best liquid lawn fertilizer

10 Best Liquid Lawn Fertilizer Concentrates | Reviews + User Guide

To keep your lawn healthy and green, fertilizing can be a good practice, especially if your soil is lacking in nutrients. There are many fertilizers available on the market and it can often be a little overwhelming to decide which is the best for your particular lawn needs. 

One option that can yield immediate results is a liquid lawn fertilizer concentrate. These cost-effective products provide systematic long-term nutrient care for your lawn and most of them are easy to apply and with iron and other beneficial minerals. 

In this article, we’ve included a detailed user guide to the best liquid lawn fertilizers available no matter what your goal. Plus our gardening experts have tested 10 of the top sellers from premium brands to help you choose the right one for your lawn care needs. 

Benefits of Using Liquid Fertilizer 

There are many valid reasons to choose a liquid fertilizer over a granular formula. Let’s assess some of the main benefits of liquid lawn fertilizers:   

Easy To Apply Nutrients

Most liquid nitrogen fertilizers can simply be attached to a garden hose for easy and convenient application. These products provide a consistent nutrient application in an even manner as the components are sprayed within the viscous form. This means, your entire lawn will receive the same amount of fertilizer throughout.  

High Liquid Concentrate

Since liquid fertilizers are highly concentrated, you get a lot of usage out of one bottle. What’s more, the product is much easier to carry around the yard when compared to the amount of granular fertilizer you’d need to cover the same area, thus saving you money and effort. 

Fast Acting Feed

Liquid fertilizers provide nutrients to the roots and surface of the grass so your lawn is able to absorb these nutrients quickly. Granular fertilizers, on the other hand, are designed as slow-release food that can take longer to take effect. 

Liquid Lawn Fertilizer Vs Granular

Liquid nitrogen fertilizers have gained popularity in recent years, and although there are no real differences between the total amount of nutrients provided by liquid or granular fertilizers, there are other notable differences in the application and absorption. So let’s look at the fundamental benefits of liquid lawn fertilizer vs granular fertilizer.

Liquid Lawn fertilizer 

Pros

  • Uniform and even application
  • Phosphorus can absorb better in the grass
  • Better for starter lawns
  • Easy to apply
  • Quick release product

Cons

  •  Set up or application process can be expensive
  •  Requires more frequent application 

Granular Lawn fertilizer 

Pros

  •  Easy to store for long periods of time
  •  Slow release product
  •  Efficient for pre-planting

Cons

  • May burn plants
  • Harder to apply evenly
  • Certain nutrients can’t be absorbed as efficiently
  • Takes longer to yield results

10 Best Liquid Lawn Fertilizer Concentrates

Need help choosing the best liquid lawn fertilizer? Our selection criteria include the fertilizer’s compounds, its performance, value for money, and the level of customer satisfaction, taking into account thousands of user reviews across major online platforms. Take a look at our experts’ comprehensive review of the 10 best liquid nitrogen fertilizer concentrates starting from our top pick:  


1. Advanced 16-4-8 Liquid Fertilizer Spring & Summer

Advanced 16-4-8 Liquid Fertilizer Spring & Summer

This 16-4-8 liquid nitrogen fertilizer from the US brand Simple Lawns Solutions is one of our top picks for lawns and plants. The formula contains fish and seaweed, with all three major nutrients (the majority being nitrogen) for quick release fertilization.

But since this instant release fertilizer doesn’t stay long in the soil, you’ll need to feed your lawn regularly until results are noticeable.

How to apply: the highly concentrated formula comes in a ready-to-use bottle complete with a fertilizer sprayer nozzle. Just connect it to your garden hose for quick and easy application in spring and summer.

The 32-ounce liquid fertilizer works on all grass types with up to 3,200 square feet of coverage! Just be sure to keep your grass watered sufficiently for maximum nutrient absorption.

Customer reviews: users were pleased to find the Simple Lawns Solutions bottle having its own dispenser. They simply hooked it up to their garden hose and within a matter of days, their dull and lifeless lawns turned healthy and green. Thousands of customers rated this product 4.2 out of 5 stars making it a star buy.   

Pros

  • Suitable for all grass types
  • Super quick results
  • Works even during dry weather

Cons

  • Sprayer bottle may not work  

2. Simple Lawn Solutions Extreme Grass Growth Lawn Booster

Simple Lawn Solutions Extreme Grass Growth Lawn Booster

If your grass needs a quick boost of nutrients, then consider this natural liquid fertilizer from Simple Lawn Solutions. The product promises to increase the vertical and lateral growth of grass within a matter of days.

This high phosphate concentrate (6-19-0) is energized with humic acid and fulvic, making it ideal for new sod and seeding. In fact, the Growth Booster is an excellent fertilizer for both new and worn out lawns that need a helping hand to come back to life.

We love the hose-end liquid fertilizer sprayer that comes with the bottle as it makes application super easy. And since the product contains natural ingredients, you won’t have to worry about the safety of your pets and children.  

To apply the fertilizer, simply attach the bottle to your garden hose and it’s ready to go. You can use it on all types of grass.

Customer reviews: users were impressed with the results that were evident within just a day or two after application and rated the product 4.1 out of 5 stars. 

Pros

  • Covers 3,200 Square Feet
  • Ready to spray bottle
  • Quick results

Cons

  • Nothing of significance

3. LawnStar 30-0-0 Liquid Nitrogen Fertilizer Lawn Food

Does your lawn have more weeds than green grass? Have you noticed fewer clippings and yellowing foliage? These may be signs of nitrogen deficiency. The good news is, LawnStar has created a great formula (30-0-0) with a blend of fast and slow-release nitrogen for long-term results.

To kickstart your lawn’s growth and maintain it throughout the growing season, use the product in the spring and summer. You’ll see long-lasting results within a few weeks. The high-quality nitrogen formula is suitable for all grass types.

The other advantage of this liquid nitrogen fertilizer is the generous size of the bottle (one gallon) that covers up to 16,000 square feet. To apply, simply follow the mixing instructions on the bottle. You’ll need a pump sprayer or garden hose for application.

Customer reviews: users rated the fertilizer 4.3 out of 5 as they didn’t find it easy to dispense the product from the bottle as it was more like a gel-like substance than liquid. They recommended giving the bottle a hot bath by placing it in a 5-gallon bucket filled with hot water. The gel substance will then flow like liquid. Overall a good performing liquid nitrogen fertilizer.

Pros

  • Excellent coverage of up to 16,000 sq feet
  • Suitable for all grass types
  • Long-term improvement

Cons

  • Gel-like substance need warming for easy application

4. Envii Greenkeeper’s Secret Liquid Lawn Food

We couldn’t finish our review without recommending another natural liquid fertilizer from a family-owned UK-based company, Envii. The 7-15-19 formula promises to improve the health of both soil and grass, with results within 7-10 days.

What makes this product so unique is its bio-stimulant technology that allows stronger root growth and increased resistance to heavy rain and drought. Furthermore, it is completely safe for children and pets as well as on other plants.

And if that weren’t enough, those who are concerned about the environment will be pleased to know that the container is made from recycled plant-based materials, thus you can compost it after use!

Perhaps the biggest downfall of this product is its price. The 1-liter bottle only covers 300 square meters. There is also the bottle’s short connector that makes it almost impossible to connect to a garden hose.

Customer reviews: the product has a score of 4.3 out of 5 as users were impressed with how quickly this liquid feed transformed their lawn. They even noticed the dead patches turning into a lush, dark green color soon after application. The one complaint they had was the short integral connector on the bottle, which doesn’t fit on standard garden hose attachment. Best to use a pump sprayer instead. 

Pros 

  • Quick results
  • Works on shrubs and trees not just grass
  • Pet and children friendly 

Cons 

  • Connector on the bottle is a little short
  • Expensive 

5. Simple lawn solutions 3-18-18 Liquid Lawn Fertilizer

Simple Lawn Solutions 3-18-18 Liquid Lawn Fertilizer

Another great product from the family-owned company Simple Lawn Solutions is the 3-18-18 formula. It is especially ideal for lawns that lack potassium and phosphorus. Made from organic ingredients, this high potassium and phosphorus liquid fertilizer encourages healthy and strong grassroots in the safest way. Thus, you won’t need to worry about damaging or burning your grass with harsh chemicals as the product is completely natural.

Another excellent feature of this liquid fertilizer is its simple application. Just like all the other fertilizer products made by Simple Lawn Solutions, minimal effort and time are needed to apply this fertilizer.

Customer reviews: users rated this product 4.3 out of 5 stars because of how quickly it turned their grass green and healthy. Overall, this is another one of our favorite liquid fertilizers from the same brand that doesn’t burn grass or other plants thanks to its natural ingredients.

Pros

  • Ideal for all grass types
  • Turns grass green in the quickest time

Cons

  • Spray bottle may not work 

6. Miracle-Gro EverGreen Fast Green Lawn Spray & Feed 1L

Miracle-Gro EverGreen Fast Green Lawn Spray is a really fast-acting lawn fertilizer that claims to work within 24 hours. I’ve used it a few times, not sure I’ve seen it work in 24 hours, but it’s fast. Give it a few days and you can see the difference. With very high nitrogen-based N-P-K 27-0-0 you get lush green grass that will last a month or so. I would suggest applying it every 4-6 weeks for the best results.

I like to consider this product as an emergency product. Maybe if your lawn is looking tired and you’re going to host a party or BBQ and you need that ‘get out of jail’ fast-acting product, then this is it. You apply it directly from the bottle with a hose attachment, making for a simple solution.

Customer Reviews: Miracle-Gro customer usually wants simple to use and convenient fertilizer. Well, the brand of choice will not let you down if that’s what you’re looking for. A plug and play spray bottle that delivers results within a weekend.

Pros

  • Super-fast acting lawn fertilizer
  • Convenient spray attachment
  • High Nitrogen fertilizer 27-0-0

Cons

  • Last 4-6 weeks, so buy a multi-pack

7. Environmental Factor Liquid Corn Glute Lawn Fertilizer

Environmental Factor Liquid Corn Glute Lawn Fertilizer

The natural based liquid corn gluten from the brand Environmental Factor is designed for established lawns that need a boost of protein. As well as thickening your lawn, this product will keep out those pesky weeds. Warning: do not apply this fertilizer to newly seeded gardens as germination can get adversely affected. 

How to apply: mix 3 parts water to 1 part fertilizer and spray evenly to your lawn starting from the top. Every liter of corn gluten meal covers 1,000 square feet when mixed with water.

Customer reviews: this liquid fertilizer only scored 3.8 out of 5 as most users found the liquid fertilizer sprayer clogging up during application and some of their plants got burned in the process. 

Pros

  • More area coverage
  • No assembly required

Cons

  • Not ideal for sprayers
  • May burn plants

8. Scotts Liquid Turf Builder Ready to Spray Fertilizer

Scotts Liquid Turf Builder Ready To Spray Fertilizer

Scotts liquid turf builder comes with a ready-to-spray hose-end attachment to make application super easy. This means there is no mixing required so you can use the product as soon as you receive it. On top of that, it’s safe for use on all types of grass.

Since you can connect the bottle to a garden hose, you can water your lawn at the same time, but keep in mind that results take time and several applications throughout the year are required.

This liquid fertilizer is ideal for thickening newly planted grass, making it an excellent choice for new lawns, whether planted from sod or seed. Scotts liquid turf builder works by going directly to the root and stimulating new growth. Even healthy lawns that require a boost of nutrients throughout the growing season can benefit from this product.

When we tested the product, we found that it gave 35% faster results than granular fertilizers. However, the bottle only covers 600 square feet, which is a little disappointing.

Customer reviews: users rated Scotts liquid turf builder 4.2 out of 5 for the great results it yielded. Their lawns became thicker and greener, but it didn’t happen as quickly as they had hoped. 

Pros

  • Ready and easy to use bottle
  • Ideal for newly sown grass
  • No mixing required

Cons

  • Not a lot of coverage
  • May take up to a season to see results 

9. Ferti-Lome Liquid Iron Lawn Fertilizer

Ferti-Lome Liquid Iron Lawn Fertilizer contains 0.5%chelated Copper, 3.25 % chelated Iron, 0.15 % chelated Manganese, 0.16% chelated Zinc.

The perfect way to deal with iron deficiency in lawns, citrus trees, houseplants, shrubs, trees, vegetables, and flowers. This is not a whole fertilizer but should be used in conjunction with a nitrogen fertilizer. Ferti-Lome Chelated Liquid Iron should be used to correct your lawn nutritional deficiencies when you have signs of yellowing or browning.

I recommend using this spray throughout the growing season around every 8 weeks for the best results.

Pros

  • A great combination of minerals to tackle deficencies
  • Low cost liquid iron lawn fertilizer

Cons 

  • Needs to be used on conjunction with nitrogen lawn fertilizer

10. Medina Ready-to-Spray HastaGro Liquid Lawn Fertilizer

Medina Ready-To-Spray HastaGro Liquid Lawn Fertilizer

The 12-4-8 liquid lawn fertilizer formula from Medina is a ready-to-spray product that promises to turn your lawn green quickly.

What we especially like about this fertilizer is the reusable hose-end liquid fertilizer sprayer bottle that provides up to 4,000 square feet of coverage. When used every month from spring to fall, this liquid fertilizer will turn your lawn thicker and greener.

Customer reviews: users were pleased with how green and lush their lawns turned after the first application. They recommended applying the fertilizer first thing in the morning when the grass is moist to maximize the application. However, the product was only rated 3.8 out of 5 because of the bottle being a little tricky to operate and not creating a watertight seal with the garden hose. 

Pros

  • Instant results
  • Great coverage 
  • No assembly required

Cons 

  • Bottle is a little difficult to operate 

11. Southern Ag Chelated Liquid Iron For Lawns

Southern Ag Chelated Liquid Iron For Lawns

Okay not a product with outstanding marketing behind it, but for those anemic looking shrubs and lawns, consider this liquid iron fertilizer for lawns from the brand Southern. It really is excellent. The product turns grass a deep, rich green color, and can also be used on shrubs, vegetables, and flowers.

How to apply: mix liquid iron for lawns with water and apply as a drenching spray on the lawn. 

Customer reviews: with an impressive score of 4.5 out of 5 stars, users noted the huge difference to their iron-deficient shrubs and lawns within a week after application. The yellowing leaves of their trees and limp grass turned green and healthy, which makes this product one of our favorites in terms of value for money and performance. Important: customers recommended using gloves before applying liquid iron for lawns concentrate as it may stain your hands.   

Pros

  • Ideal for all types of plants, trees, lawns, vegetables, and shrubs
  • This iron lawn fertilizer delivers quick results
  • An easy to apply liquid iron for lawns

Cons

  • Can stain hands and concrete

12. Plantworks Empathy Liquid Lawn Feed

This liquid lawn stimulant from the UK-based company, Plantworks Empathy, contains organic seaweed and extra iron suitable for all lawn types. The 1-liter bottle fertilizer will cover up to 50 water cans.

The natural plant stimulant is processed using special technology to maximize the hormones that stimulate lawn growth. Along with kelp, this liquid feed also contains a wide range of vitamins, amino acids, and nutrients, including iron, nitrogen, potassium, and phosphorus, which all help the lawn become more resistant to moss and weeds. 

The product is specially designed for all types of plants and grass.

Customer reviews: users rated this product 4.4 out of 5 as it produced lovely rich green grass within 4-5 days. They also noticed how quickly their grass grew right after application. Customers liked the fact that the product contains organic ingredients, making it pet and children friendly. 

Pros

  • Organic ingredients
  • Quick results
  • Ideal for all lawn types

Cons

  • Nothing of significance 

How to Apply Liquid Nitrogen Fertilizer To Your Lawn?

There are two ways to apply liquid fertilizer to your lawn, by foliar or ground application. Since most liquid fertilizers are highly concentrated, before applying the product, you’ll need to make sure it is properly diluted. Otherwise, you risk burning your plants. Having said that, some of the products we reviewed were ready to use so all that’s required is to shake the bottle well to mix all the contents before connecting it to a garden hose.

Start from the top end of your lawn and spray in a side to side motion to cover the entire area.

In case the product you’ve chosen doesn’t come with a spray nozzle, you can use a hose-end sprayer or even a pump sprayer. The hose-end sprayer works similar to a garden hose sprayer. 

A pump sprayer, however,  is a tank that you wear on your back after filling it with the properly diluted fertilizer.  To operate this sprayer, you’ll need to add pressure to the tank using the handle. To release the fertilizer, hold the wand and press the button. Again, make sure you start from the top end of your lawn and spray your way down so as to avoid walking over the newly fertilized grass. 

When to Apply Liquid Lawn Fertilizer?  

When you should apply the liquid fertilizer on your lawn depends on which product you’re using. Make sure you read the instructions on the bottle as each product is either designed for spring and summer or year-round application. That said, liquid fertilizers are generally applied in spring to help your lawn absorb all the nutrients. 

Some of the products we recommended are specifically for spring and summer. The first application is given in spring with subsequent small doses applied every few weeks until early summer. 

Note, if you’re applying chemical liquid nitrogen fertilizer in the peak of the summer season, it may burn your lawn. It would be safer to use an organic liquid fertilizer early in the morning during the summer months so as to avoid damaging the grass. On a final note, make sure the ground is moist when fertilizing your lawn for optimal effect. 

How Much Liquid Nitrogen Fertilizer to Apply?

How much liquid nitrogen fertilizer you should apply depends on your lawn’s size and how much nutrient it needs throughout the year. If you apply too little, you won’t get the desired results; apply too much and you may damage your grass, so it pays to know the right amount of fertilizer to apply.

Soil Testing

The best way to determine how much liquid fertilizer you need to apply is to test your soil. By using a soil test kit, you will know how much nitrogen, phosphorus, and potassium your lawn needs. There are many simple to use home test kits that measure all three of the main nutrients in your soil. The ones we like are in the form of capsules from Luster Leaf.  

Once you find out your soil’s deficiencies, you can then choose the right fertilizer. Check the product’s NPK ratio and be sure to follow the instructions.

Best Liquid Lawn Fertilizer Conclusion

Liquid lawn fertilizers provide a simple, quick, and many times an easy application for small and large yards. While these fast-acting products yield excellent results, they often require a regular application for optimal lawn establishment. 

Whether you’re looking for a specific feed for your newly sown grass, or you want to give your tired old lawn a new lease of life with a liquid iron for lawns, you’re bound to find the most suitable liquid fertilizer from our shortlist of outstanding products.

If you’re really still confused and just want a recommendation I would suggest Scotts Liquid Turf Builder for new lawns, and all the products from Simple Lawn Solutions are well worth checking out for established grass.

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