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Six Tips for Using Seaweed in the Garden

By Gardenista
9/18/2013 12:36:15 PM

Heading to the beach? While you're there, collect some seaweed to use in your garden. For generations farmers in coastal communities like the Channel Islands have been amending their gardens and fields with it. Rich in nutrients and trace elements like potassium, magnesium, nitrogen, and phosphorous, seaweed can help amend garden soil, and the benefits don't stop there.

When fresh seaweed is applied to garden beds as mulch, the application can help mitigate weeds, and won't introduce new weeds or pests the way some bark mulch can. As the seaweed breaks down, it contributes to a lightweight loamy soil. Seaweed can even be brewed into a nutrient-rich tea. Here are six tips for collecting and using seaweed:

Photograph by H Matthew Howarth.

How to Use Seaweed in your Garden:

1. Collect seaweed mid-beach: Says EarthEasy's Greg Seaman, collecting seaweed from the middle of the beach is your best bet. Seaweed that's mid-beach is far enough from the water to have had an opportunity to dry out somewhat, but it's not so dry that land-lubbing bugs have had the chance to get to it.

2. Don't over-harvest: Seaweed has a crucial role in the ecosystem of beaches, so it's important not to strip beaches of it entirely. Greg suggests picking no more than a third of the seaweed from any one patch.

3. Use fresh seaweed: According to the Royal Horticulture Society, incorporating fresh seaweed into the garden can be a good substitute for farmyard manure. There's no need to allow seaweed to dry before adding it directly to garden beds.

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