10 Best Seaweed Fertilizers For Nutrient Rich Soil

10 Best seaweed fertilizers for nutrient rich soil - January 2026

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Last Updated: 04-01-2026

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envii SeaFeed Xtra – Organic Liquid Seaweed Fertiliser, Outdoor Plant Food Ideal for all Plants, Lawns, Gardens and House Plants, Rich in Additional Nutrients - 5 Litre

envii

9.8

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MARPHYL Organic Liquid Fertilizer - Outdoor & Indoor Plant Food - Nutrient-Rich Garden Fertilizer- All Purpose Soil Enhancer for House Plants, Flowers, Vegetables, Succulents, Bamboo, Hydroponics

MARPHYL

9.6

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Soil Enhancer Garden Granulated Seaweed Fertiliser (800g)

Gardening Naturally

9.5

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The Shropshire Seaweed Company - Certified Organic Plant Food & Lawn Feed - Promotes Growth, Enhances Roots & Soil Health. Sustainably Sourced from Ireland Liquid Organic Seaweed Fertilizer 1L

Shropshire Seaweed

9.2

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envii SeaFeed Xtra – Organic Seaweed Fertiliser, Liquid Outdoor Plant Food Ideal for all Plants, Lawns, Gardens and House Plants, Rich in Additional Nutrients - 1 Litre Makes up to 500L

envii

9.1

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1.75 KG ORGANIC SEAWEED FERTILISER - Calcium and Seaweed Granular Soil Enhancer, Conditioner and Fertiliser for Lawns, Flower Beds and Vegetable Patches

SOW 'N' GROW

8.8

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CaplinTec Seaweed Fertiliser Pellets – Organic Plant Foodd for Gardens, Pots & Beds, Fast-Acting, Easy to Use Lawn Fertilizer, Nutrient-Rich & Sustainable Feed, 500 Grams

CaplinTec

8.6

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Elixir Gardens | Organic Seaweed Meal Fertiliser/Soil Improver | 500g - 25kg Available in a Bag or Tub | 1kg Bag

Elixir Gardens

8.4

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Seaweed and Kelp Fertilizer for Plants - Organic Sea-K - Concentrated Extract Powder Nutrient Makes 700 Liters

Greenleaf Nutrients

8.2

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Florasoul® Organic Vegan Fertilizer for Self-Sufficient Gardeners! All-Purpose, Nutrient-Rich Plant Food for Lush Growth, Vibrant Flowers & Healthy Soil – 100% Natural, Pet-Friendly!

florasoul

8.1

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envii SeaFeed Xtra – Organic Liquid Seaweed Fertiliser, Outdoor Plant Food Ideal for all Plants, Lawns, Gardens and House Plants, Rich in Additional Nutrients - 5 Litre

MARPHYL Organic Liquid Fertilizer - Outdoor & Indoor Plant Food - Nutrient-Rich Garden Fertilizer- All Purpose Soil Enhancer for House Plants, Flowers, Vegetables, Succulents, Bamboo, Hydroponics

Soil Enhancer Garden Granulated Seaweed Fertiliser (800g)

The Shropshire Seaweed Company - Certified Organic Plant Food & Lawn Feed - Promotes Growth, Enhances Roots & Soil Health. Sustainably Sourced from Ireland Liquid Organic Seaweed Fertilizer 1L

envii SeaFeed Xtra – Organic Seaweed Fertiliser, Liquid Outdoor Plant Food Ideal for all Plants, Lawns, Gardens and House Plants, Rich in Additional Nutrients - 1 Litre Makes up to 500L

1.75 KG ORGANIC SEAWEED FERTILISER - Calcium and Seaweed Granular Soil Enhancer, Conditioner and Fertiliser for Lawns, Flower Beds and Vegetable Patches

CaplinTec Seaweed Fertiliser Pellets – Organic Plant Foodd for Gardens, Pots & Beds, Fast-Acting, Easy to Use Lawn Fertilizer, Nutrient-Rich & Sustainable Feed, 500 Grams

Elixir Gardens | Organic Seaweed Meal Fertiliser/Soil Improver | 500g - 25kg Available in a Bag or Tub | 1kg Bag

Seaweed and Kelp Fertilizer for Plants - Organic Sea-K - Concentrated Extract Powder Nutrient Makes 700 Liters

Florasoul® Organic Vegan Fertilizer for Self-Sufficient Gardeners! All-Purpose, Nutrient-Rich Plant Food for Lush Growth, Vibrant Flowers & Healthy Soil – 100% Natural, Pet-Friendly!

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