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Best kelp fertilizers - May 2026

Last Updated - May 26, 2026

1
Best Choice

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Down To Earth All Natural Fertilizers

Down To Earth All Natural Fertilizers Organic Kelp Meal - Plant Food with Seaweed (Ascophyllum nodosum), Potassium and Trace Minerals 1-0.1-2, 4 lb

Down To Earth All Natural Fertilizers

$39.99

More Details
Main highlights
- Stimulate root development, stops transplant shock, boosts growth and alleviates stress caused by fluctuations in temperatures
- Provides a rich natural source of Potash, trace minerals, amino acids and natural plant hormones
- Kelp Meal is pure Ascophyllum nodosum seaweed from the clean, cold waters of the North Atlantic Ocean and is an ideal nutrient supplement for all types of vegetables, herbs, flowers and perennials
- Hand-harvested, carefully dried and finely milled and is perfect for use in seeding mixes and potting soils, just use 1 - 2 pounds for 100 square feet of garden soil
- Down To Earth Kelp Meal is a 4 pound box of all natural fertilizer with 1-0.1-2 formula and is listed by the Organic Materials Review Institute (OMRI) for use in organic production
$39.99
2

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Down To Earth All Natural Fertilizers

Down To Earth All Natural Fertilizers Organic Kelp Meal - Plant Food with Seaweed (Ascophyllum nodosum), Potassium and Trace Minerals 1-0.1-2, 4 lb

Down To Earth All Natural Fertilizers

$39.99

More Details
Main highlights
- Stimulate root development, stops transplant shock, boosts growth and alleviates stress caused by fluctuations in temperatures
- Provides a rich natural source of Potash, trace minerals, amino acids and natural plant hormones
- Kelp Meal is pure Ascophyllum nodosum seaweed from the clean, cold waters of the North Atlantic Ocean and is an ideal nutrient supplement for all types of vegetables, herbs, flowers and perennials
- Hand-harvested, carefully dried and finely milled and is perfect for use in seeding mixes and potting soils, just use 1 - 2 pounds for 100 square feet of garden soil
- Down To Earth Kelp Meal is a 4 pound box of all natural fertilizer with 1-0.1-2 formula and is listed by the Organic Materials Review Institute (OMRI) for use in organic production
$39.99
3

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Bloom City

Bloom City Organic Liquid Seaweed and Kelp Fertilizer Supplement, Quart (32 oz) Concentrated Makes 180 Gallons

Bloom City

$19.99

More Details
Main highlights
- SIMPLE AND SAFE TO USE FOR ALL PLANTS: Add to every watering, it’s that easy. No risk of over application, plants love kelp. Clean Kelp aids in every stage of growth for root and stem health.
- FULLY ORGANIC SEAWEED AND KELP: A seven species blend of Ascophyllum Nodosum, Palmaria Palmata, Ecklonia Maxima, Laminaria Saccharina, Chlorella Vulgaris, Arthrospira Platensis, and Chondrus Crispus.
- FORMULATED AND MADE IN THE USA: Designed by botanists and plant chemists. Bloom City chooses only the highest quality ingredient sources and manufacturing methods to create the world’s best craft growing nutrient systems
- FOR BOTH PLANTS AND LAWNS: Add Clean Kelp to all of your houseplants, vegetable garden, and your lawn for healthy green plants.
- EXTRACTED TO PROTECT NATURAL ENZYMES: Clean Kelp’s unique processing techniques give the cleanest possible kelp extract. Get all the benefits of natural kelp enzymes and hormones without the non-nutritious fibrous pulp that gives other kelps their thick, brackish appearance. You can see the difference.
$19.99
4
Best Value
10% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Bloom City
10% Off

Bloom City Organic Liquid Seaweed and Kelp Fertilizer Supplement, Quart (32 oz) Concentrated Makes 180 Gallons

Bloom City

$17.99

$19.99
(10% Off)

More Details
Main highlights
- SIMPLE AND SAFE TO USE FOR ALL PLANTS: Add to every watering, it’s that easy. No risk of over application, plants love kelp. Clean Kelp aids in every stage of growth for root and stem health.
- FULLY ORGANIC SEAWEED AND KELP: A seven species blend of Ascophyllum Nodosum, Palmaria Palmata, Ecklonia Maxima, Laminaria Saccharina, Chlorella Vulgaris, Arthrospira Platensis, and Chondrus Crispus.
- FORMULATED AND MADE IN THE USA: Designed by botanists and plant chemists. Bloom City chooses only the highest quality ingredient sources and manufacturing methods to create the world’s best craft growing nutrient systems
- FOR BOTH PLANTS AND LAWNS: Add Clean Kelp to all of your houseplants, vegetable garden, and your lawn for healthy green plants.
- EXTRACTED TO PROTECT NATURAL ENZYMES: Clean Kelp’s unique processing techniques give the cleanest possible kelp extract. Get all the benefits of natural kelp enzymes and hormones without the non-nutritious fibrous pulp that gives other kelps their thick, brackish appearance. You can see the difference.
$17.99
$19.99 (10% Off)
5

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Bloom City

Bloom City Organic Liquid Seaweed and Kelp Fertilizer Supplement (128 oz) Concentrated Makes 750 Gallons

Bloom City

$39.99

More Details
Main highlights
- SIMPLE AND SAFE TO USE FOR ALL PLANTS: Add to every watering, it’s that easy. No risk of over application, plants love kelp. Clean Kelp aids in every stage of growth for root and stem health.
- FULLY ORGANIC SEAWEED AND KELP: A seven species blend of Ascophyllum Nodosum, Palmaria Palmata, Ecklonia Maxima, Laminaria Saccharina, Chlorella Vulgaris, Arthrospira Platensis, and Chondrus Crispus.
- FORMULATED AND MADE IN THE USA: Designed by botanists and plant chemists. Bloom City chooses only the highest quality ingredient sources and manufacturing methods to create the world’s best craft growing nutrient systems
- FOR BOTH PLANTS AND LAWNS: Add Clean Kelp to all of your houseplants, vegetable garden, and your lawn for healthy green plants.
- EXTRACTED TO PROTECT NATURAL ENZYMES: Clean Kelp’s unique processing techniques give the cleanest possible kelp extract. Get all the benefits of natural kelp enzymes and hormones without the non-nutritious fibrous pulp that gives other kelps their thick, brackish appearance. You can see the difference.
$39.99

Best kelp fertilizers - May 2026

Down To Earth All Natural Fertilizers Organic Kelp Meal - Plant Food with Seaweed (Ascophyllum nodosum), Potassium and Trace Minerals 1-0.1-2, 4 lb

Down To Earth All Natural Fertilizers Organic Kelp Meal - Plant Food with Seaweed (Ascophyllum nodosum), Potassium and Trace Minerals 1-0.1-2, 4 lb

Bloom City Organic Liquid Seaweed and Kelp Fertilizer Supplement, Quart (32 oz) Concentrated Makes 180 Gallons

Bloom City Organic Liquid Seaweed and Kelp Fertilizer Supplement, Quart (32 oz) Concentrated Makes 180 Gallons

Bloom City Organic Liquid Seaweed and Kelp Fertilizer Supplement (128 oz) Concentrated Makes 750 Gallons

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Bloom City Organic Liquid Seaweed and Kelp Fertilizer Supplement (128 oz) Concentrated Makes 750 Gallons

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