All-Natural 5-1-3 Fertilizer with Kelp | Organic Growth

Organic all natural fertilizer bag with kelp 5-1-3

The Lawn Medic | Natural-based fertilizer with kelp biostimulants that supports steady growth while improving heat and drought tolerance.

★★★★★ 4.8 stars on over 5,000 orders

All-Natural Lawn Fertilizer 5-1-3 + Kelp | Summer Stress

$29.00

Organic Made for Canada Pro Grade Spreader Ready Kelp SGN 200-250 Regular Prill

"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 466 sq ft

In stock, ready to ship

Pickup available at Pickup Location UPS STORE

Usually ready in 24 hours

100% Organic

A completely organic fertilizer that provides your lawn important nutrients without synthetic products. It can be used individually or part of a full season organic program.

Feed the soil to feed the lawn. This organic-based formula doesn't just push green growth; it builds the microbial life in your soil. The addition of Kelp acts as a natural "vitamin boost," helping your lawn handle the stress of Canadian summers.

5-1-3

NPK

Reg - SGN 200-250

Prill Size

Granular

Application Type

Slow - 100% Organic

Nitrogen Release

Best For

Spring and early summer feeding, routine maintenance, and improving thin lawns.

What Makes It Different

Unlike many synthetic fertilizers that focus only on quick growth, this formula combines natural nutrient sources with kelp biostimulants that support long-term plant health. Kelp contains naturally occurring growth regulators and trace elements that help plants handle stress. By supporting soil biology and plant resilience rather than forcing rapid growth, this fertilizer helps lawns stay healthier during challenging summer conditions.

Application Rate

4.3kg (9.5lbs) to 8.6kg (19lbs) per 1000sqft per application

Minimum Guaranteed Analysis

• Total Nitrogen (N) – 5%
• Available Phosphoric Acid (P₂O₅) – 1%
• Soluble Potash (K₂O) – 3%
• Calcium (Ca) – 5%
• Magnesium (Mg) – 3%

Product Details

NPK | 5-1-3
| | 100% All Natural 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

All-Natural Lawn Fertilizer 5-1-3 + Kelp | Summer Stress

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?

This natural-based fertilizer is designed to feed lawns while helping them withstand the challenges of summer. The balanced nutrient profile provides steady nutrition without excessive top growth, while kelp extracts supply natural biostimulants that encourage stronger root systems and improved stress tolerance. Kelp has long been used in turf management because it supports plant health during periods of heat, drought, and heavy use. This formula is ideal for maintaining steady growth and improving resilience when lawns are under environmental stress.

Technical Details

Organic fertilizers contribute nutrients while simultaneously improving soil biological activity. Research conducted through the University of Guelph Turfgrass Institute has shown that organic nutrient sources can increase microbial activity within the turfgrass rhizosphere, enhancing nutrient cycling and improving soil structure over time. Increased microbial activity improves the gradual release of nitrogen and other nutrients, supporting steady plant growth without the rapid flush associated with highly soluble fertilizers.

The addition of kelp extract introduces naturally occurring plant growth regulators such as cytokinins and betaines. Studies summarized by the Penn State Center for Turfgrass Science indicate that seaweed-derived biostimulants can stimulate root growth and improve turf recovery following drought and heat stress. By combining organic nutrition with kelp-based biostimulants, this formulation supports both plant health and soil biology during periods of environmental stress.

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.