Top 10 Seaweed Fertilizer for Plants – Garden Fertilizers

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1. Neptune's Harvest

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Neptune's Harvest Fish & Seaweed Fertilizer 2-3-1 Gallon

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Neptune's Harvest #ad - Blooms will be more plentiful, fragrant and longer lasting. Grow a beautiful vegetable garden. Easy to mix and apply by hand, sprayer, or drip line. Flowers and foliage will be stronger and more colorful.
BrandNeptune's Harvest #ad
ManufacturerNeptune's Harvest #ad
Height12 Inches
Length6 Inches
Weight4 Pounds
Width6 Inches
Part NumberFS191
ModelFS191

2. GS Plant Foods

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Lawns & Soil, GS Plant Foods Organic Liquid Kelp Plant Fertilizer 1 Quart | Omri Organic Listed Seaweed & Kelp Fertilizer Solution | Kelp Seaweed Plant & Vegetable Growth Concentrate for Gardens

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GS Plant Foods #ad - This can be applied to any type of soil or plant without concern for waste or harmful chemicals. To lengthen the life of cut flowers, spray a day or two before cutting. Our organic liquid kelp fertilizer will help stimulate natural root growth, mineral uptake and overall plant growth and vigor. Works synergistically with all fertilizers: liquid kelp from gs plant foods is among the highest quality seaweed products you can get.

Optimal plant growth & health at home or commercially: used in low concentrations, as well as at home for gardeners as an organic soil conditioner. Gs plant foods liquid seaweed fertilizer is used extensively on a commercial basis, and yet maintain the same kill effectiveness. It works synergistically with all fertilizers especially with a high quality liquid fish fertilizer such as GS Plant Foods Organic Liquid Fish. In lieu of trying to catch specific growth stages, apply when plants are beginning to bud.

To promote additional buds, spray 10 days before harvesting. Our liquid kelp plant fertilizer greatly increases your plant’s resistance to stressors such as excessive heat, which results in darker green leaves and increased sugar content in plants. To extend the shelf life of fruits and vegetables, apply every 4 to 7 days. One of nature’s ‘miracle’ plant foods: made from the finest seaweed plant ascophyllum nodosum, drought conditions and more. Using this kelp plant food will lead to healthier crop yields and general plant well being.
BrandGS Plant Foods #ad
ManufacturerGS Plant Foods #ad

3. Bloom City

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

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Bloom City #ad - Extracted to protect natural enzymes: clean kelp’s unique processing techniques give the cleanest possible kelp extract. No risk of over application, plants love kelp. Formulated and made in the usa: designed by botanists and plant chemists.

You can see the difference. Fully organic seaweed and kelp: a seven species blend of Ascophyllum Nodosum, Palmaria Palmata, Chlorella Vulgaris, Laminaria Saccharina, Ecklonia Maxima, Arthrospira Platensis, and Chondrus Crispus. Simple and safe to use for all plants: add to every watering, it’s that easy. For both plants and lawns: add Clean Kelp to all of your houseplants, vegetable garden, and your lawn for healthy green plants.

Bloom city chooses only the highest quality ingredient sources and manufacturing methods to create the world’s best craft growing nutrient systems. Clean kelp aids in every stage of growth for root and stem health. Get all the benefits of natural kelp enzymes and hormones without the non-nutritious fibrous pulp that gives other kelps their thick, brackish appearance.
BrandBloom City #ad
ManufacturerBloom City #ad
Part Numberkelp-32

4. Sea magic

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Sea Magic Dry Soluble Seaweed Extract Fertilizer, Makes 66 Gallons

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Sea magic #ad - Works with any current fertilizer program. 1 ounce package 30 grams. Use in your home garden on all flowers, fruit trees and shrubs, tomatoes, vegetables, strawberries, lawn, seedlings and houseplants. Completely Soluble Seaweed Fertilizer. Makes 66 us gallons or 250 Liters.
BrandSea magic #ad
ManufacturerBonadea Gardens #ad
Height0.2 Inches
Length6 Inches
Width4 Inches
Part NumberSM30PK

5. Neptune's Harvest

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16 Ounce, Neptune's Harvest Seaweed Fertilizer 0-0-1

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Neptune's Harvest #ad - Sourced from the North Atlantic Ocean. It is an excellent addition to Neptune’s Harvest Fish Fertilizer, or other fertilizing program. Neptune's harvest seaweed plant food is made from seaweed ascophyllum nodosum.
BrandNeptune's Harvest #ad
ManufacturerNeptune's Harvest #ad
Height8.75 Inches
Length3.5 Inches
Weight1 Pounds
Width3.5 Inches
Part NumberSW 118
ModelSW118

6. Blue Planet Nutrients

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Liquid Seaweed for Plants 32 oz Quart | Concentrated Liquid Kelp Supplement from Blue Planet Nutrients | Hydroponic Aeroponic Soil Coco Coir | for All Plants & Gardens

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Blue Planet Nutrients #ad - Derived from ascophyllum nodosum. This all-natural 100% organic supplement works well in any garden and is a great way to boost overall plant vitality. Our kelp fertilizer will make a drastic positive change for any type of plant by providing necessary nutrients and natural growth hormones for sweeter fruits, larger vegetables/fruits, increased flower production, overall health and disease resilience, faster & larger root growth, and a longer shelf life for fruits & veggies harvested from plants fed with this product!.

Liquid seaweed can help mother plants produce more successful clones, stimulate growth, and even help produce more fragrant flowers & sweeter fruits.

This product allows your plants to more effectively draw nutrients from the soil, an abundance of flowers on flowering plants, leading to bigger and better harvests, and overall healthy happy plants. Designed for use in all hydroponic systems, perlite, aeroponics, all soil-less mediums such as vermiculite, coco-coir, and in soil.
BrandBlue Planet Nutrients #ad
ManufacturerBlue Planet Nutrients #ad
Height7.5 Inches
Length5.25 Inches
Width2.25 Inches
Part NumberPD-6377

7. Neptune's Harvest

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4 lb, Neptune's Harvest Kelp Meal Multi-Purpose Plant Food 1-0-2

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Neptune's Harvest #ad - Neptune's harvest organic kelp meal 1-0-2 is dried and ground Rock Weed Ascophyllum Nod sum, which grows in the cold clean waters along the New England coast, and is known as the best marine plant available for agriculture today.

It is a natural and cost effective enhancement to any soil fertilization and conditioning program. Full of trace minerals, carbohydrates and Amino Acids, helping create a strong root systems and makes a very healthy plant. Organic kelp meal is ascophyllum nodosum, which is widely recognized as one of the finest marine plants available for agriculture today. It should be tilled in the soil before planting or can be top dressed, incorporated into potting soils, seed beds and composting material.
BrandNeptune's Harvest #ad
ManufacturerNeptune's Harvest #ad
Height4 Inches
Length7 Inches
Weight4 Pounds
Width6 Inches
Part NumberKM 604
ModelKM604

8. Raw Supply

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10 Pounds Maxicrop Organic Kelp Meal 1-0-2 Natural Norwegian Kelp Seaweed Fertilizer

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Raw Supply #ad - Kelp meal is also used to enhance the flexibility and sheen of the skin and coat in dogs, cats, and horses. Maxicrop kelp meal fertilizer is a norwegian kelp, 12 vitamins and 21 amino Acids.

Kelp meal is an organic, reduce plant stress from drought, improve soil structure, non-pollutant resource that adds valuable micronutrients, natural growth hormones and vitamins that help increase yields, and increase frost tolerance. It has been harvested, processed with a patented process, one of the richest known sources of at least 60 Minerals or Elements, dried, then blended and ground to a 14 mesh size. Kelp meal can be incorporated into potting soils, seed and transplant beds, as well as composting material and even used in teas or foliar spray.
BrandRaw Supply #ad
ManufacturerMaxicrop #ad
Weight10 Pounds

9. MARPHYL

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Marine Phytoplankton Micro Seaweed Liquid Organic Fertilizer/Soil Enhancer 16.9 oz, Canada, 33.8 oz & 1.05 gal from Vancouver Island

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MARPHYL #ad - Naturally rich in nitrogen, Phosphorus & Potassium. Marine phytoplankton micro seaweed are Micro Algae full of nutrients, vitamins and minerals. 100% natural, eco-friendly, vegan, organic certified for Organic use by OMRI, non GMO. Use on plants, vegetables, trees, flowers, Lawns, Indoor Plants, Garden, Greenhouses, Hydroponics. Give the growth and health your plants deserve. Recommended use: once every week, Ratio 1/20 - One serving of Soil Enhancer for 20 servings of fresh water.
BrandMARPHYL #ad
ManufacturerMARPHYL #ad
Height7.68 Inches
Length2.44 Inches
Weight1.17 Pounds
Width2.44 Inches

10. Blue Planet Nutrients

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Liquid Seaweed for Plants 128 oz Gallon | Concentrated Liquid Kelp Supplement from Blue Planet Nutrients | Boost Growth & Plant Health | for All Plants & Gardens

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Blue Planet Nutrients #ad - Liquid seaweed can help mother plants produce more successful clones, stimulate growth, and even help produce more fragrant flowers & sweeter fruits. This all-natural 100% organic supplement works well in any garden and is a great way to boost overall plant vitality.

Designed for use in all hydroponic systems, all soil-less mediums such as vermiculite, perlite, aeroponics, coco-coir, and in soil. Derived from ascophyllum nodosum. Our kelp fertilizer will make a drastic positive change for any type of plant by providing necessary nutrients and natural growth hormones for sweeter fruits, larger vegetables/fruits, overall health and disease resilience, faster & larger root growth, increased flower production, and a longer shelf life for fruits & veggies harvested from plants fed with this product!.

Our product is eco-friendly, and yields consistent & amazing results in your garden, soil, cost efficient, sustainable, no matter what you're growing or what medium in which your plants are growing hydroponic, easy to use, all soil-less media etc.
BrandBlue Planet Nutrients #ad
ManufacturerBlue Planet Nutrients #ad
Height11.88 Inches
Length7.48 Inches
Width3.87 Inches
Part Number4336442283