Help your plants resist stress

Help your plants
to resist stress

Support your plants to grow better

Support them
to grow better

With high quality locally harvested seaweed biostimulants

With high quality
locally harvested
seaweed biostimulants

Purest seaweed In the world

Comes from New Zealand

Waikaitu harvests and processes seaweed Undaria Pinnatifida (common name Wakame) from Marlborough Sounds, New Zealand to produce food, pharmaceutical ingredients and soil nutrition products.

Due to our low population density, environmental focus and very little heavy industry we have one of the cleanest environments in the world. And we believe that our seaweed has the lowest contaminants compared to other products.



family of products


Waikaitu NitroBoost contains seaweed extract mixed with protein hydrolysates which are the organic material obtained by the hydrolysis of proteins to their constituent amino acids and short polypeptides. Waikaitu NitroBoost is made from sustainably harvested brown kelp from New Zealand’s clean waters which makes Waikaitu NitroBoost very low in heavy metals.  Waikaitu NitroBoost can be used in conjunction with standard fertilizer programs.

In independently conducted research on Strawberries and Lettuces in California NitroBoost was used to replace up to 50% of Ammonium Nitrate with a much smaller amount of NitroBoost and still maintain plant growth rates, yields and leaf nutrient levels.  This led to over 60% reduction in Nitrate leaching and ammonia volatilization.   

Mode of Action

Waikaitu NitroBoost combines fresh New Zealand made seaweed extract with an organic source of animal and vegetal protein hydrolisates to deliver 5% Nitrogen. Applying NitroBoost with Chemical Fertilizers will chelate and buffer Nitrates reducing damage to soil bacteria. NitroBoost helps to fix Nitrates in the soil and reduce leaching and ammonia volatilization.  This protects the environment without negatively impacting yields.  Additionally, NitroBoost supports the plant immune system to induce resistance to adverse weather conditions.

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Human Nutrition Products

New Zealand Seaweed Nutritional Supplements 

Processing makes all the difference. Freshly picked, never frozen, and processed immediately at low temperatures to maintain nutritional bioactivity.
Our processing is low heat – even lower than freeze drying.

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New Zealand Seaweed Nutritional Supplements
Purest seaweed in the world

Purest seaweed
in the world

Purest seaweed in the world

Comes from
New Zealand

Purest seaweed in the world


What do growers say about our product

“Using Waikaitu has been our best return on investment and our vines and in the best shape they have ever been.”
Mahana Estate
“The growth, colour and lush look of plants is remarkable. We are very impressed with the incredible results.”
Professional Landscape Designers
Green Grass
“Our new grass is of the deepest green ever seen with happy calves and very good results on the pasture.”
Gloria Bird
Organic Calf Raiser

About Waikaitu

It is not enough to be environmentally responsible, you also need to create great products that meet customers needs and provide superior value. For this you need to have a great team of people. We are a group of professionals, dedicated to solving a problem in our waters and to turn an invasive seaweed species into something that is positive for health of plants, humans and animals. We would appreciate if you would join us on our journey to improve our environment on land and in our oceans.

Meet the team

Mission and vision

Mission and Vision

Our values are clear. No compromises when it comes to safety, purity, nutrition and quality of our products. Our mission is to improve plant, human and animal nutrition and health through the use of one of the most complete vegetarian storehouses of nutrients, antioxidants and omega 3 oils – brown seaweed.
Our name exemplifies our values. The Maori words that make up our name mean:  Wai – Water, Kai – Food and Tu – To Anchor ourselves, to take a stand. We are committed to producing pure, clean, delicious food and effective pharmaceutical and soil nutrition ingredients. For more information please see Alex’s interview at AsktheQ.

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Undaria Pinnatifida (Wakame) is an invasive species in New Zealand. It came to our country in the ballast water of cargo ships and has spread throughout the coastal waters. We collect this seaweed only from mussel farms which are man made structures and not from natural surfaces. Undaria colonizes all hard surfaces, displacing native seaweed and altering the ecological balance in marine environment. For mussel farmers Undaria causes many issues by displacing and choking mussels, reducing harvesting productivity and increasing fuel usage and maintenance costs. By supporting our company through your purchase of our products you are helping us to reduce the impact of this seaweed on our environment and a way of life.

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Certification and Independent Testing

At Waikaitu, we believe in third party, independent testing, verification and licensing. Our customers need to know where their product comes from, its composition and quality as well as its organic status. The want to be sure that the products we sell are sustainable, and ecologically responsible. We believe that having rigorous third party testing is the best way to assure our customers of our commitment to quality and sustainability.

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If you are interested in our products or company,
please write to
We are looking for distributors for our products worldwide.

Waikaitu Limited office: 


1895 Lexington Avenue South

Mendota Heights, MN 55118

Telephone: 651-399-9490

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