Dried, fresh or milled? Seaweed on top of your patch feeds nutrients to your plants & has the potential to ease slug pressure as they don’t like crawling all over the seaweed because it's so salty! 

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It's best to mulch on thick around your plants, spread it around, do not apply compost on top of it. This will slowly break down and give lots of carbohydrates and minerals throughout the season to your plants.