N-Ext Sea-K™ is a highly concentrated liquid sea kelp bio-stimulant designed to support tired soils, stressed lawns, healthy rooting, and overall turf performance. Often referred to as “microbe food” by professional applicators, Sea-K provides concentrated sea kelp, naturally occurring plant hormones, trace elements, and minerals to give your lawn care program an added boost.
With a 0-0-5 N-P-K analysis, Sea-K can help support deeper lawn color, stronger root and rhizome development, improved nutrient uptake, drought protection, and overall turf resilience. It can be used as a standalone lawn bio-stimulant or incorporated into a complete fertilizer and soil health program.
Sea-K is highly concentrated and budget-friendly. One quart covers up to 64,000 sq. ft. at the low application rate, making it an economical choice for regular monthly lawn care. It is safe for use on all major turf types and ornamental plants.
What is N-Ext Sea-K, and how does it help stressed lawns?
Sea-K™ is a 0-0-5 sea kelp bio-stimulant designed to support tired soils and stressed lawns. It contains concentrated North Atlantic sea kelp, naturally occurring trace elements, and plant compounds including auxins, gibberellins, and cytokinins. Regular applications may help promote deeper color, stronger root development, nutrient uptake, drought protection, and improved turf stress tolerance.
How do you apply Sea-K bio-stimulant to your lawn?
For precise application, mix 1/2 oz of Sea-K into a gallon of water and apply it evenly with a pump or battery-powered sprayer. Water the product into the soil with at least ¼ inch of rainfall or irrigation within 24 hours. Avoid applying Sea-K when the lawn is saturated.
How much lawn does one quart of Sea-K cover?
One 32 oz quart of Sea-K covers 64,000 square feet when applied at the label rate of ½ ounce per 1,000 square feet.
Can Sea-K be used on all grass types, and how often should it be applied?
Yes! Sea-K can be used on cool-season grasses such as Kentucky bluegrass, turf-type tall fescue, and ryegrass, as well as warm-season grasses including Bermuda, St. Augustine, zoysia, centipede, and Bahia. It is also labeled as safe for ornamental plants. Apply Sea-K every 30 days, preferably when temperatures are below 85°F; during hot weather, apply in the early morning or evening.
| Shipping |
Shipping is included for most states within the U.S. No P.O. Boxes. Not available in Oregon, California, Alaska or Hawaii. |
| Delivery Time | 4–7 business days |
| Returns | All sales are final; no cancellations, returns, or exchanges. |
| Customer Support | Contact Yard Mastery Support |
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