GS Plant Foods Liquid Kelp Fertilizer - OMRI Listed Seaweed

In this review of GS Plant Foods Liquid Kelp Fertilizer the bottom line is simple: this is a versatile, organic seaweed concentrate best suited to gardeners who want a gentle, nutrient-rich tonic to support soil health and plant vigor. The product stands out because it is OMRI listed, meaning it fits into certified organic programs, and one gallon of concentrate mixes into a large volume of solution for repeated treatments without complicated dosing. It performs well as a routine boost for vegetables, ornamentals and lawns and is easy to apply with common sprayers.

Key Features

• OMRI Listed for Organic Use: Certified for organic gardening and farming, giving growers confidence it meets organic standards.
• Seaweed Source: Made from Ascophyllum Nodosum, providing trace minerals and organic compounds that support overall plant nutrition.
• Soil Health Support: Helps maintain favorable soil conditions and can assist plants in accessing nutrients already present in the soil.
• Wide Plant Compatibility: Safe for vegetables, fruits, ornamentals, lawns, trees and shrubs, making it useful across a mixed garden or landscape.
• Simple Application: Mix 2 ounces per gallon of water for foliar or soil application, allowing flexible use with a sprayer, watering can or hose-end sprayer.
• Economical Coverage: One gallon of concentrate can make up to 800+ gallons of solution, stretching supply for seasonal use.

Who It's For

This product is aimed at home gardeners, small-scale growers and lawn care enthusiasts who want an organic, easy-to-use seaweed extract to incorporate into a regular fertility program. It fits well with people managing mixed beds of vegetables and ornamentals or who rotate between foliar feeding and soil drenches.

Those who should look elsewhere include growers seeking a high-NPK synthetic fertilizer for rapid heavy feeding, or anyone who is sensitive to strong natural odors; several users mention a pronounced smell that might be off-putting indoors or in enclosed spaces.

Pros & Cons

Pros

• OMRI listing ensures compatibility with certified organic practices and programs.
• Contains trace minerals and organic compounds that customers report improve plant growth and health.
• Flexible dilution and application methods make it easy to add to existing routines and equipment.
• Concentrated formula offers strong value by producing a large volume of usable solution.

Cons

• Not a replacement for balanced NPK fertilizers when plants need heavy macronutrient feeding.
• Some users report a strong odor that may be unpleasant during mixing or application.

Specifications

Brand	GS Plant Foods
Primary ingredient	Ascophyllum Nodosum seaweed extract
Listing	OMRI Listed for organic use
Mixing rate	2 oz per gallon of water
Coverage	Makes up to 800+ gallons of solution (treats up to 1,000 sq. ft. per gallon of solution)
Suitable for	Vegetables, fruits, ornamentals, lawns, trees, shrubs

Our Verdict

GS Plant Foods Liquid Kelp is a sensible buy for gardeners who want an organic, multiuse seaweed tonic that feeds soil biology and supports nutrient uptake. It is particularly good for routine maintenance and recovery of stressed plants, and the concentrated format delivers solid value. If you need immediate heavy NPK feeding or cannot tolerate natural odors, consider supplementing or choosing a different product.

Frequently Asked Questions

How do I mix and apply this kelp fertilizer?
Mix 2 ounces of concentrate per gallon of water and apply as a foliar spray or soil drench using a sprayer, watering can or hose-end sprayer.

Is this product approved for organic gardening?
Yes, it is OMRI listed for organic use and suitable for certified organic gardens and farms.

Will this replace my regular fertilizer?
It is best used as a supplement to support soil health and nutrient availability rather than a full replacement for fertilizers that supply primary macronutrients like nitrogen, phosphorus and potassium.