Kelp Cannabis

Kelp Cannabis

Table of Contents

Kelp cannabis, also referred to as seaweed powder, stands as a natural fertilizer sourced from dried seaweed, enhancing the robustness, vitality, and resilience of cannabis plants against stressors, pests, and diseases. It presents an appealing alternative for vegan cultivators, eschewing animal-derived products like bone meal or blood meal. Moreover, it embodies a renewable and sustainable option. Overall, it serves as a multifaceted solution for organic cannabis growers, akin to a Swiss army knife.

Kelps weed, belonging to the Laminariales order, are brown seaweeds characterized by rapid growth rates, sometimes up to half a meter per day, with heights ranging from 100 to 160 feet. They predominantly inhabit oceanic and sea environments, particularly near shores and in deep waters with temperatures below 68°F, forming extensive kelp forests, pivotal ecosystems that harbor diverse species, akin to vast underwater trees nurturing myriad organisms.

Devoid of roots, kelps rely on filtering seawater for nutrients, enabling them to continually contribute nutrients to the soil upon decomposition, thus perpetuating their role as a renewable resource and organic fertilizer for cannabis cultivation, benefiting both marine life and growers.

Origin of Seaweed in Agriculture

kelp cannabis

Seaweed isn’t one plant, but a vibrant underwater kingdom! Encompassing over 10,000 distinct species, these marine marvels, technically called “macroalgae,” thrive in ocean depths. Unlike their land-dwelling cousins, seaweed lacks vascular tissues, relying on sunlight, dissolved nutrients, and carbon dioxide directly absorbed from the water. This explains why many species favor a mostly submerged existence.

The sheer variety of seaweed is astonishing. From microscopic specks to the colossal Antarctic kelp, stretching a breathtaking 33 meters, each species boasts unique characteristics, flavors, and nutritional profiles. While this article delves deeper into the fascinating world of kelp, remember, that seaweed’s diversity paints a breathtaking picture of ocean life.

What’s the Difference Between Kelp and Seaweed?

kelp cannabis

While often lumped together, kelp isn’t just any seaweed; it’s a superstar within the vast underwater kingdom. This specific type of brown algae thrives in nutrient-rich, shallow waters, forming lush underwater forests known as kelp forests. This unique environment is what makes kelp a potent nutritional powerhouse for plants like cannabis.

Kelp acts as a natural ocean sponge, readily absorbing a vast array of essential minerals from the seawater. When used as fertilizer, these minerals are released into the soil, directly benefiting plants. The sheer diversity of nutrients packed within kelp is truly impressive, boasting over 60 trace elements vital for plant growth. From iron and manganese to cobalt, zinc, and molybdenum, kelp provides a comprehensive nutritional boost for optimal plant health.

Maximizing Your Cannabis Garden: A Guide to Harnessing the Power of Kelp

Utilizing kelp to nourish your cannabis plants is a straightforward yet versatile approach. Depending on your specific needs and preferences, you can choose from several effective methods:

Pre-Planting Powerhouse

  • Kelp Meal Cannabis: This nutrient-packed option involves mixing 17.6 oz of kelp food per 9m³ of soil four months before planting. This slow-release method creates a fertile haven for your cannabis, fostering beneficial bacteria and establishing optimal pH from the get-go.

Direct Nutrient Delivery

  • Kelp Powder Foliar Spray: For a rapid nutrient boost, mix ½ teaspoon of kelp powder with 5 liters of water and mist directly onto your plant’s leaves. While not a substitute for regular feeding, this foliar spray provides immediate access to vital nutrients.

Multifaceted Mulching

  • Fresh Kelp Mulch: Pile whole, fresh kelp around the base of your plant. As it decomposes, its rich nutrients gradually enrich the soil, suppress weeds, promote healthy bacteria, retain moisture, and maintain proper pH.

Nutrient Synergy

  • Kelp Composting: Add fresh kelp to your compost bin, ensuring good mixing to prevent airflow issues. This enriches the overall compost and provides sustained nourishment for your plants.

Liquid Convenience

  • Kelp-Based Liquid Fertilizer: Similar to using conventional liquid fertilizers, simply add the recommended amount (typically 1 teaspoon per 2.5 liters of water) to your watering routine. Remember, moderation is key to avoid overfeeding.


By choosing the kelp application method that aligns with your goals and preferences, you can unlock its potent nutritional potential for a thriving cannabis garden.

Exploring Kelp Foraging

While purchasing kelp fertilizer, powder, or meal is readily available, living near the coast unlocks the exciting possibility of foraging on your own. However, before embarking on this adventure, tread carefully:

Legality First: Always check local regulations regarding kelp harvesting. In some areas, it might be restricted or require permits. Responsible foraging is crucial for preserving the delicate coastal ecosystem.

Sustainable Harvesting: When the tide recedes, pockets of kelp may appear scattered on the shore. Resist the urge to deplete an area. Instead, selectively harvest detached pieces, leaving holdfasts and healthy stands untouched. Remember, other marine life depends on thriving kelp forests.

Mindful Collection: Avoid kelp washed ashore for extended periods, as its quality might be compromised. Opt for fresh, firm pieces with vibrant coloration. A quick rinse with seawater removes any clinging debris before your journey home.

Ethical Enjoyment: By prioritizing responsible practices and respecting the coastal ecosystem, you can transform kelp foraging into a sustainable and rewarding experience, enriching your garden while safeguarding the marine environment.

The Advantages of Seaweed Extract

Seaweed extract, particularly kelp meal for cannabis, packs a potent punch for cannabis plants, boosting their health and growth in numerous ways. Here’s a closer look at its key benefits:

1. Micronutrient Powerhouse

While not a primary source of macronutrients like NPK, kelp meal shines as a treasure trove of over 60 trace elements (micronutrients) often scarce in soil. Calcium, magnesium, sulfur, manganese, copper, iron, and zinc are just a few examples, playing crucial roles in enzyme function, chlorophyll production, and overall plant resilience.

2. Stress-Busting Vitamins

Seaweed extract is rich in vitamins, especially B vitamins, vital for plant energy metabolism. These vitamins act as natural stress relievers, particularly during vulnerable stages like cloning, where they can significantly reduce plant mortality.

3. Growth Hormone Symphony

Auxins, gibberellins, and cytokinins – powerful plant growth hormones – are abundant in kelp. Cytokinins, in particular, promote cell division and tissue differentiation, leading to increased leaf chlorophyll content and enhanced foliage growth. Applied during flowering, kelp for weed extract can even trigger new sprout formation.

4. Germination and Elongation Boost

Gibberellins, another key hormone in kelp, excel at promoting stem elongation and seed germination. Soaking seeds in seaweed extract before planting can give them a powerful growth head start.

5. Natural Shield against Pathogens

Kelp’s inherent antibiotic properties offer natural protection against harmful viruses and bacteria, safeguarding cannabis plants from infections and pest infestations.

6. Fueling the Microbial Engine

Seaweed extract’s rich carbohydrate content serves as readily available food for beneficial microorganisms in the root zone. These “sponges” help retain moisture near the roots, providing sustained hydration without waterlogging.

7. Soil Superstar

The same carbohydrate molecules also improve soil structure and fertility by feeding beneficial bacteria and fungi. As a bioactivator, kelp extract enhances the substrate’s biological activity, promoting organic matter decomposition and nutrient availability for optimal plant uptake.


In conclusion, kelp cannabis, also known as seaweed powder, emerges as a natural fertilizer derived from dried seaweed, offering a comprehensive solution for enhancing the vitality, resilience, and overall health of cannabis plants. It presents an attractive alternative for vegan growers, avoiding animal-derived products like bone meal or blood meal while embodying a renewable and sustainable option. Kelp cannabis serves as a versatile tool, akin to a Swiss army knife, providing a multitude of benefits for organic cannabis cultivation.

Furthermore, understanding the origin of seaweed in agriculture sheds light on its diverse species and unique characteristics, highlighting the significance of kelp within the underwater kingdom. Its rapid growth rates and nutrient-absorbing capabilities contribute to its role as a renewable resource and organic fertilizer, benefiting both marine life and growers.

Exploring various methods of harnessing the power of kelp in cannabis cultivation reveals its versatility and effectiveness. Whether through pre-planting applications, direct nutrient delivery, mulching, composting, or liquid fertilizers, kelp offers a range of options for growers to optimize plant health and growth.

Additionally, foraging for kelp near coastal areas presents an exciting opportunity for growers, provided it is done responsibly and sustainably, respecting local regulations and the delicate marine ecosystem.


1. Is seaweed good for flowering cannabis?
Seaweed stands out as one of the most nutrient-rich fertilizers suitable for cultivating cannabis, boasting numerous additional benefits. If incorporating kelp into your cannabis cultivation is feasible, it’s highly recommended to do so!

2. Is Kelp good for Autoflowers?
However, when cultivating autoflowering cannabis, it’s crucial to reduce the dosage by up to three-quarters to avoid nutrient burn. Typically, if you’re utilizing liquid seaweed, you would dilute it in water and proceed to water your plant as usual.

3. Which is better for plants, seaweed or kelp?
Both kelp and seaweed serve as excellent fertilizer options for your garden plants. Nevertheless, if prioritizing high levels of trace elements and calcium in your fertilizer is crucial, then the advantages of kelp render it the superior choice.

4. Is kelp a complete fertilizer?
While it contains a decent amount of nitrogen and potash, seaweed fertilizer lacks significant phosphorus, a vital plant nutrient, making it incomplete. The two most beneficial kelps for overall plant growth are Ascophyllum Nodosum and Laminaria Digitata.

5. Does kelp help plants grow?
Incorporating kelp as a soil amendment enhances plants’ strength and vitality by boosting their nutrient absorption capacity.

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