Nitro Iron 24-0-4 Lawn Fertilizer | Dark Green & Dense Growth

Nitro Iron nitrogren fertilizer bag 24-0-4

The Lawn Medic | Nitrogen and iron fertilizer designed to rapidly deepen turf colour and density.

★★★★★ 4.8 stars on over 5,000 orders

Nitro Iron Lawn Fertilizer 24-0-4 | Dark Green

$29.00

Pro Grade Made for Canada SGN 200-250 Regular Prill Iron Slow Release Nitrogen

"The fertilizer worked amazing. Lawn was super green all year. Will definitely be purchasing again." - Brent S.

Bag Size: 2kg

2kg
5kg
10kg

Product variants

Coverage (selected size)

Covers up to 1409 sq ft

In stock, ready to ship

Pickup available at Pickup Location UPS STORE

Usually ready in 24 hours

Iron Additive

Featuring Iron to help darken your lawn while providing it with required nutrients.

Push greener colour and thicker growth in one shot. This 24-0-4 nitrogen-forward blend pairs strong feeding with iron support to keep your lawn looking dark, dense, and healthy.

24-0-4

NPK

Reg - SGN 200-250

Prill Size

Granular

Application Type

Balanced - 50% Slow Release

Nitrogen Release

Best For

Spring and summer feeding, improving thin lawns, and homeowners who want a darker finish.

What Makes It Different

This formula combines nitrogen for growth with iron for deep colour, creating a fertilizer designed specifically for visual lawn quality. Nitrogen drives turf density and growth, while iron enhances the dark green colour that many homeowners want. The combination allows lawns to look healthier without relying solely on high nitrogen levels.

Application Rate

1.4kg (3lbs) to 2.4kg (5lbs) per 1000sqft per application

Minimum Guaranteed Analysis

• Total Nitrogen (N) – 24%
• Soluble Potash (K₂O) – 4%
• Iron (Fe) – 1%
• Sulfur (S) – 0.2%

Product Details

NPK | 24-0-4
Nitrogen Release | Balanced | 50% Slow Release Nitrogen
Prill Size | Regular Prill | SGN 200-250 | Standard prill size for all applications
Application Type | Granular | Apply with any lawn spreader

Storage & Handling & Safety

Storage

We recommend keeping your seed in a cool dry location, especially after opening. This helps to maintain a high germination rate for an extended period of time.

Handling

Seed is safe to handle. However if you are sensitive to airborne particles you may want to wear a mask when adding your seed to a spreader for instance.

Shipping & Returns

Shipping

We ship Canada wide. Most orders are shipped with UPS. Canada Post is used for some locations.

Shipping on Grass Seed is always free. Shipping on fertilizers is calculated based on weight.If your order combines seeds and fertilizers you will only be charged for the weight of the fertilizer. We do our best to offer a balance between fast shipping and reasonable shipping rates.

We strive to ship all orders within 24hrs (48hours max).

Please reach out to use if you have any questions.

Returns

All of our products can be returned within 30 days as long as it is unopened/unused.

If you have a concern with your product after opening it please reach out to use as we always work to find a solution and rectify any issues.

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Valid on individual fertilizers only. Grass seed is always free shipping.

Pairs well with

In stock! Ships within 1-2 business days.

Expedited shipping on all orders.

Only professional grade fertilizers.

30-Day Return Policy

Nitro Iron Lawn Fertilizer 24-0-4 | Dark Green

2kg

$29.00

A Better lawn starts here

Don't Take Our Word For It

See what our happy customers are saying about how The Lawn Medic helped their lawns.

See All Our Reviews

Expedited Shipping on All Orders

Why This Fertilizer?

Nitro Iron fertilizers combine two key nutrients responsible for lawn appearance: nitrogen and iron. Nitrogen promotes healthy leaf growth and turf density, helping lawns fill in and maintain strong canopy coverage. Iron enhances chlorophyll production, which deepens the natural green colour of turfgrass without dramatically increasing growth rates. This combination allows homeowners to achieve a darker, healthier-looking lawn while still supporting steady turf development. Nitro Iron fertilizers are often used when lawns appear pale or thin and need both improved colour and moderate growth support. By combining nitrogen with iron, this formula delivers both visual improvement and improved turf vigor.

Technical Details

Nitrogen and iron are two of the most influential nutrients affecting turfgrass colour. Nitrogen drives chlorophyll production and leaf growth, while iron enhances chlorophyll synthesis and intensifies turf pigmentation. Research conducted through the Michigan State University Turfgrass Program has shown that combining nitrogen and iron applications can significantly improve turf colour and canopy density.

Iron supplementation allows turf managers to deepen lawn colour without dramatically increasing growth rates. Studies from the Penn State Center for Turfgrass Science demonstrate that iron applications are frequently used in professional turf management to enhance visual turf quality.

See the difference

Geoff D.

"I used seed and fertilizer from The Lawn Medic in the Spring. The transformation over about 5 weeks was incredible. The pictures tell the story. The new lawn came in thick and green and it has stayed that way all year. No weeds. Strong growth."

Testimonials

"Best result I've ever had in reseeding my lawn. No more big box branded lawn seed with pathetic results. Next fall will be the backyard's turn."
— Jose C.

"Lawn looks freaking awesome in December 😄😄 Will definitely be ordering again in the spring."
— Daryl F.

"Despite this summer’s heat and drought, the lawn stayed healthy. The seed quality is noticeably better than what I’ve bought from big-box stores."
— Ryan C.

FAQs

Please read our FAQs page to find out more.

What makes your products better?

All of our products, including our seeds and fertilizers, were developed for professional uses. This means that you are truly getting the best of the best when it comes to lawn care products. Forget the big box store products and try what the pros use.

Do you provide guides on how to use your products?

Yes, of course we do. Take a look at our Guides page. We will be adding more guides and helpful tools soon as well.

Can you help me decide what I need?

Yes! We are here to help. Contact us anytime with your questions and we will get back to you within 1-2 days with some suggestions. We also have our Guides page which can answer some questions, and we have more helpful tools coming soon.

How can I get your products?

We ship Canada wide by UPS and Canada Post (it depends on the location). Every shipment is expedited to arrive as soon as possible, and ships within 1-2 days. We also have a pickup location in Burlington, Ontario.