My Honest Review of Miracle-Gro Lawn Food

Written by Daniel Woodley. Reviewed by Elizabeth Smith. Published to Lawn Care on 28th March 2023.

Our editors publish helpful guides and insights learnt from years of experience and recent research. They also test, review and suggest plants and products. If you buy something via links, we may earn a commission, but we have a strict editorial process.

Hello and welcome to DIY Gardening’s review of Miracle-Gro Lawn Food.

My name is Daniel Woodley, and I’ve been using this lawn fertiliser on and off for over a decade, but I rarely use it these days as I’ve since found better products that are healthier for my lawn and the environment in general.

Don’t get me wrong, it works wonders, and I always keep a spare pack in the shed for emergencies, but I feel there are better options.

This is my honest review of Miracle-Gro Lawn Food.

Miracle-Gro Water Soluble Lawn Food, 1 kg
Miracle-Gro Water Soluble Lawn Food, 1 kg
Miracle-Gro Water Soluble Lawn Food, 1 kg
Miracle-Gro Water Soluble Lawn Food, 1 kg

What’s in the Lawn Food Pack 

Miracle-Gro Lawn Food is sold in two packs:

  • 1kg cardboard box with 2 x 500g plastic bags.
  • 2kg plastic sealable tub with 4 x 500g plastic bags.

Each 500g bag contains a greenish blue powder which dissolves easily in water.

I strongly recommend you buy the larger 2kg plastic tubs as the lid is resealable and this will protect the powder from moisture.

I lost an entire bag’s worth of this fertiliser over the winter as the powder in the cardboard box absorbed the moisture in my shed and this was the end result:

Miracle Gro Lawn Food

As you can see from the image above, the powder dissolved and then solidified into a hard rock that wouldn’t mix with water. 

The cardboard box, which fell apart, offered no protection.

I really think you should buy the plastic sealable tub version instead.

NPK Ratios and Dosages

NPK stands for Nitrogen, Phosphorous and Potassium and are the three major nutrients needed for optimal growth and to avoid deficiencies.

Miracle-Gro’s NPK ratios are:

Nitrogen: 36%

Phosphorous: 6%

Potassium: 6%

+ added iron

Dose: 1 x 4.5 litre watering can and 1 x 15ml scoop of Miracle-Gro will treat 2.5 sq mtr of lawn. It can also be applied via a hose with a mixer.

Frequency: Once a month.

What This Product Does: The high concentration of nitrogen is designed to make the grass grow quickly, and the added iron will help it go a deep green colour. The other ingredients help with root growth and disease resistance but this product is all about the nitrogen.

My Experience With Miracle-Gro Lawn Food

As part of my review of this lawn fertiliser, I used it on my lawn for an entire year.

I applied it via a watering can once a month from April to September, and here’s what happened:

1) I found that it mixed well with water and didn’t block the watering can, but the 500g plastic bags were horrible to work with, and I spilt the powder on the floor despite being careful.

2) The powder also stained my fingers as I had to dig the scoop into the bag (yes, I should wear gloves).

3) It took about 6-7 days before I noticed an improvement – the grass looked more vertical, was clearly growing faster and looked noticeably greener.

4) I also noticed that some of my border plants picked up too and grew leggy, most likely due to the runoff from the lawn.

5) The grass grew so quickly that I went from cutting it once a week to twice a week, and after heavy bouts of rain, it probably needed a thrice-a-week cutting to keep it looking neat.

6) The cardboard box fell apart in the winter, probably from some moisture in the shed. I’ve found that this powder absorbs moisture from the air, as I had the pack stored on a shelf.

Miracle Grow Lawn Feed

Why I Won’t Use Miracle-Gro Again as My Main Fertiliser

My main issue with Miracle-Gro Lawn Feed is the sky-high nitrogen content.

For those of you that are new to gardening; nitrogen causes plants to grow long and leggy. On lawns, it makes the grass grow tall and thin very quickly.

36% nitrogen isn’t just high, it’s off the charts! This product has one of the highest nitrogen concentrations of any lawn fertiliser on sale, and for me, it’s too high.

Sometimes my grass looks a little dull, and I just want to “green it up”, but that doesn’t mean I want to mow it three times a week. I have since found other products that improve the colour without making it grow like crazy. Products like iron sulphate work really well at turning brown or dull grass into a lush, green carpet.

Also, for general health and disease resistance, I’ve found that seaweed extract feed is brilliant as it contains many micronutrients that aren’t in general lawn fertilisers.

More recently, I’ve been using a combination of seaweed feed and slow-release lawn fertilisers to get the best of both worlds; a healthy, lush, green lawn that I don’t need to mow every 10 minutes.

What I Like

  • It’s highly concentrated and very fast acting – like steroids for your lawn.
  • It’s perfect for emergencies when the lawn looks tired and needs an instant hit.
  • Miracle-Gro dissolves in water and into the lawn very quickly.
  • It’s one of the cheapest lawn fertilisers on sale.

What I Dislike

  • I despise the horrible little plastic bags as they aren’t resealable.
  • The cardboard boxes fall apart and don’t keep out moisture (buy the plastic 2kg instead).
  • I found it far too easy to spill, and it stains the skin blue/green.
  • The nitrogen content is so high that when I used it as a monthly feed, I had to mow the lawn more frequently than I wanted to.
  • It’s not organic or natural.

Who I Recommend Miracle-Gro To

I recommend Miracle-Gro Lawn Food for three situations:

1) As an emergency lawn fertiliser to pick up the grass as quickly as possible after a drought or period of neglect.

2) To those who want to achieve a great lawn and don’t care how often they need to mow it and don’t mind putting down a product that’s not organic, natural and has sky-high levels of nitrogen that will runoff into nearby plants which might cause them to grow leggy.

3) To anyone who just wants to experiment by dosing the lawn with sky-high levels of fertiliser just for fun or to see what results they can get if they go completely overboard.

Please don’t get me wrong; this product works very well. I just don’t think it’s the most practical or environmentally-friendly way to achieve a lovely lawn.

I would rather go with a more balanced slow-release lawn feed that lasts for months and a fortnightly dose of natural seaweed extract feed.

Miracle-Gro Lawn Food Questions Answered

Can Miracle Gro be Used on New Lawns?

I’ve used Miracle-Gro Lawn Food on newly seeded lawns without waiting for the grass to establish, and I never had any issues. I have heard of other gardeners saying you should wait until after the first cut but I’ve used it before then without issue.

It can also be used on new turf as well.

I must point out that this lawn food probably isn’t the best option for root development, it’s primary feature is top growth.

Is This Safe For Pets and Children?

Miracle-Gro Lawn Food dissolves into the water very quickly and unlike pellets, it doesn’t sit on the surface of the lawn, making it safe for pets and children once dry.

I have a dog here and have never had any issues.

Can I Apply Miracle-Gro Lawn Food in a Drought?

It is best to avoid applying Miracle-Gro Lawn Food during a drought, as the lack of water may reduce its effectiveness. I suggest you wait until normal rainfall returns or until you can provide sufficient irrigation water to ensure the product is absorbed into the lawn.

When and How Often Should it be Applied?

Miracle-Gro Lawn Food can be applied monthly from April to October but it’s best to avoid periods of drought and I prefer to switch to a low-nitrogen feed from the end of summer onwards.

It can be applied via a watering can or mixer.

What If I Use Too Much Lawn Feed by Mistake?

In most cases, this shouldn’t cause any long-term effects.

I would water the lawn as much as possible as quickly as possible to dilute it but you may need to overseed the affected area if there’s any damage, and water that regularly until the lawn has recovered.

Will Miracle-Gro Help Grass Recover From Dog Urine?

Dog urine scorches grass because of its high nitrogen content, so applying a product such as Miracle-Gro, which also has high levels of nitrogen in it, won’t help.

I’ve found it best to water in any dog urine as quickly as possible. If that isn’t possible, I’ve found the best approach is to dig out and replace the soil to a few inches and overseed.

More information about dog lawn burns here.

Meet The Author: Daniel Woodley

Daniel has over 18 years of experience in the construction, home improvement, and landscape garden industries.

He previously worked as a project manager and has experience in managing teams of tradespeople and landscape gardeners on both small and medium sized projects.

Daniel is also a keen gardener and enjoys growing unusual plants and tending to his lawn.

More About Daniel Woodley.

Daniel Woodley

Why You Can Trust Us: Our Experience, Backed by a Qualified Horticulturist

We follow a detailed, rigorous process to create content that is helpful, factually correct and meets the highest standard of integrity.

Our 5-step process is:

1) We select a topic that we feel will help our readers.

2) The author creates the content based on their knowledge and experience of the subject. Daniel Woodley tested Miracle-Gro Lawn Food in this case and also wrote about his experience.

3) We then ask an expert with qualifications in the relevant area to fact-check and review the content, which we update accordingly, if applicable.

4) The content is checked by the site owners and published.

5) We review the content yearly to ensure it’s still correct and relevant.

This guide was reviewed and fact-checked by Elizabeth Smith, who is a qualified horticulturist.

Explore: Elizabeth’s profile and qualifications.

Explore More of Our Content Below:

Our Lawn Care Guides

Let us help you grow the perfect garden lawn. We have over a dozen detailed guides for lawn care including many with step-by-step instructions. Start Here

Best Lawn Weed Killers

These lawn weed killers work, I know because I tested them on my lawn. Get rid of weeds and let your lawn thrive with our suggestions Start Here

Grass Seed For Shade

Grass needs sunlight to thrive but these varieties cope well in shade. Got a north facing garden? You should try these grass seeds. Start Here

This guide to the Miracle-Gro was published by DIY Gardening

About Us