Tree & Shrub Fertilizer 18-4-6 | Strong Roots + Lush Growth

The Lawn Medic | Specialized fertilizer that supports strong root systems and vigorous plant growth.

★★★★★ 4.8 stars on over 5,000 orders

Tree & Shrub Fertilizer 18-4-6 | Strong Roots + Lush Growth

$29.00

"Our lawn looked great with The Lawn Medic's products so we thought we'd try their plant products as well, and everything is looking better than ever!" - Samantha K.

Bag Size: 2kg

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Support long-term health in trees and shrubs with a reliable, root-friendly feed. This 18-4-6 blend helps promote strong growth, better leaf colour, and healthier root development for landscapes and ornamentals.

Best For

Established trees and shrubs, new landscape plantings, and seasonal feeding in spring or early summer.

What Makes It Different

The difference is targeted nutrition for woody plants, supporting both canopy growth and long-term root health. Trees and shrubs respond best to steady, balanced feeding—not extreme swings. This formula provides enough nitrogen for lush foliage while still supporting roots and plant strength. It’s a practical option for maintaining healthier ornamentals with better colour, vigor, and stress tolerance over time.

Application Rate

9.3 kg per 1,000 sq ft. Water in well after applying.

Minimum Guaranteed Analysis

• Total Nitrogen 18% (Urea 17.2%, Ammoniacal 0.8%; 13% controlled-release N)
• Available Phosphate (P2O5) 4%
• Soluble Potash (K2O) 6%
• Sulfur 0.2%
• Iron 1.0%
• Chlorine 4.56%
• Polyurethane 0.3%

Product Details

NPK | 18-4-6
Nitrogen Release | Slow | 80% 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.

Pairs well with

In stock! Ships within 1-2 business days.

Expedited shipping on all orders.

Only professional grade fertilizers.

30-Day Return Policy

Tree & Shrub Fertilizer 18-4-6 | Strong Roots + Lush Growth

2kg

$29.00

Why This Fertilizer?

Trees and shrubs require steady nutrition to maintain healthy growth and strong root systems. This fertilizer provides nitrogen for leaf and canopy development, while phosphorus supports root expansion and establishment. Potassium helps strengthen plants and improve resistance to environmental stress. Regular fertilization encourages stronger growth, improved foliage colour, and better long-term plant health.

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.