Plants have to deal with a lot of environmental stress.
This includes heat, cold, wind, drought and disease.
That’s where liquid seaweed fertilizer comes in.
Seaweed for plants has been used by gardeners and farmers for thousands of years.
People have collected it off the beach and put it right on their gardens as a seaweed fertilizer diy and mulch that quickly broke down, releasing dozens of minerals and vitamins and other beneficial components.
When I lived near the ocean on the west coast, I would drive to a nearby beach to do the same.
But nowadays I use liquid seaweed fertilizers instead, made from one of the most common seaweeds: kelp.
Kelp is a wonderful soil amendment, but when we don’t have it around, a seaweed liquid fertilizer still brings many of the same benefits.
And a big advantage of these liquids over the solids is that we can spray them onto plant leaves for direct leaf uptake.
When you do that, the plants get a nice shot of dozens and dozens of different minerals and vitamins.
But the main benefit of liquid seaweed is the natural plant growth regulators and hormones it contains that help plants grow faster, healthier and stronger.
And one of the main things they do is help plants deal with those environmental stressors.
Benefits Of Liquid Seaweed Fertilizer
Probably the most important of seaweed fertilizer benefits is that it’s the best when it comes to boosting plant health and helping plants deal with environmental stressors such as heat, cold, wind, drought and disease.
Like all of my organic fertilizers, it can have a big impact on boosting plant growth, but I often think of it as really excelling at promoting healthier plants.
Using seaweed as fertilizer also increases overall nutrition, including protein content (the protein content of our crops has dropped considerably since WWII).
Seaweed feed has been well studied and has become a mainstay of organic farming and gardening. T. L. Senn did a lot of research on using seaweed as a fertilizer back in the day. He eventually wrote a great little book called ‘Seaweed and Plant Growth.’
His research showed not only the kelp fertilizer benefits for plant health and growth, but also that a quality liquid seaweed can help control insect pests such as spider mites.
Who Needs This The Most?
The reason I recommend this to everyone is that it really is helpful in most gardens.
It doesn’t necessarily give the big boost in plant growth that some products give, but it does boost plant health, which helps discourage pests.
It’s just a nice piece of preventative health care to bring into the mix, and at times can be a quick cure for various ailments a plant may encounter.
That’s why organic farming consultants often recommend it be included in any spray application regardless of what else is being used.
Seaweed Fertilizer Make Your Own
How to make seaweed fertilizer: if you live near a beach with some seaweed on it, you can just take that and use it directly as a seaweed garden mulch, provided it’s legal in your area to remove it.
Be sure to leave some for the beach, though, as it has a big role to play there as food and habitat for many different species.
Or if you want to make a basic liquid seaweed fertilizer, pack the seaweed into an airtight container and fill it with water.
You don’t have to rinse off the salt first.
Let it sit for at least a couple of weeks (or more like a couple of months in cold weather).
It smells quite bad because it’s an anaerobic fermentation, but that’s okay. Adding a bit of EM into the water can cut down on that.
When you’re ready, mix it with 10 parts water and spray it directly onto your plants. It’s not as concentrated as a professionally manufactured kelp fertiliser but will still have many benefits.
If you let it sit long enough, the seaweed will probably decompose and dissolve, but if there’s any left, you can still throw it onto your garden as a mulch.
Finding A Quality Liquid Kelp Fertilizer
There are several species of seaweed that are commonly used for fertilizer.
There are debates as to which one is best, but the similarities are far more important than the differences, so when you’re looking for a seaweed garden fertilizer, my view is to not worry too much about the species.
What’s more important is that the kelp plant food is processed without heat and high pressure, so as to keep as many of the beneficial components intact.
Even some of the organic products – like the popular Maxicrop liquid seaweed – are processed in such a way that they don’t retain nearly as many of the natural growth regulators and beneficial microbes. That’s not to say products like that wouldn’t have any benefit, but they’re definitely not the same quality.
The other thing to think about is whether the manufacturer is sustainably harvesting the seaweed, because overharvesting is becoming an issue. That can be more difficult to figure out.
What I do is contact the manufacturer to ask what they’re doing to make sure their process is sustainable. If they have a good answer instead of brushing me off, that’s a good start. Then I go to the internet to see if anyone else has any more info on the company.
I would like more solid info that that, but seaweed harvesting is not an issue under public scrutiny at this point, even by environmental organizations, so I mostly have to go by word of mouth.
The liquid seaweed fertilizer I use is from Neptune’s Harvest, cold processed and organic. I did some digging and found that it’s made by Thorvin, one of the best seaweed manufacturers in the world when it comes to quality and sustainability.
In terms of quality, they dry the seaweed at low temperatures using geothermal energy in order to retain the nutrients and preserve bioavailability.
In terms of sustainability, they harvest in a geographically remote location, in very clean water, away from agricultural run-off and commercial shipping. They also rotate harvests to allow for sufficient regenerative growth.
How To Use Seaweed Fertilizer
Use 1 quart per 1000 square feet annually.
For example, I use 1/2 cup of liquid seaweed fertilizer per 1000 square feet every month for 8 months of the year.
Mix it with at least 50 times as much water, which is 1/3 cup (5 Tbsp) per gallon of water (or 1.5 gallons of water for each 1/2 cup of fertilizer).
Liquid seaweed is great mixed with liquid fish, EM, compost tea and mycorrhizal fungi.
You can soak/spray root balls to improve germination and early root growth, and decrease transplant shock. Do that at the same ratio above.
You can also soak seeds overnight before planting at the same ratio. You can mix in an equal amount of sea minerals fertilizer or liquid fish fertilizer. So that would be 1 teaspoon of seaweed (and perhaps 1 teaspoon of sea minerals or fish) per cup of water.
You Can Get It Here
In summary, this liquid seaweed fertilizer:
- Provides many benefits, but is especially known for improving plant health and helping plants deal with heat, cold, wind, drought and disease.
- Is manufactured sustainably, without heat and pressure, therefore providing much more benefit than other brands.
- Is organic (OMRI-Listed) and undoubtedly one of the most popular organic fertilizers available.
As a free bonus when you order today, I’ll also enroll you in my online Biostimulants course.
Just choose your container size and click ‘Add To Cart’ up above!
- I ship in the U.S. only. I ship 7 days a week.
- In the continental U.S., shipping is $10 (if your order is $99 or less) or free (if your order is $100 or more).
- All of my products have a 1 year 100% money-back guarantee.
- If you have a question about a product, leave it in the comment section below I'll try to respond within a few hours.
- Dry fertilizers and compost tea brewers ship separately so they will arrive on their own maybe a day or 2 apart from my other products.
- With every order, I send $1 to Organics 4 Orphans and other similar organizations. O4O is working with the world’s poor to help them grow organic, highly nutritious, highly medicinal food for themselves, and then use the surplus food to generate income for themselves as well as feeding the orphans in their communities. My hope this year is to again send $1500US, which is enough to start projects in 25 new communities!
Free $25 Bonus When You Buy Today
When you buy this liquid seaweed fertilizer, you get enrolled in my online Biostimulants course.
The course includes 10 videos totaling about 75 minutes where I chat about seaweed, fish, sea minerals, molasses, rock dust, and how to use them all.