Seaweed is rich in micronutrients and plant growth hormones, which makes it an incredible fertilizer for both outdoor and indoor plants.[1] One easy way to take advantage of seaweed’s plant-boosting properties is to brew a liquid seaweed fertilizer, or “seaweed tea.” Making your own seaweed tea is super easy, all-natural, and pretty fun, too! Keep reading to learn how to make liquid seaweed fertilizer from either fresh or dried seaweed, plus how to use it to grow a greener, more beautiful garden.

Things You Should Know

  • Use washed-up seaweed collected from the beach or dried, unroasted seaweed to make your fertilizer.
  • Soak the seaweed in a bucket of water for at least 4 weeks.
  • Dilute the seaweed fertilizer with water and use it to water your outdoor and indoor plants.
1

Collect seaweed.

  1. Use fresh seaweed from the beach (or buy dried seaweed instead). This is the fun part! Head to the beach with a bucket or bag and collect seaweed that’s washed up on shore. Just make sure to check your local laws online first—in some places, it’s illegal to collect seaweed on the beach, or there’s a limit to how much you can collect in one day.[2]
    • If you can’t make it to a beach or collecting seaweed isn’t allowed in your area, order dried (but unroasted) seaweed online and use that to make your fertilizer tea instead.[3] It will still have all the same plant-boosting nutrients as fresh seaweed.
    • Only collect seaweed that’s washed up on shore. Pulling up live seaweed can harm the local ecosystem.[4]
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6

Use the seaweed tea to fertilize your garden.

Community Q&A

  • Question
    Can I use any seaweed to make fertilizer?
    Community Answer
    Community Answer
    Yes, you can.
  • Question
    I bought seaweed tea sheets, how do I prepare it for drinking?
    Community Answer
    Community Answer
    The tea described in this article is liquid fertilizer for plants, do not drink it.
  • Question
    Is seaweed liquid fertilizer good for a cacao plant?
    Community Answer
    Community Answer
    Yes. seaweed liquid extract is good for all plants.
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Things You'll Need

  • Seaweed (fresh or dried)
  • Bucket

About This Article

Kyle Hall
Co-authored by:
wikiHow Staff Writer
This article was co-authored by wikiHow staff writer, Kyle Hall. Kyle Hall works on the content team at wikiHow. He helps manage our team of editors and creates content for a variety of wikiHow projects. Kyle continually looks for new ways to improve the content at wikiHow and make it more helpful and enjoyable for readers. He graduated from Eckerd College in 2015, where he majored in Political Science. This article has been viewed 141,885 times.
3 votes - 100%
Co-authors: 10
Updated: February 23, 2023
Views: 141,885
Categories: Fertilizers
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