Fall Root Builder 9-18-18 | Strength & Winter Prep Fertilizer

Fall root builder fall fertilizer 9-18-18

The Lawn Medic | Balanced fall fertilizer designed to strengthen roots before winter.

★★★★★ 4.8 stars on over 5,000 orders

Fall Root Builder 9-18-18 | Strength + Winter Prep

$39.00

Homogeneous Granules SGN 90 Micro Prill Made for Canada Pro Grade Spreader Ready Kelp

"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 1323 sq ft

In stock, ready to ship

Pickup available at Pickup Location UPS STORE

Usually ready in 24 hours

Homogeneous Granules

An advanced formulation where every granule contains the full nutrient blend. Unlike typical fertilizers with separate nutrient particles, this ensures the most even application possible.

A fall essential when you want roots and resilience—not a growth surge. This 9-18-18 root builder supports establishment, recovery, and winter hardiness so your lawn comes back stronger in spring.

9-18-18

NPK

Micro - SGN 90

Prill Size

Granular

Application Type

Balanced - 50% Slow Release

Nitrogen Release

Best For

Fall feeding, overseeding projects, and strengthening turf before winter.

What Makes It Different

Unlike most fertilizers that focus on summer growth, this fall formula is designed to improve root strength and winter readiness. The nutrient balance supports carbohydrate storage and root development instead of pushing excess top growth. The higher potassium strengthens turf cells and improves resilience heading into winter. It’s a seasonal-purpose fertilizer: built for fall timing, not general feeding.

Application Rate

1.5kg (3.3lbs) to 2.5kg (5.5lbs) per 1000sqft per application

Minimum Guaranteed Analysis

• Total Nitrogen (N) – 9%
• Available Phosphoric Acid (P₂O₅) – 18%
• Soluble Potash (K₂O) – 18%
• Calcium (Ca) – 1.4%
• Magnesium (Mg) – 0.7%

Product Details

NPK | 9-18-18
Nitrogen Release | Balanced | 50% Slow Release Nitrogen
Prill Size | Micro Prill | SGN 90 | The smallest prill size offering the most even and fastest results
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

Fall Root Builder 9-18-18 | Strength + Winter Prep

2kg

$39.00

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

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Why This Fertilizer?

Fall Root Builder fertilizers are designed to strengthen turfgrass as it prepares for winter dormancy. During the fall season, turfgrass shifts its energy toward root growth and carbohydrate storage rather than leaf production. The phosphorus in this formula supports continued root development, while potassium strengthens plant tissues and improves stress tolerance. These nutrients help turfgrass store energy reserves that support survival during winter and promote faster green-up in spring. Applying a root-focused fertilizer in the fall helps lawns recover from summer stress while building a stronger foundation for the following growing season.

Technical Details

Fall fertilization programs are designed to strengthen turfgrass before winter dormancy. During cooler temperatures, turfgrass plants allocate energy toward root growth and carbohydrate storage rather than leaf production. Research conducted through the University of Wisconsin Turfgrass Science Program shows that fall fertilization improves winter survival and spring recovery.

Providing phosphorus and potassium during this period supports root development and plant strength. These nutrients help turfgrass store energy reserves that fuel early spring growth.

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.