a gardener with a bottle of seaweed fertilizer

Seaweed is a highly nutritious and natural fertilizer for your cannabis plant. It is packed with beneficial nutrients and vital minerals that ensure maximum health, vitality, growth, and high yields. Seaweed extracts are especially beneficial for your cannabis plants, as they protect them from defects that can ruin their health. So you get bigger, stronger, and well-developed plants. For instance, Kelp, an algae seaweed, possesses more than 60 trace elements that boost the health of your cannabis plants and improves their tolerance to pests, diseases, and stress!

Advantages of using seaweed extract for cannabis growth

Many types of seaweed have been used in agricultural systems worldwide for centuries. Fresh seaweed contains large and small plant nutrients and minerals absorbed from the ocean. These include minerals such as sulfur, magnesium, boron, and calcium.

When incorporated into the ground and diet, seaweed may contain beneficial vitamins such as A, C, B12, K, and E. The weed also contains substances that control plant growth, which contributes to your weed plant's rapid and explosive growth.

Use seaweed for cannabis growth to help retain soil moisture and reduce the amount of water your plants need. In addition, when used for mulching, liquid seaweed can reduce or eliminate the need to clear your garden and act as a barrier to forming invasive plants.

The weed also produces compounds that act against certain fungi, viruses, and bacteria. Thus, they act like a "medicine" for the cannabis plant. In addition to fighting the bad bacteria, the seaweed helps to stabilize the soil and promote the growth of beneficial bacteria.

For a youtube video about how to use cannabis superfood, click here.

Kelp: a nutritional power

Kelp is a type of algae seaweed that is exceptionally nutritious. There are about 23 different varieties of Kelp grown around the world. They form underwater kelp forests and grow in shallow, nutritious water. This environment makes Kelp so effective for cannabis and other plants. The weed absorbs many marine minerals that dissolve in the soil when added as compost.

Kelp is capable of meeting most of the nutritional needs of the cannabis plant. It contains more than 60 trace elements necessary for the herb's growth. These include iron, manganese, cobalt, zinc, and molybdenum. Many of these minerals are essential micronutrients for cannabis. Although only needed in small quantities, they enhance important physiological processes.

Kelp provides more than just nutrients. Seaweeds also help to stimulate beneficial microorganisms in the soil. They form synergistic relationships with plants. In exchange for sugar emissions, they break down organic matter and help their plant counterparts access vital nutrients.

Kelp helps control the pH of the soil, which is essential during cannabis cultivation. Cannabis needs a soil pH between 6 and 7 to grow properly. The roots will not absorb nutrients effectively if the pH fluctuates above or below this pleasant spot. Kelp's broad beneficial molecules help cannabis plants during the germination process and allow them to form sturdy and strong stems and branches.

Different forms of kelp

Liquid seaweed extract

There're many Kelp forms. Growers can add liquid seaweed extract to their cannabis. Pour around two teaspoons of seaweed extract into five liters of water. Liquid Kelp also boosts the presence of growth hormones that promote the growth of healthy roots.

Kelp food

Kelp food is the second form of supplement. Add 0.5 kg / 9 m2 to the soil. It takes four months for nutrients to be released into the soil, so add this well before the outdoor growing season begins.

Kelp powder

Finally, kelp powder can be used as a foliar spray because the nutrients are available for direct absorption. Add half a teaspoon of powder in 5 liters of water and spray!

Seaweed for your garden

If you live next to the sea, the easiest way to get the weed is to find it yourself. It's free and is a perfect opportunity to immerse yourself in nature for a while.

Before you do so, research the area you plan to explore. It's good to check if any restrictions prohibit the taking of seaweed from the local environment.

If the weeds are in an open place, go to the beach with a bag and collect a pound or so. Use a guide to identify what you are taking.


Mulching your cannabis plants with seaweed is straightforward. All you need to do is lay the seaweed directly and evenly on your soil and let nature take its course.

Note that seaweed is highly beneficial when mulching your crops. It enhances your plants' moisture retention and improves the health and nutrition of your soil while keeping off fungus and pests.


Considering all the nutritional benefits, it is clear that seaweed will make a great addition to your 'ordinary' compost pile. However, do not forget to distribute the seaweed evenly and allow adequate airflow.

Liquid fertilizer

Liquid fertilizer is elementary to make and very easy to use. It may also be highly concentrated, so be careful you don't use too much of it. Since seaweed breaks down easily, all you need to do is collect your seaweed and any other compost pile into a barrel with some water and allow it to rest for a few months until it breaks down and becomes a liquid.

Remember, liquid seaweed extract will help grow cannabis plants. You can use it on the soil before planting your crops or as a fertilizer spray to protect your plants against diseases and cannabis invaders after germination.

Bottom line

You don't have to live deep in the mainland for your marijuana to thrive. With seaweed being a cannabis superfood, you can always get your expected yield at the end of the season. Once you realize the benefits of seaweed, you will no longer need to worry about the harvest.

Frequently Asked Questions

  • Mix kelp meal fertilizer with soil before planting. For established plants, you can side-dress or top-dress them
  • Before you introduce seedlings in hydroponics, add kelp meal fertilizer to the water bed according to the instructions
  • Spray this fertilizer as foliar for indoor and outdoor cannabis
Seaweed extract is a highly nutritious and natural fertilizer that contains beneficial nutrients and vital minerals for cannabis plants. It ensures maximum health, vitality, growth, and high yields. Seaweed extracts, especially from algae seaweed like Kelp, contain over 60 trace elements that boost the plants' health, improve their tolerance to pests, diseases, and stress, and promote the growth of beneficial bacteria.
Seaweed offers several advantages for cannabis growth. It contains a wide range of nutrients and minerals absorbed from the ocean, including sulfur, magnesium, boron, and calcium. It also contains beneficial vitamins such as A, C, B12, K, and E. Seaweed helps retain soil moisture, reduces water requirements, acts as a natural mulch, and acts as a barrier to invasive plants. It produces compounds that combat fungi, viruses, and bacteria, stabilizes the soil, and promotes the growth of beneficial bacteria.