Starter Fertilizer 16-32-6 | Root Builder for Seed & Sod

The Lawn Medic | High-phosphorus starter fertilizer that supports rapid root development in new lawns.

★★★★★ 4.8 stars on over 5,000 orders

Starter Lawn Fertilizer 16-32-6 | Root Builder

$49.00

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

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

Bag Size: 5kg

2kg
5kg
10kg

Product variants

Coverage (selected size)

Covers up to 4400 sq ft

In stock, ready to ship

Pickup available at Pickup Location UPS STORE

Usually ready in 24 hours

Slow Release Formula

Featuring an advanced slow release coating producing long last results and on going growth.

Give new grass the best start possible. This 16-32-6 starter fertilizer delivers high phosphorus for rapid root development, helping seed and sod establish faster and handle stress better.

16-32-6

NPK

Reg - SGN 200-250

Prill Size

Granular

Application Type

Balanced - 50% Slow Release

Nitrogen Release

Best For

Spring applications, new seeding, overseeding, sod installs, and any time you’re repairing bare spots.

What Makes It Different

Unlike standard maintenance fertilizers that prioritize top growth, this starter formula is designed specifically for establishment success. The elevated phosphorus level targets rapid root development at the exact time new seedlings need it most. That matters because better early roots improve drought tolerance, reduce failure risk, and help the lawn fill in faster. It’s a true “project fertilizer” meant for seeding, overseeding, and sod—not general feeding.

Application Rate

1.1kg (2.5lbs) to 1.7kg (3.8lbs) per 1000sqft per application

Minimum Guaranteed Analysis

• Total Nitrogen (N) – 16%
• Available Phosphoric Acid (P₂O₅) – 32%
• Soluble Potash (K₂O) – 6%

Product Details

NPK | 16-32-6
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

Starter Lawn Fertilizer 16-32-6 | Root Builder

5kg

$49.00

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?

Starter fertilizers are specifically formulated to help new lawns establish strong root systems during the early stages of growth. The high phosphorus content in this formula encourages rapid root development, which is critical when seeding or laying new sod. Strong roots allow young plants to access more water and nutrients, helping them establish faster and develop into a dense, healthy lawn. This type of fertilizer is an essential part of successful lawn establishment and renovation projects.

Technical Details

Starter fertilizers are designed specifically to support turfgrass establishment and renovation. Young turf plants require high phosphorus availability to support root development and early metabolic activity. Research conducted through the University of Wisconsin Turfgrass Science Program has demonstrated that phosphorus fertilization improves root growth and establishment success in new lawns.

Providing adequate phosphorus during establishment helps plants develop deeper root systems capable of accessing water and nutrients more effectively. Studies from the Penn State Center for Turfgrass Science indicate that strong root development improves long-term turf density and resilience.

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.