10 Best Seaweed Extract Fertilizers

10 Best seaweed extract fertilizers - December 2025

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Last Updated: 29-12-2025

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ALGA-SOL Cold Press Concentrate Seaweed Extract Ascophyllum Seaweed Extract 5Ltr Biostimulant Fertiliser Fertilizer Seaweed Plant Feed Organic Fertiliser Fertilizer

Mifica

9.8

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15% Off

Multi-Mite 2.5L Liquid Seaweed Organic Cold Pressed Concentrate - 100% Natural - Plant Feed Fertiliser Trees Lawn Veg & House Plants Root or Foliar Feed (2.5 LITRES)

Multi-Mite

9.6

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Best value

Growlands Indoor House Plant Food - 300 ml - Indoor Plant Liquid Spray Fertilizer - With Seaweed Extract - Designed For Use on All Plants - Ready to Use Mist Spray

GROWLANDS

9.5

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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

9.2

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Vitax Organic Liquid Seaweed Fertilizer – All-Natural Concentrated Plant Nutrient for Flowers, Vegetables, Shrubs & Trees – Boosts Growth, Resilience & Yields (500ml)

TOP SAVER

9.1

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Maxicrop XNATF61L All Purpose Organic Garden Natural Fertiliser, 1L - All Purpose Organic Fertiliser - with Seaweed Extract - for Strong Growth and Healthy Root Development - Indoor and Garden Use

Maxicrop

8.8

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

Greenleaf Nutrients

8.6

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18% Off

Maxicrop XOLNF61L Organic Lawn Fertiliser, 1L - Natural Organic Fertiliser with Seaweed Extract for Strong Growth and Healthy Root Development

Maxicrop

8.4

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22% Off

Phostrogen Organic All Purpose Liquid Plant Food, 1L - All Purpose Organic Fertiliser - Enriched with Seaweed Extract for Healthy Growth - More Vegetables, Brighter Blooms - Plant Nutrition

Phostrogen

8.2

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33% Off

Maxicrop POPGSYDL Original Seaweed Extract, Organic Plant Growth Stimulant, 500ML, Concentrate, Brown

Maxicrop

8.1

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ALGA-SOL Cold Press Concentrate Seaweed Extract Ascophyllum Seaweed Extract 5Ltr Biostimulant Fertiliser Fertilizer Seaweed Plant Feed Organic Fertiliser Fertilizer

Multi-Mite 2.5L Liquid Seaweed Organic Cold Pressed Concentrate - 100% Natural - Plant Feed Fertiliser Trees Lawn Veg & House Plants Root or Foliar Feed (2.5 LITRES)

Growlands Indoor House Plant Food - 300 ml - Indoor Plant Liquid Spray Fertilizer - With Seaweed Extract - Designed For Use on All Plants - Ready to Use Mist Spray

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

Vitax Organic Liquid Seaweed Fertilizer – All-Natural Concentrated Plant Nutrient for Flowers, Vegetables, Shrubs & Trees – Boosts Growth, Resilience & Yields (500ml)

Maxicrop XNATF61L All Purpose Organic Garden Natural Fertiliser, 1L - All Purpose Organic Fertiliser - with Seaweed Extract - for Strong Growth and Healthy Root Development - Indoor and Garden Use

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

Maxicrop XOLNF61L Organic Lawn Fertiliser, 1L - Natural Organic Fertiliser with Seaweed Extract for Strong Growth and Healthy Root Development

Phostrogen Organic All Purpose Liquid Plant Food, 1L - All Purpose Organic Fertiliser - Enriched with Seaweed Extract for Healthy Growth - More Vegetables, Brighter Blooms - Plant Nutrition

Maxicrop POPGSYDL Original Seaweed Extract, Organic Plant Growth Stimulant, 500ML, Concentrate, Brown

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