Seaweed is rich in trace elements and potassium, which makes it ideal to add to compost in its raw state, to work in as a mulch, or to create a liquid fertiliser. This is really easy to do and your plants will be thankful for it; seaweed fertiliser releases about 60 nutrients plants can benefit from.[1]

Steps

  1. 1
    Gather the seaweed. Make sure it is lawful to do so and do not pillage your local beach! Look for seaweed that isn't too stinky and is still wet.
  2. 2
    Rinse the seaweed to remove some of the excess salt.
  3. 3
    Fill a bucket or barrel to three quarters way with water. Add as much seaweed as will fit and leave to soak.
  4. 4
    Stir the seaweed mix every two to four days.
  5. 5
    Allow to soak for several weeks to several months. The fertiliser grows stronger over time. Make sure to keep the brew somewhere that its odours won't affect your daily household. It is ready for use when it no longer carries a smell of ammonium.[2]
  6. 6
    Use as needed. When it is ready, use as a fertiliser on your plants and garden beds (soil). It should be diluted with water at a minimum of three parts to one.[3]

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.
  • Question
    Can seaweed be made into liquid form and fed to hens. If so, how long would it keep?
    Community Answer
    Community Answer
    Yes. Seaweed can be liquefied. How long it keeps is dependent upon what, if any, preservation methods you use.
  • Question
    Can seaweed in any for be used in large-scale farms?
    Community Answer
    Community Answer
    Yes. However, if your farm area is larger, logistics can be a big challenge.
  • Question
    Is it 3 parts water to 1 part tea or the other way round?
    Community Answer
    Community Answer
    It's 3 parts water to 1 part fertilizer tea.
  • Question
    How can I find out if a beach in my area allows seaweed to be collected for home use as a fertilizer?
    Community Answer
    Community Answer
    Contact your state Department of Fish & Wildlife. In many coastal states you can obtain a harvest permit for a minimal fee. Some states often include this permit with a saltwater fishing license. There is, of course, a daily or seasonal limit, and care should be taken to not over-harvest this resource.
  • Question
    Can I use seaweed in its natural form for growing potatoes?
    Community Answer
    Community Answer
    Yes; spread it on the soil 10 cm to 15 cm thick in the autumn or early winter, then plant your seed potatoes in the following spring.

Things You'll Need

  • Bucket or barrel
  • Seaweed
  • Water

References

  1. Tim Marshall, Composting, p. 71, (2008), ISBN 978-0-7333-2416-1
  2. Tim Marshall, Composting, p. 71, (2008), ISBN 978-0-7333-2416-1
  3. Tim Marshall, Composting, p. 71, (2008), ISBN 978-0-7333-2416-1
  4. Tim Marshall, Composting, p. 71, (2008), ISBN 978-0-7333-2416-1
  5. Tim Marshall, Composting, p. 71, (2008), ISBN 978-0-7333-2416-1
  6. Tim Marshall, Composting, p. 71, (2008), ISBN 978-0-7333-2416-1
  7. Daryl Crimp and Norman Holtzhausen, Food from the sea, p. 67 and p. 74, (2007), ISBN 978-1-86950-659-9

About This Article

wikiHow is a “wiki,” similar to Wikipedia, which means that many of our articles are co-written by multiple authors. To create this article, 9 people, some anonymous, worked to edit and improve it over time. This article has been viewed 127,881 times.
156 votes - 96%
Co-authors: 9
Updated: November 5, 2020
Views: 127,881
Categories: Fertilizers