Humic Acid, Fulvic Acid, Seaweed Kelp
PRO-LINE HFK-633 Root Growth Stimulant
PRO-LINE HFK-633 Root Growth Stimulant
PRO-LINE HFK-633 Root Growth Stimulant
PRO-LINE HFK-633 Root Growth Stimulant
PRO-LINE HFK-633 Root Growth Stimulant
PRO-LINE HFK-633 Root Growth Stimulant
PRO-LINE HFK-633 Root Growth Stimulant
PRO-LINE HFK-633 Root Growth Stimulant
Humic Acid, Fulvic Acid, Seaweed Kelp
PRO-LINE HFK-633 Root Growth Stimulant
PRO-LINE HFK-633 Root Growth Stimulant
PRO-LINE HFK-633 Root Growth Stimulant
PRO-LINE HFK-633 Root Growth Stimulant
PRO-LINE HFK-633 Root Growth Stimulant
PRO-LINE HFK-633 Root Growth Stimulant
PRO-LINE HFK-633 Root Growth Stimulant
PRO-LINE HFK-633 Root Growth Stimulant

PRO-LINE HFK-633 Root Growth Stimulant

$39.95 $29.95 Save 25%
/
Shipping calculated at checkout.
  • Orders $49+ Ship Free
  • Results or Refund Guarantee
  • 100% Secure Checkout
  • In stock, ready to ship
Size
Guaranteed Safe Checkout

Covington Humic Acid, Fulvic Acid, Kelp Seaweed Fertilizer, PRO-LINE HFK-633: Superior Potassium Nitrate Root Growth Stimulant with Humic, Fulvic, and Kelp fertilizer for Plant & Tree Root Health


Welcome to the world of healthy and vibrant plants! Introducing Covington Naturals Humic Acid, Fulvic Acid, Seaweed Kelp Fertilizer - a powerful liquid bio-stimulant that will transform your plants and lawns into thriving beauties.  



✔️ POTASSIUM NITRATE POWERED: Enhances the rooting body and depth of your plants.

✔️ Humic Acid Infused: Provides essential nutrients for plant growth and improves soil structure.

✔️ Seaweed Extract: Aids in stress resistance, particularly from heat and drought.

✔️ Versatile Use: Suitable for all plant types – flowers, vegetables, fruits, trees, and more.

✔️ Organic and Safe: Made from natural ingredients, it's safe for your plants and the environment. Easy to Use: Comes in liquid form for easy application and quick absorption.


Boost your plants' health and productivity with Covington Naturals HFK-633. This powerful root growth stimulant is formulated with the highest quality potassium nitrate, humic acid, and seaweed extract. Perfect for all types of plants, this product is designed to enhance root body and depth while reducing stress from heat and drought. It's an ideal choice for gardeners seeking organic and effective solutions for their plants.



Our Soil & Plant Formula is designed to increase the rooting body and depth while decreasing stress pressure caused by heat and drought. Studies have shown you will use less water. This biologically active material contains Humic Acids and Sea Kelp to provide micronutrient food. With this powerful combination, your lawn and garden is sure to thrive! 

APPLICATION: This product is intended to be used as an additive to your fertilizer program. For best results apply 4 times per year at a minimum rate of 3 ounces per 1,000 sq. ft. and a maximum of 6 ounces per 1,000 sq. ft.

Apply when turf grass variety is actively growing. Dilute with enough water to cover 1 acre. Do not apply with less than a 7:1 dilution with water. Product can be applied year-round at 3 ounces per 1,000 sq. ft. Do not exceed 3 oz./1000 sq. ft. when daytime temps are above 85 degrees. When mixing with liquid fertilizers in TANKS apply 1. Water 2. HFK-633 3. Fertilizer or Aerator and Mix.

The advantage of using a blend of potash, humic acid, fulvic acid, and sea kelp as fertilizer is that it provides plants and grass with a rich combination of essential nutrients and minerals, which can significantly enhance their growth, resilience, and overall health.

If you're not satisfied, we're not satisfied.

That's why we'll happily refund any CovingtonNaturals.com purchase within 90 days. Read More.

Free Standard Shipping on Residential Orders Over $49

Orders for in-stock merchandise are normally shipped next business day for delivery 3-8 business days after the order is received, depending on your geographic location. Orders are shipped via UPS or USPS.


Free shipping specials are only available for orders shipping to addresses within the 48 Contiguous States.

This site is protected by hCaptcha and the hCaptcha Privacy Policy and Terms of Service apply.

Customer Reviews

Based on 2 reviews
50%
(1)
0%
(0)
0%
(0)
0%
(0)
50%
(1)
D
Don Wlllis
still have not received order

I ordered a gallon of growth stimulant and still have not rec'd it! Order was confirmed on 12/2/25 and shows that a shipping label was made but they did not show picking it up. I have sent 2 emails to customer and even called and talked to someone but claimed he was driving his truck and would take care of it. I have received any confirmation as to if or when anything is going to be done!!!!!!! Very dissatisfied customer!!!!!!!!

Don Willis

R
Rick Brueggemann
HFK 633

Been using your products for the past 6 months on a new sod lawn.
Your office suggested I try HFK 633 and sent a bottle a long, no charge.
Will give it a try and let you know.
This is why I like dealing with the owners.

Thanks again.
Rick Brueggemann
[****]
[****]

Recently viewed

Customer Reviews

Based on 2 reviews
50%
(1)
0%
(0)
0%
(0)
0%
(0)
50%
(1)
D
Don Wlllis
still have not received order

I ordered a gallon of growth stimulant and still have not rec'd it! Order was confirmed on 12/2/25 and shows that a shipping label was made but they did not show picking it up. I have sent 2 emails to customer and even called and talked to someone but claimed he was driving his truck and would take care of it. I have received any confirmation as to if or when anything is going to be done!!!!!!! Very dissatisfied customer!!!!!!!!

Don Willis

R
Rick Brueggemann
HFK 633

Been using your products for the past 6 months on a new sod lawn.
Your office suggested I try HFK 633 and sent a bottle a long, no charge.
Will give it a try and let you know.
This is why I like dealing with the owners.

Thanks again.
Rick Brueggemann
[****]
[****]