We are independent & ad-supported. We may earn a commission for purchases made through our links.

Advertiser Disclosure

Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.

How We Make Money

We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently from our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is Kelp Fertilizer?

By Steve R.
Updated May 17, 2024
Our promise to you
WiseGeek is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At WiseGeek, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

A form of seaweed, kelp is produced in the ocean and is totally organic. Loaded in the elements of nitrogen, phosphorous, sulfur, and potassium, kelp is often used as a fertilizer. Kelp fertilizer strengthens soil with these nutrients, allowing plants to become more hearty and healthy. The organic substance boosts heat in plants and increases their capacity to withstand the outdoor elements. The seaweed also aids in lowering a plant's vulnerability to diseases and attacks from infectious insects.

Kelp fertilizer can come in different forms. Kelp meal is used as a soil conditioner. To become a meal, the seaweed is quickly dried at a low heat to sustain proper moisture level for vitamin and amino acid consistency. Kelp powder, another form of kelp fertilizer, is made from a dehydrated liquid extract from seaweed. The powder can be used as a fertilizer when it is mixed with liquid. Kelp can be found at local garden centers, garden stores, and places that sell organic products.

The seaweed product is a valuable asset to plants as a fertilizer. Kelp enhances seed production and promotes thicker maturation of roots. The use of kelp leads to a larger production of chlorophyll, which leads to darker leaves and higher sugar levels in plants. Kelp also helps to increase the amount of mineral intake from the soil that flows into the plant's leaves.

When kelp fertilizer is used, it acts as a ripening agent, allowing plants to grow and develop quickly. After plants ripen, the kelp then acts as an agent to slow the aging process. This allows plants to live longer.

Kelp acts as a source of bioactivators. A bioactivator is an organic material that aids in decomposing other materials. In compost, kelp assists in the process of decomposing other plants into chemical components that plants are able to take advantage of. The decomposition of plant material also augments the quality of the soil. When kelp is added to a compost, it breaks down faster than other items, such as grass clippings and leaves.

For application in gardens, use three pounds (about 1.36 kg) per 100 square feet (about .09 square meters). In lawns, use 10 pounds (about 4.54 kg) per 100 square feet (about .09 square meters). With trees, use one pound (about 453 grams) per inch (about 2.5 cm). In compost, add three to six ounces (about 88.5 ml to 177 ml) per cubic foot. To water plants with kelp meal, add one gallon (about 3.78 liters) and stir.

WiseGeek is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.

Discussion Comments

By ddljohn — On Aug 22, 2013

From what I understand, kelp powder and meal are meant to be mixed into the soil, whereas liquid kelp fertilizer is meant to be sprayed onto the plants, correct?

Which is better? Do the plants absorb the nutrients better from the soil or directly from the leaves?

Should I use the one of these products or both types?

By donasmrs — On Aug 22, 2013

@SarahGen-- Kelp is a type of seaweed, so you can definitely make your own fertilizer with it. I do it as well. I live on the Pacific coast and I can get fresh kelp here. I leave the kelp in water for the vitamins and minerals to dissolve into the water. I use the water as liquid plant and grass fertilizer.

It's a very cheap way to maintain a garden. I highly recommend doing this if you can get fresh kelp.

By SarahGen — On Aug 21, 2013

I've heard that some farmers use fresh seaweed or dried seaweed to make their own seaweed fertilizer at home. Can the same be done with kelp?

WiseGeek, in your inbox

Our latest articles, guides, and more, delivered daily.

WiseGeek, in your inbox

Our latest articles, guides, and more, delivered daily.