10 Best seaweed fertiliser in Canada

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Last Updated - 2024/05/08

Best Choice
01

GS Plant Foods

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Seaweed Fertilizer - Omri Organic Liquid Fertilizer for Seedlings (1 Gallon) - Liquid Kelp & Vegetable Growth Concentrate for Gardens, Lawns & Soil
9.9

Exceptional

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.
Main highlights

TRUSTED & RELIABLE: At GS Plant Foods, we understand that you are placing your trust in us to provide you with the highest quality organic seaweed fertilizer products available. We have 100% confidence in the quality of our products and continuously strive to deliver the best customer experience. Our products are organic, easy to use, cost efficient, sustainable, and yield consistent & amazing results in your garden, no matter what you're growing or what medium in which your plants are growing.
OPTIMAL PLANT GROWTH & HEALTH AT HOME OR COMMERCIALLY: Used in low concentrations, kelp liquid fertilizer acts as an efficacious growth promoter. GS Plant Foods sea kelp fertilizer is used extensively on a commercial basis, as well as at home for gardeners as an organic soil conditioner. Using GS Plant Foods seaweed plant fertilizer will lead to healthier crop yields and general plant well being.
ONE OF NATURE’S ‘MIRACLE’ PLANT FOODS: Made from the finest seaweed plant Ascophyllum Nodosum, this is one of nature’s miracle plant foods. Our seaweed extract greatly increases your plant’s resistance to stressors such as excessive heat, wind, drought conditions and more. The seaweed fertilizer for plants will increase the bloom set and size of flowers and fruit. It increases and stabilizes chlorophyll in plants, which results in darker green leaves and increased sugar content in plants.
OMRI ORGANIC LISTED SEAWEED & KELP FERTILIZER: Liquid Kelp is a natural plant food that provides a range of benefits for plant health and growth. OMRI listed for organic use, GS Plant Foods Liquid Seaweed Fertilizer is a completely natural, seaweed extract fertilizer for plants. Our liquid seaweed will help stimulate natural root growth, mineral uptake and overall plant growth and vigor. This can be applied to any type of soil or plant without concern for waste or harmful chemicals.
EASY TO APPLY FOR NATURAL GREAT RESULTS: Apply liquid kelp to improve specific growth stages. To promote additional buds, apply when plants are beginning to bud. To extend the shelf life of fruits and vegetables, spray 10 days before harvesting. To lengthen the life of cut flowers, spray a day or two before cutting. In lieu of trying to catch specific growth stages, apply every 4 to 7 days. This liquid kelp should be sprayed in the morning or late afternoon when the leaves stoma are open.

CA$109.69
02

Neptune's Harvest

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Neptune's Harvest Fish & Seaweed Blend Fertilizer 2-3-1 9 lb
9.7

Exceptional

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.
Main highlights

Neptune's Harvest Organic Fish/Seaweed Blend Fertilizer gives you the best of both products with a perfect blend of fish hydrolysate and seaweed, ensuring a complete fertilization program
Growers using our fertilizer regularly have reported increased marketable yields and improved shelf life on fruits and vegetables.
Fish and Seaweed are known to build the natural sugar in plants. Flowers and foliage will be stronger and more colorful. Blooms will be more plentiful, fragrant and longer lasting.

CA$98.75
03

Greenleaf Nutrients

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Organic Sea-K for Plants Seaweed and Kelp Fertilizer Supplement Concentrated Extract Powder Nutrient
9.5

Excellent

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.
Main highlights

Sea-K Kelp is extracted from species Ascophyllum nodosum, Sargassum, Laginariausing the most advanced, low temperature enzymatic hydrolysis processes, maintaining a light brown color and highest purity of beneficial bioactive ingredients.
Promotes strong growth, root viability, germination and yields. Rich in polysaccharides, cytokins, auxins, purines, IAA and more! Don’t miss this essential nutrient for your plants!
Kelp seaweed extract has long been known as one of the most effective, natural and potent ways to improve your plants. Improve resistance to stress; promote fruit and flower expansion, coloring and potency, and increase Brix! Rich concentrations of more than 70 vitamins, minerals, and enzymes helps benefit your plants and revitalize your soil media.
High Potassium(K) for vibrancy, with over 18% soluble K! Also high levels of soluble Magnesium (Mg), Calcium (Ca), Iron (Fe), etc.
100% water soluble powder form suitable for any growthing system or media. Including greenhouse & outdoor drip irrigation, hydroponics, coco, peat, soil, rockwool, etc. 200g ultra concentrated bag size makes up to 1600 Liters!

CA$14.44
Best Value
04

Hungry Houseplant

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Grow Houseplant Fertilizer | All Purpose Liquid Seaweed Fertilizer for Healthier Plants | Starters, Propegation, Tropicals, Flowers, Vegetables, Succulents | Makes 100 L
9.3

Excellent

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🧪 Highly Concentrated- Makes up to 100 L of fertilizer.
🌱 Promotes Healthy Vigorous Growth- making plants more resistant to environmental stress & insect attacks.
🌱 Contains 65+ Vitamins and Nutrients your plants need to Thrive!
🌎 Sustainably Sourced Liquid Seaweed Fertilizer
🇨🇦 Proudly Made in Canada

CA$17.80
05

Unknown

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Sea Magic Dry Soluble Seaweed Extract Fertilizer - 30 Gram Package - Makes 66 US Gallons
9.2

Excellent

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.
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Volume: 30 Grams
Use in your home garden on all flowers, vegetables, tomatoes, strawberries, fruit trees, shrubs, lawns, seedlings, and houseplants.
Sea Magic will not burn your plants if you use too much.
One package of 30g/1oz makes 4 litres/1 gallon of liquid concentrate.
Mixing instructions on package.
Made in Canada by a family owned and operated small business.
30 Grams makes 250 litres (66 Gallons) of liquid organic soil enhancer.

CA$13.95
06

Neptune's Harvest

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Neptune's Harvest Fish & Seaweed Blend Fertilizer 2-3-1 18oz
9.0

Excellent

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.
Main highlights

Gives you the best of both products with a perfect blend of fish hydrolysate and seaweed, ensuring a complete fertilization program
Flowers and foliage will be stronger and more colorful
Blooms will be more plentiful, fragrant and longer lasting

CA$38.99
07

Neptune's Harvest

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Neptune's Harvest Fish & Seaweed Blend Fertilizer 2-3-1 36 Oz
8.9

Very Good

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.
Main highlights

Package Weight: 1.048 kilograms
Gives you the best of both products with a perfect blend of fish hydrolysate and seaweed, ensuring a complete fertilization program
Flowers and foliage will be stronger and more colorful
Blooms will be more plentiful, fragrant and longer lasting

CA$55.98
08

Bonadea Gardens

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Pack of 3 - Sea Magic Dry Soluble Seaweed Extract Fertilizer - 90 Grams Total - Makes 198 US Gallons
8.7

Very Good

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.
Main highlights

Volume: 90 Grams Total (3 Packs of 30 Grams)
Use in your home garden on all flowers, vegetables, tomatoes, strawberries, fruit trees, shrubs, lawns, seedlings, and houseplants.
Sea Magic will not burn your plants if you use too much.
Pack of 3!
One package of 30g/1oz makes 4 litres/1 gallon of liquid concentrate.
Mixing instructions on package.
Made in Canada by a family owned and operated small business.
30 Grams makes 250 litres (66 Gallons) of liquid organic soil enhancer.

CA$29.95
09

MARPHYL

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MARPHYL Organic Liquid Fertilizer – Indoor & Outdoor House Plant Fertilizer - All-Purpose Nutrient-Rich Plant Food - Soil Enhancer for Garden, Flowers, Vegetables, Succulents, Bamboo, Hydroponics
8.4

Good

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.
Main highlights

Superior Liquid Plant Food - MARPHYL Marine Phytoplankton is ideal as an outdoor and indoor plant fertilizer. It works great as vegetable fertilizer, houseplant fertilizer, and garden fertilizer. It’s an organic solution for your garden, greenhouse, and hydroponics. Enjoy gorgeous, colorful blooms with this exceptional flower food. Enhance soil quality and watch your trees, shrubs, vines, grass, plants, flowers, and vegetables thrive
Organic & Sustainable - Our Liquid Marine Phytoplankton Soil Enhancer is an organic, all-purpose plant food that is harvested 100% naturally. It's vegan, non-toxic, non-GMO & sustainably made with no preservatives making it safe for vegetable gardening, groundwater, and pets. This indoor plant food replenishes your soil on a regular basis to ensure the continued growth and beauty of your vegetation. Our organic plant fertilizer will meet your every need and provide a safe environment for all.
Naturally Boost Plant Health - Marine Phytoplankton are Microalgae full of nutrients, vitamins, and minerals. It's so much more than your average liquid plant fertilizer. MARPHYL's fertilizer for indoor and outdoor plants, lawns, trees, flowers etc. provides an astounding array of nutritional elements.Our soil fertilizer is packed with vitamins, minerals, essential fatty acids, DHA, EPA, amino acids, chlorophyll, and a vast spectrum of phytochemicals, to make your garden and greenhouses flourish
Miraculous & Beneficial - Found in oceans across the world, marine phytoplankton are microalgae that infuse your plants, trees, grasses, and more with everything they need for health and longevity. Our plant food is high in potassium, nitrogen, and phosphorus as well as calcium and magnesium for lush foliage. Your lawn & garden will be the envy of the neighborhood, and your indoor plants will brighten your home.
Easy to Use Water Soluble Fertilizer - Simply mix a 1:20 ratio of our liquid plant fertilizer with water. Once in the water, stir, and then pour onto the plants. Soil feed is perfect for use in small and large sprayers. Recommended use is every two weeks. You'll see the difference after just one application.

CA$18.90
10

Gaia Green

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Gaia Green Soluble Seaweed Extract 0-0-17 300g
8.3

Good

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.
Main highlights

CA$41.48