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rinsing seaweed for mulch and/or compost?

Posted by elisa_Z5 none (My Page) on
Sat, Jun 2, 12 at 22:02

Is it important to rinse the sea (salt) water off of seaweed that you gather to use as garden mulch or to put into a compost pile? I normally gather some in the summer, and have always rinsed it, but didn't know if this is necessary or not.

maybe just leave it out in the rain before adding it to garden or compost bin?


Follow-Up Postings:

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RE: rinsing seaweed for mulch and/or compost?

I would imagine rinsing it would be a good idea, salt is no good for the plants.


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RE: rinsing seaweed for mulch and/or compost?

No, rinsing it is not worthwhile. It's a waste of your time, and more importantly, it's a waste of water.

The amount of salt on seaweed is negligible for soil systems and compost systems. If you're adding so much seaweed that salt becomes a problem, then your soil system or compost system isn't going to be well balanced enough anyways to be successful.

Salt is no good for plants but with enough organic matter in a system other than seaweed you will be fine. What I do is usually add seaweed but in small layers at a time, separated with other organic material like leaves/grass/etc. Space it out and don't go overboard. You'll be fine. Don't waste precious water and don't waste your time.


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RE: rinsing seaweed for mulch and/or compost?

Thanks for the info!
I was also worried that the chlorine in tap water would wreck some of the good stuff in the sea weed, anyway. Good to know rinsing isn't necessary as long as I don't use too much of it.


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RE: rinsing seaweed for mulch and/or compost?

Rinsing seaweed is a waste, even if you have plenty of water.

I can't imagine chlorine causing a problem, People have been watering gardens with chlorinated water (and drinking it) for a long time with no apparent problems.


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RE: rinsing seaweed for mulch and/or compost?

If you have good soil biology & organic matter going in your soil, all of this will counter any effects of chlorine or salt


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