03 Jun A Little Kelp From My Friends: How to Make Liquid Seaweed Fertilizer
Yesterday, we started our very first batch of liquid seaweed fertilizer.
As relative newcomers to gardening, we can be delinquent about (because we’re intimidated by) fertilizing. Maybe that’s why we’re so attached to our carnivores — because they infamously self-fertilize?
But we’re coming around. We recently discovered our garden pond as a way to feed our tillandsia; since then, we’ve been intrigued by fertilizing hacks that are both outside the box and right under our noses.
Coastal gardeners from here to the Falkland Islands have been making DIY seaweed liquid fertilizer for ages. Using just water and beach-foraged seaweeds (like bullwhip kelp, sea lettuce and nori), you can brew a tea fertilizer that will fortify and stimulate your plants, via seaweed’s abundance of amino acids and trace minerals. It can also be used in compost and in mulch. According to Eartheasy, seaweed’s sodium content makes it a champion slug repellent.
When we arrived at Windansea yesterday, the tide was ebbing. Kelp beds stretched south toward the rocks. At the height of summer, we diligently avoid these tangled masses of sugar wrack and giant kelp that attract mobs of flies — not a good look while you’re trying to eat a sandwich, play paddleball and drink a smuggled-in cocktail. Today, though? We couldn’t have been happier to see them.
We (1) scooped up seaweed by the handful, targeting clumps that were washed up in shallow tide pools and still wet.
Note: you should check with your local beach/parks department re if it’s actually legal to remove seaweed for personal use. Also, take only modest amounts; don’t go nuts. The daily limit in California for personal use is 10 pounds wet weight, as long as you stay out of aquatic parks and refuges. Cutting away eel grass, surf grass and sea palm is prohibited.
Once our Rubbermaid was full, we packed up our beach wagon and headed home to start our bitchin’ brew.
After (2) rinsing off the seaweed, we (3) refilled its container with water and covered it. Over the next few weeks we will (4) stir the seaweed/water mix every few days, before it’s time to (5) skim off our liquid seaweed fertilizer as needed.
This tea can be applied to the soil or sprayed onto foliage as a foliar feed.
Stay tuned for updates on how this liquid seaweed fertilizer plays with our plants!
Hat tip to Carla Bassi at Green Fresh Florals for turning us on to this idea, and to Rawganique for additional guidance.