp seaweed, cottonseed and alfalfa meal.

Treated Sewage Sludge

These fertilizers are sometimes called biosolids and they contain composted and treated sewage material until it becomes a fertilizer that’s safe to use.

They are rarely used in households and are more popular in commercial gardening.

What about NPK?

When choosing a fertilizer always pay attention to the NPK ratio which’s written on the package. As you already know the NPK can tell you the amount of nitrogen, phosphorus and potassium a certain fertilizer contains.

The numbers are usually represented in percentages and depending on the soil’s requirements you can choose one that fits your specific needs.

Most probably, the lawn soil already contains most of these nutrients but you can always use fertilizer to encourage growth and greener grass.

When it comes to taking care of lawn grass, the levels of nitrogen are essential. You have to make sure the fertilizer has a higher percentage of this nutrient.

It’s important to distinguish between established and new lawn grass. Although your established grass requires more nitrogen a developing one needs more potassium and phosphorus for root expansion.

Below, you can read through the main benefits the NPK has for your grass:


This nutrient is essential for proper grass growth and it helps develop a vivid green color. Plants that have low levels of nitrogen can develop chlorosis which causes a yellow grass color.


Phosphorus is important for strong root development and if the plant lacks this nutrient it can show signs of stagnant growth.


Protecting your plants from cold, drought and disease can’t happen without potassium. A potassium deficient soil can decrease the growth rate of the plant plus this nutrient complements the other two nutrients and increases their potential.

As we mentioned previously organic fertilizers usually have lower nutrient levels and to understand what the ideal NPK ratio for your lawn is, it’s always a good idea to test the soil.

You can test it by yourself or send a sample to a laboratory and get more precise results.

Tips and Tricks for Fertilizer Efficiency?

We would like to share with you some tips and tricks that can help you optimize the efficiency of the fertilizer you use.

  • First, make sure to plan the fertilizing on time and never leave things for the last moment. Organic fertilizers take time to show their benefits and that’s why you shouldn’t wait for the grass to grow yellow, but apply beforehand.
  • Furthermore, before applying fertilizer make sure you mow the lawn since this allows more fertilizer to get in the soil. You should leave the leftover grass cuttings on the ground to decompose and become a part of the fertilizing process.
  • As soon as you’ve applied the fertilizer start watering your lawn, but never overdo it.
  • Autumn months are the best period for applying fertilizer because it gives it time until springtime to do its magic. Of course, you can add it during the spring or summer months, but this might take more time to have any visible results. Some fertilizers are specially made for different seasons.

Organic Lawn Fertilizers Review

1. Earthworm Organic Fertilizer by Unco Industries

Highlighted Features

  • Organic ingredients
  • Perfect for houseplants & veggies
  • Non-toxic fertilizer
  • 15 lb. packaging
  • No gnats

Keep calm and check out the Earthworm Organic Fertilizer by Unco Industries!

If you have the help of organic earthworms – you’ve found the perfect product. Experienced gardeners realize the importance of worm castings in minimizing pest damage.

So, unless you like to keep a big bucket of worms in your back yard this product can help improve pest and disease resistance and your grass will start blooming in no time.

Moreover, this is an organic, non-toxic fertilizer so you can be certain you’re protecting the environment and those around you.

It comes in 15 lb. packaging which is great to cover a large lawn area. Just one handful of this fertilizer can make your plants happy and healthy in a matter of weeks.

2. Advanced Balanced NPK Lawn Fertilizer

Highlighted Features

  • NPK 16-4-8
  • Top-quality organic ingredients
  • Easy to use
  • Suitable for all types of grass
  • USA product

If you’re looking for a simple lawn solution, this is the perfect product to help with your gardening activities.

It has an ideal NPK ratio of 16-4-8 that can assist in growing and maintaining green grass. It works perfectly with any type of grass such as Zoysia, Augustine, Florida Palmetto, Buffalo, Bahia, Centipede, Fescue, Kentucky Bluegrass and Ryegrass.

It also contains seaweed, fish nutrients and no harmful chemicals that can damage your beautiful grass. For optimum nutrient intake, make sure you water your lawn generously.

The manufacturer is a USA family business that has more than 25 years of experience in the commercial turf industry, so you can be certain to receive the best care possible.

Once you use this product and see its benefits you’ll never stop using it and enjoy your thick and green grass.

3. Safer Brand Lawn Fertilizer

Highlighted Features

  • Revitalizing features
  • Promotes healthy root growth
  • Year-round nurturing
  • 6,250 sq. ft. coverage
  • Greener lawn in 5 days

Some gardeners prefer their products to have durable, year-round coverage. The Safer Brand fertilizer doesn’t distinguish between seasons and can do wonders for your lawn regardless of the weather.

It only requires 3 applications a year to provide your precious lawn with the basic nutrients for optimum growth and health.

Due to the slow-release formula, one application can cover up to eight weeks of slow nutrients release.

What’s more, the product is really easy to use – just apply it evenly on the wanted area and let it do its thing. You can see your lawn become greener in just 5 days.

Additionally, this is not a toxic product and it won’t cause any damage or burns to your greenery and it will make you and your plants happy.

4. Organic Micro Booster Fertilizer by Simple Lawn Solutions

Highlighted Features

  • Healthy & green grass
  • All-purpose
  • USA product
  • Fast nutrient absorption
  • Increased taste, quality & color

The Organic Micro Booster Fertilizer is an amazing USA formula prepared by Simple Lawn Solutions.

It contains a strong mix of different micronutrients such as Zinc, Magnesium, Iron and Sulfur that are specifically added to prevent mineral deficiency and speed up nutrient absorption.

You’ll love this product since it’s an all-purpose fertilizer that can be used for your lawn, different vegetables, flowers and juicy tomatoes.

As soon as you start using applying you’ll notice the improved taste, quality and color of your backyard vegetation.

The manufacturer guarantees to give your money back if you’re not satisfied with the product- this won’t happen, but it’s a great promise of the product’s quality.

5. The Andersons Organic Fertilizer

Highlighted Features

  • Slow-release formula
  • OMRI listed
  • Easy to use
  • No burn guarantee
  • Safe for kids & animals

The Andersons organic fertilizer is a slow-release formula that breaks down immediately after contact with rainfall or artificial irrigation.

It has a good 7-1-2 NPK ratio that provides your lawn with the perfect amount of needed nutrients. This fertilizer is OMRI listed for organic use and doesn’t contain any toxic ingredients so don’t worry about any dangers for your kids and animals running around the lawn.

Unlike some other fertilizers, the Innova doesn’t have a strong smell and there’s no risk of over-using or burn damage.

Also, it doesn’t contain any sewage, manure, waste products or animal parts and it’s completely eco-friendly and safe to use.

Happy customers confirm that this product simply works and you’ll see your lawn grass improve dramatically.

6. Purely Organic Fertilizer for Lawns

Highlighted Features

  • Promotes more green
  • No burn damage
  • Plant formula
  • No chemicals
  • Convenient & animal friendly

Who doesn’t enjoy a green lawn! Making this happen sometimes takes a lot of time and effort but it’s well worth it plus it can be used all year round and cover up to 5,000 sq. ft. of grass.

To make things easier on yourself always use renowned, quality products that can be your best pal in maintaining your lawn or garden.

The plant-based fertilizer by Purely Organic Products can improve your turfgrass and won’t burn it in the process plus, it doesn’t have a funny smell.

Unlike synthetic fertilizers, organic fertilizers take some time to show their effects so don’t expect to see instant results.

However, as soon as you see them they’ll be there to stay!

7. Simple Lawn Solutions Super Seaweed Fertilizer

Highlighted Features

  • Organic seaweed blend
  • Increases nutrient uptake
  • Commercially used
  • 32-ounce package
  • Suitable for different grass types

The Simple Lawn Solutions liquid fertilizer is a blend of seaweed, humic and fulvic acid. It can be a great source of organic nutrients for any lawn or garden.

Once you start using it, the cation exchange capacity of the lawn soil will increase and promote better nutrient uptake and healthier lawn grass.

All of the ingredients contained in this liquid fertilizer are natural minerals that can improve any pH problems as well as the seed’s germination capacity.

You can see immediate results after the first application and according to some users, the results come in just 24 hours.

Any bare areas of your lawn that are struggling to grow will be blooming with greenery as soon as you apply this fertilizer.

You’d be happy to hear that it can be used for different types of grass, plants, veggies and flowers.

8. Lawn Food Natural Liquid Fertilizer

Highlighted Features

  • 15-0-15 NPK
  • Improves greenery
  • High-quality ingredients
  • Different grass types
  • Enhanced with humic/fulvic acid

Any lawn that has low levels of nitrogen and potassium needs this organic fertilizer. The perfect NPK ratio of 15-0-15 can help tune up your yellow lawn and get the green out it in just a few weeks.

It’s made with top-quality organic ingredients that won’t burn or damage your grass and cause any additional stress.

The 32-ounce packaging is very practical and can be made for easy application to any grass type such as Bermuda, zoysia, centipede, Augustine, buffalo, bluegrass and palmetto.

Last but not least, the liquid fertilizer is enhanced with humic/fulvic acid that can help increase the nutrient uptake and food transfer through the plant’s body.

Final Thoughts

The long-term use of organic fertilizers can improve the overall soil condition, texture and drainage while the slow-release formula won’t overwhelm or burn the grass. Additionally, organic fertilization will continue in the next few weeks.

Although organic fertilizers might be more expensive than their synthetic counterparts, they’re well worth the money and the long-term effects they deliver – even out the cost.

The best organic lawn fertilizers we presented in our article are eco-friendly, biodegradable, safe for the environment, and can be used around kids and animals.

Our recommendation is the Earthworm Organic Fertilizer by Unco Industries that’s made of natural earthworm castings and can do wonders for all your veggies, flowers and turfgrass.

On the other hand, if you need a less expensive yet great option, check out the Super Seaweed Fertilizer by Simple Lawn Solutions.

It’s enhanced with fulvic and humic acid that improves the soil’s nutrient intake and can make your lawn greener than ever.

We’re certain that our article can give you enough info to make the right decision – so take your pick and happy gardening!

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