N-Ext Sea-K Sea Kelp Bio-Stimulant 0-0-5

Name: N-Ext Sea-K Sea Kelp Bio-Stimulant 0-0-5
Brand: Greene County Fertilizer
SKU: NXTSEAKQ
Price: 44.99 USD
Availability: InStock

Highly concentrated North Atlantic sea kelp bio-stimulant. Contains auxins, gibberellins, and cytokinins. One quart covers up to 64,000 sq ft. Known in the professional community as premium microbe food.

$44.99

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Greene County Fertilizer N-Ext Sea-K Sea Kelp Bio-Stimulant 0-0-5

$44.99

Green Grass. No Weeds.

Information & Specifications

About This Product

Concentrated Sea Kelp That Feeds Your Soil Biology

N-Ext Sea-K is one of the most concentrated sea kelp products available to DIY homeowners. Derived from cold North Atlantic waters, it contains high concentrations of three plant growth hormones: auxins, gibberellins, and cytokinins. These hormones deepen color, increase rooting, improve pest resistance, protect against drought, and reduce plant senescence.

One quart covers up to 64,000 square feet. That coverage rate is not a misprint. Sea-K is extremely concentrated, which is why it is sold in quart size only and why professional applicators refer to it as premium microbe food.

Who Sea-K Is For

Experienced lawn care enthusiasts who are already running a fertility program and want to add a high-end bio-stimulant layer. Sea-K is not a starter product. It is the product you add once your nitrogen, root health, and soil conditioning are already dialed in and you want to push results further.

If you are building a program from scratch, start with RGS and a nitrogen source first. Add Sea-K after the foundation is established.

Temperature Matters

Apply Sea-K when outdoor temperatures are below 85 degrees Fahrenheit. If applying during warm months, do so in early morning or evening. The concentrated sea kelp can cause temporary leaf stress if applied in direct midday sun during peak heat. Follow the temperature guidance and the product performs exceptionally well.

Active Ingredients

Sea kelp (Auxins, Gibberellins, Cytokinins), trace elements and minerals

Grass Types

All warm and cool season grasses

Best Timing

Spring through fall

01

When to Apply

Apply monthly during the growing season when temperatures are below 85 degrees. Early morning or evening applications during warm months avoid temporary leaf stress from midday heat. Sea-K works spring through fall as an additive to your existing fertility program. It is not a standalone product.

02

How to Apply

Apply with a pump or battery-powered sprayer for precise coverage. Can also be used with a quart-size hose-end sprayer. Water in after application. Sea-K is an additive to your current program, not a replacement. Apply as a separate pass or tank-mix with compatible N-Ext products.

03

What to Expect

Deeper color response within 5 to 7 days as the growth hormones stimulate chlorophyll production. Improved stress tolerance over consecutive applications. Soil microbial activity increases as the kelp serves as a food source for beneficial organisms. Results are most visible when Sea-K is layered on top of an established fertility program.

01

When to Apply

Apply monthly during the growing season when temperatures are below 85 degrees. Early morning or evening applications during warm months avoid temporary leaf stress from midday heat. Sea-K works spring through fall as an additive to your existing fertility program. It is not a standalone product.

02

How to Apply

Apply with a pump or battery-powered sprayer for precise coverage. Can also be used with a quart-size hose-end sprayer. Water in after application. Sea-K is an additive to your current program, not a replacement. Apply as a separate pass or tank-mix with compatible N-Ext products.

03

What to Expect

Deeper color response within 5 to 7 days as the growth hormones stimulate chlorophyll production. Improved stress tolerance over consecutive applications. Soil microbial activity increases as the kelp serves as a food source for beneficial organisms. Results are most visible when Sea-K is layered on top of an established fertility program.

Frequently Asked Questions

Answers to the most commonly asked questions about this product:

Why is Sea-K only available in quart size?

Because one quart covers 64,000 square feet. At that concentration, a quart provides 8 to 12 monthly applications for a typical suburban lawn. A gallon would last most homeowners 2 to 3 full growing seasons. The quart size is the right volume for the concentration level.

What does microbe food mean?

Sea kelp provides carbon compounds, amino acids, and trace minerals that beneficial soil microorganisms feed on. When soil biology is well-fed, it processes nutrients more efficiently, breaks down organic matter faster, and supports healthier root growth. Sea-K elevates soil microbial activity, which makes your entire soil ecosystem work better.

Can Sea-K replace RGS?

No. Sea-K and RGS serve different functions despite both containing sea kelp. RGS is formulated specifically for root growth stimulation with a different kelp extract profile and higher humic acid content. Sea-K is a concentrated bio-stimulant and microbe food source. They complement each other but are not interchangeable.

What happens if I apply in temperatures above 85 degrees?

The concentrated sea kelp can cause temporary leaf tip burn if applied in direct sun during peak heat. The lawn recovers within a week, but the cosmetic damage is avoidable. Apply in early morning or evening when temperatures are cooler. The product performance is identical regardless of application time.

Our customer support is available Monday to Friday: 8am-8:30pm.Average answer time: 24h