Liquid Kelp Fertilizer for Organic Growing - 5 Gallons

In this review of GS Plant Foods Liquid Kelp Fertilizer, the bottom line is simple: it is a concentrated, OMRI listed seaweed extract best suited for gardeners, small farmers, and home growers who want a reliable organic biostimulant to improve plant vigor and root strength. The reviewer found the product particularly effective at encouraging rapid growth and greening when used at recommended rates, and it stands out for being derived from Ascophyllum nodosum and compliant with the National Organic Program. It is a working tool for improving nutrient uptake and stress tolerance rather than a quick chemical feed.

Key Features

• OMRI Listed & Suitable for Organic Growing: Certified for organic use, it can be used in organic production under National Organic Program requirements, giving growers confidence about compliance.
• Natural Seaweed Extract: Made from Ascophyllum nodosum, it supplies naturally occurring trace nutrients and compounds that enhance chlorophyll and plant metabolism.
• Feeds from the Roots Up: Formulated to support root development and soil health, which helps plants establish stronger, more resilient root systems.
• Promotes Plant Resilience: Helps plants cope with stressors like heat, drought, and poor soil, improving overall vitality during challenging conditions.
• Boosts Flowering & Growth: Regular use can improve bloom quality and productivity in vegetables, flowers, lawns and shrubs by supporting nutrient uptake and growth processes.

Who It's For

This product is aimed at organic gardeners, raised-bed growers, landscapers, and small-scale farmers who want a natural biostimulant to complement organic fertility programs. It works well for anyone growing vegetables, ornamentals, lawns or shrubs who values improved root health and stress resistance.

Those who rely on quick-release chemical fertilizers for immediate, high-N responses or who are sensitive to strong marine odors may want to consider alternative liquid feeds; the fertilizer has a pronounced seaweed smell noted by several users.

Pros & Cons

Pros

• OMRI listed and suitable for organic use, offering regulatory assurance for organic producers.
• Contains natural Ascophyllum nodosum extract that supports chlorophyll production and plant vigor.
• Easy to mix and apply in sprayers, providing a practical option for routine feeding and foliar use.
• Helps plants recover and grow quickly, with users reporting visible improvements in growth and health.

Cons

• Strong marine odor can be unpleasant to some users during mixing and application.
• As a biostimulant, results are gradual and complementary to a broader fertility program rather than an instant nutrient fix.

Specifications

Brand	GS Plant Foods
Formulation	Liquid seaweed concentrate
Source	Ascophyllum nodosum
Certification	OMRI Listed; suitable for organic growing
Intended Use	Lawns, gardens, vegetables, flowers, shrubs
Volume	5 gallons

Our Verdict

For organic growers seeking a reliable seaweed biostimulant, this 5 gallon liquid kelp is a solid value: it supports root growth, improves stress tolerance and enhances flowering when used correctly. The strong marine smell and the need for integration into a full fertility plan are the main trade-offs, but for most gardeners and small growers the performance and OMRI listing make it a worthwhile investment.

Frequently Asked Questions

Is this fertilizer suitable for organic gardens?
Yes. The product is OMRI listed and meets National Organic Program requirements for use in organic production.

How is the product applied?
It is a liquid concentrate that can be mixed with water and applied to the soil or used as a foliar spray at recommended rates.

Will it replace regular fertilizer?
No. It is a biostimulant that improves nutrient uptake and plant resilience and works best when used alongside a balanced fertility program.