

Regeneration at Every Step
At AquaCulture, we’re dedicated to helping plants flourish while protecting our oceans and soils for a regenerative future. Every product we create celebrates the synergy between the sea and the earth, using only natural, sustainable ingredients. From carefully collecting cast seaweed to crafting plastic-free, carbon-negative fertilisers, we ensure our products nourish plants without harming delicate ecosystems. Our aim is to set a new standard for truly sustainable and circular plant care, what we call The Plant Power of the Sea
Our Vision and Core Values
Circular by Nature
Our fertiliser starts with cast seaweed, collected responsibly to avoid disturbing marine life. What would otherwise be discarded becomes a valuable resource, closing the loop between ocean and earth. Nothing is wasted, and everything is given a purpose.
Plastic-Free and Proud
We’re committed to reducing plastic pollution, from our coastline to our packaging. Every product we make is housed in recyclable or reusable materials, no single-use plastics, ever. Because caring for plants should never come at the cost of the environment.
Carbon Negative Operations
We don’t just offset our emissions, we lock them away. Our process absorbs more carbon than it produces, helping you grow your garden while contributing to a healthier climate. It’s our way of proving that natural fertiliser can be good for plants and the planet.
Respect for the Ocean
The ocean gives us everything we need to create our products, and we take that responsibility seriously. Our seaweed is gathered with care, ensuring local habitats and wildlife remain undisturbed. We work alongside coastal communities to protect the places we love.
Community and Education
Knowledge is as powerful as good soil. We’re passionate about sharing what we’ve learned, whether it’s through local workshops, collaborative research, or supporting regenerative growers. When you choose AquaCulture, you’re part of a movement that’s changing how we think about plant care.
Quality and Natural
We believe the best results come straight from nature. That’s why we never add chemicals (like most), over-process, or mask what makes seaweed extraordinary. From harvesting to bottling, we preserve the raw minerals, micronutrients, and vitality that deliver visible results you can trust, using traditional methods.

Growing a Better Tomorrow
At AquaCulture, our vision is to lead the way in regenerative, ocean-powered plant care. We see a future where every garden, farm, and growing space can thrive without relying on synthetic chemicals or single-use plastics.
We’re working towards:
- Being the go to choice for keeping your houseplants, gardens and crops happy and in tune with nature.
- Expanding access to natural, circular fertilisers that restore soils and lock away carbon
- Supporting coastal communities through responsible seaweed harvesting and local partnerships
- Proving that sustainable practices don’t just protect the planet, they deliver stronger, healthier plants
- Creating more educational resources to inspire a new generation of growers who value transparency, nature, and innovation
By bridging the gap between the ocean and the earth, we aim to set a new standard for what sustainable growing can be. Together, we can build a future where we look to the planet for the answers
Journal
The Best Organic Fertiliser for UK Houseplants and Gardens: Why Seaweed Is the Secret Ingredient
Introduction Across the UK, more gardeners and houseplant lovers are swapping out chemical fertilisers for natural, organic options. The reason is simple: synthetic feeds may give plants a quick boost, but they harm the soil, damage ecosystems, and don’t support long-term growth. There’s one natural ingredient that has quietly supported British growers for centuries - seaweed. Rich in nutrients, gentle on the soil, and completely sustainable, seaweed fertiliser is now being rediscovered as the go-to choice for both gardens and houseplants. At AquaCulture, we make our fertiliser from 100% waste seaweed collected on Cornish shores. No harvesting, no damage to marine life — just a circular, sustainable way to turn what the tide leaves behind into nourishment for your plants. 👉 Shop our Cornish Seaweed Fertiliser today Why Choose Organic Fertiliser in the UK? The UK gardening community is rapidly moving towards greener, more sustainable choices. Organic fertilisers are safer for children and pets, improve soil health, and are far better for the environment than chemical alternatives. By choosing organic fertilisers, you’re not just feeding your plants - you’re enriching the living ecosystem beneath your feet. Healthy soil leads to stronger, more resilient plants, whether you’re nurturing a kitchen windowsill herb garden or a full vegetable patch. What Makes Seaweed Fertiliser Special? Seaweed is more than just a coastal curiosity. For centuries, it’s been used by farmers along the British coastline to improve crop health and yield. Here’s why: Packed with nutrients: Seaweed naturally contains potassium, magnesium, nitrogen, and trace elements that support growth. Boosts resilience: It helps plants withstand drought, frost, pests, and disease by strengthening root systems. Promotes vitality: Natural plant hormones like cytokinins and auxins encourage strong root and shoot development. Eco-friendly: Unlike mined or manufactured fertilisers, seaweed requires no extraction - we only use what washes ashore, classed as ‘waste’. Seaweed vs Other Organic Fertilisers Here’s how seaweed stacks up against other natural options Fertiliser Pros Cons Manure Improves soil, adds organic matter Smell, inconsistent nutrients Compost Sustainable, homemade option Slow to release nutrients Fish emulsion High nitrogen boost Strong smell, limited supply Seaweed Balanced nutrients, odourless, sustainable Needs proper processing 👉 The result? Seaweed fertiliser is one of the cleanest, most balanced, and most sustainable organic feeds available in the UK today. How to Use Seaweed Fertiliser (Houseplants & Gardens) One of the best things about seaweed fertiliser is its versatility. For houseplants: Dilute 10ml per litre of water and use every 2–3 weeks to feed roots. A light foliar spray will also keep leaves glossy and healthy. For gardens: Apply as a watering solution every 2–3 weeks during the growing season. Suitable for vegetables, flowers, fruit trees, and lawns. For larger scale growers: Seaweed is highly effective as a foliar spray across fields and allotments, improving resilience and yield. 👉 See our full usage guide here Sustainability & UK Provenance At AquaCulture, we’re committed to making fertiliser that doesn’t cost the earth. Every batch is created from seaweed cast ashore by the tide, preventing it from going to landfill. During every collection, we also remove plastics and litter washed up with the seaweed - helping to clean our coastlines. Made in Cornwall and shipped across the UK, our fertiliser represents a circular approach: what washes in with the tide goes back to the land to nourish soil and plants. Where to Buy Seaweed Fertiliser in the UK You don’t need to live by the coast to benefit from the power of seaweed. AquaCulture’s products are available online, delivered straight to your door. Choose from: Organic Liquid Fertiliser – for everyday feeding Shock Shot – a concentrated boost for stressed or tired plants Soil Topper – a dried seaweed soil enricher 👉 Shop the full AquaCulture range now Conclusion Seaweed isn’t just another fertiliser - it’s the UK’s most sustainable, balanced, and time-tested natural plant food. From houseplants on your windowsill to crops in your garden, it delivers nutrients, resilience, and vitality without harming the environment. When you choose seaweed, you’re choosing healthier plants and healthier soil - all while supporting a circular, sustainable way of gardening.
Learn moreAquaCulture at Boardmasters 2025: Speaking on the Rising Tide Stage 🌊
AquaCulture was invited to speak on the Rising Tide Stage at Boardmasters 2025. Dan Lee Searle joined a panel of sustainable brands to share the challenges, wins, and vision behind building a truly circular business.
Learn moreSeaweed Fertiliser Trials at Tresemple Farm 🌱🌊
Tresemple Farm in Cornwall has partnered with AquaCulture to trial our organic seaweed fertiliser on their grazing fields. Traditionally, regenerative farms avoid sprayers, but in this case the 100% natural, soil-enriching power of seaweed is the exception. By comparing a treated field with an untreated one, the farm is already seeing over 30% more grass growth, richer colour and improved density - helping to provide a more nutrient-dense diet for their organic beef herd.
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