Organic Liquid Seaweed Fertilizer
Organic Liquid Seaweed Fertilizer
Our organic cold-pressed liquid seaweed fertilizer is made to support healthier soil and stronger plant growth in the long term. Thoughtfully crafted for lawns, flowers, fruit, vegetables and ornamentals, our plant food helps gardens thrive, not just survive.
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Why Cold Pressed?
Why Cold Pressed?
Organic seaweed has been used by growers for generations because of what it brings to soil and plants, not just nutrients but long-term biological support. Unlike heavily processed extracts, our cold-pressed seaweed preserves the full range of delicate natural compounds that plants and soil life respond to.
We gently press the seaweed mechanically, without high heat or strong chemicals, to conserve micronutrients, plant hormones and bioactive compounds. This process means plants interact with seaweed in its most complete, natural form. What does this mean for you? The product goes a lot further and makes a bigger impact for much longer. Many products labelled “seaweed feed” are chemically extracted or heated, which can degrade the very compounds that give seaweed its value.
Certified organic and made solely from sustainably harvested seaweed with no artificial additives or preservatives, this plant food reflects our commitment to garden wellbeing and environmental care.
Key Benefits
Key Benefits
Supports soil life – encouraging microbial activity for richer, living soil
Strengthens roots – for better structure and nutrient uptake
Improves resilience – plants bounce back more easily from stress
Enhances growth – strong stems, vibrant leaves and abundant harvests
Broad uses – suitable for lawns, beds, containers and more
How to use
How to use
- Shake: Give the bottle a gentle shake before use.
- Measure: Fill the cap with 10ml of Organic Seaweed Fertiliser.
- Dose: Add your measure to a full 5 litre (1 gallon) watering can.
- Feed: Water plants and soil thoroughly, allowing it to soak in naturally.
When to Use
When to Use
When to Use
Our organic liquid seaweed fertiliser is gentle enough to use year-round, supporting plants through steady growth, recovery and seasonal change.
Spring: During spring, many fruits, vegetables and flowers enter their periods of active growth, needing more support to develop leaves, roots and shoots.
Summer: Feeding your plants with our seaweed fertilizer through the summer promotes a healthier harvest, ensuring plants are sufficiently fuelled to produce flowers and fruits.
Autumn: As growth starts to slow, applications can be reduced from weekly to monthly.
Winter: During the winter, a seaweed feed helps to enrich your soil for the following season.
For more detailed instructions, learn how to get the most from your bottle below where you’ll find out how to use our product for a wide range of uses.
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Get the best from your bottle
Seeds & Seedlings
Seeds & Seedlings
Soak your seeds in a weak concentration of The Shropshire Seaweed Company Organic Fertilizerand water (0.1%) for up to 12 hours before sowing. This will boost their germination by up to 80%. When transplanting seedings, dip their roots in a stronger seaweed extract solution (0.2%) to help their roots adjust to their new pot. Once the seedlings are three weeks old, they are ready for their first foliar feed. Again, use the 0.2% mix and mist them all over. Using seaweed at these three crucial stages lays the foundation for healthy and strong plants in the long-term.
Hydroponics
Hydroponics
Hydroponics is a rapidly expanding sector on the British growing landscape - and here too seaweed extract is a very beneficial supplement. The Shropshire Seaweed Company Organic Fertilizer should be added at a rate of 0.05% every seven days. Combine with a two-weekly foliar spray of the crops themselves at a rate of 0.2%.
Grazing
Grazing
The Shropshire Seaweed Company Organic Fertilizer is a low-cost way of keeping the grass in good condition for your animals. It's also totally organic and offers no threat to the health of horses, cows or sheep. You don't even need to clear them out of the field to apply it. Mix 2l of Shropshire Seaweed per acre (or 5l per hectare) and dilute at a rate of 1% with water. Apply evenly across the area once or twice a year for optimum results.
Agriculture
Agriculture
There are a wide range of uses forThe Shropshire Seaweed Company Organic Fertilizer in the agricultural sector. Contact us for more information and we can send you a feed schedule based on what you're growing.
| Plant | Rate | Frequency |
|---|---|---|
| Vegetables, herbs, chillies, tomatoes, potatoes | 0.2 % | Every 10-14 days |
| Flowers | 0.3 % | Every 5-7 days |
| Trees | 0.4 % | Every 7-10 days |
| Hedges and Shrubs | 0.3 % | Every 7 days |
| Hard and Soft Fruits | 0.25 % | Every 7 days |
| Houseplants | 0.2 % | Every 5-7 days |
| Grass 1ml per square metre, or 2ml per square for amenity or recovery |
0.5 % | Every 28 days |
Technical Info
Summary
Summary
Seaweed: Ascophyllum nodosum; Appearance: Dark green to brown; Alginates: 26.6%; Suspended solids: 65g per litre; pH: 4.2; Density: c. 1.07g/cm2; Solubility: Complete; Shelf life: 24 months
Macronutrients (%)
Macronutrients (%)
Calcium: 1.20%; Chlorine: 4.80%; Magnesium: 1.80%; Nitrogen: 1.00%; Phosphorous: 0.16%; Potassium: 2.20%; Sodium: 3.10%; Sulphur: 1.70%.
Micronutrients (PPM)
Micronutrients (PPM)
Barium: 127; Boron: 194; Copper: 6; Iodine: 1200; Iron: 211; Manganese: 22; Selenium: 4; Zinc: 35
Carbohydrates (%)
Carbohydrates (%)
Alginate: 26.6%; Laminarin: 11.2%; Fucoidan: 7.1%; Mannitol: 10.1%; Polyphenols: 6.9%; Amino acids: 7%; Betaines: 150ppm.
Growth Hormones (PPM)
Growth Hormones (PPM)
Cytokinins: 45; Auxins: 182; Gibberellins: 30.
Supporting Seaweed Harvesters
The Shropshire Seaweed Company proudly partners with a dedicated network of skilled harvesters located in the breathtakingly beautiful and remote areas along Ireland's west coast.
Hand harvesting is a cherished tradition deeply rooted in the culture of this region, and it’s a craft that holds immense value for both the people and the environment. Preserving and nurturing this sustainable practice is a cornerstone of our company’s philosophy, ensuring that every step of our process respects both heritage and nature.
FAQs
What plants can I use organic liquid seaweed fertilizer on?
What plants can I use organic liquid seaweed fertilizer on?
Our cold-pressed seaweed feed is safe and effective for all plants — including vegetables, fruit trees, lawns, flowers, and even delicate houseplants like orchids and succulents.
What is the shelf life?
What is the shelf life?
24 months
How do I store the product?
How do I store the product?
Keep cool, protect from sunlight and store in a closed container.
How do I use your Organic Seaweed?
How do I use your Organic Seaweed?
You can simply dilute 10ml of our organic liquid seaweed in 1 litre of water and apply weekly during the growing season. It can be used as a root drench or foliar spray. For concerning gardeners, relate to our "Get the best out of your bottle" table.
Is your Organic Seaweed safe for pets and children?
Is your Organic Seaweed safe for pets and children?
Yes. Our seaweed fertilizer is 100% organic and chemical-free, making it safe to use around pets, children, and wildlife.
What makes our cold-pressed seaweed better than powdered alternatives?
What makes our cold-pressed seaweed better than powdered alternatives?
Cold-pressing preserves over 70 natural minerals, growth hormones, and nutrients that support stronger root systems, lush foliage, and higher yields. Powdered and heated seaweed products often lose much of this bioactive content.
How often should I apply liquid seaweed fertilizer?
How often should I apply liquid seaweed fertilizer?
For best results, apply weekly during active growth. For lawns, apply every 2–3 weeks.
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