The Ascophyllum nodosum seaweed - with its delicate blend of growth hormones and micronutrients - has been a staple of British agriculture for centuries. So when it came to deveoping Shropshire Seaweed, we decided we better not tinker with it too much.

Instead, our seaweed feed is dried and cold-pressed so none of the goodness of these underwater plants gets wasted. You'll find no chemical supplements here, which is why the product has been approved by Organic Farmers and Growers - the highest UK standard.

The result is a versatile liquid fertilizer which delivers outstanding results across the board: increasing fruit and vegetable yields; promoting stronger, healthier flowers and plants; and producing picture-perfect lawns.

Shropshire Seaweed is harvested sustainably and sold exclusively through the internet and small, independent traders. Relying only on the word-of-mouth recommendations of our loyal fans, this new product has risen to become one of the UK's best-selling organic plant feeds in the space of just four years.

Scroll down to discover more about Shropshire Seaweed and its many applications. If you have any questions, we'd love to hear from you.

How It Works

Seaweed's unique biology nourishes and stimulates plants in a host of ways. Taken together the effect is a powerful organic feed that promotes strong growth and healthy, resilient crops.


Special growth hormones called cytokinins and auxins act like 'plant steroids.' They're absorbed directly through the foliage and result in larger vegetables; juicier fruits with longer shelf-lives; and fuller crops across the board.



Seaweed's plant hormones also work below the surface, stimulating the development of more extensive root systems. This helps to increase water access, resistance to root diseases, and offers protection against wind damage.



Alginates are a well-known 'clay improver' and also help to hold water in the topsoil. Meanwhile, seaweed encourages microbes within the soil to convert unavailable nutrients into a form that plants can actually use.



Seaweed contains many vital micronutrients that help protect against stress and disease. Alginic acid and mannitol, also present in seaweed, are superb carriers of these elements, taking them straight to where they're needed.



Seaweed increases the amount of chlorophyll in leaves, allowing plants to better harness energy from the sun. With more energy plants enjoy stronger growth and appear greener, healthier and more vibrant.


- The Result -

Shropshire Seaweed's unique mix of growth hormones and nutrients offers an immediate pick-me-up to plants of all shapes and sizes. Over the medium-to-long-term, they'll also enjoy signifcant improvements in terms of soil quality, root structure and energy capture. Seaweed creates a complimentary environment for healthier plants and stronger growth. And best of all: it's totally organic.

For more on the science of it all, skip down to the Technical Information section.

Organically Approved

Shropshire Seaweed meets the highest standards for organics in the UK - those set out by the Organic Farmers and Growers.

OF G Approval

Our Happy Growers

Shropshire Seaweed's success is down to the word of mouth endorsements by customers who have tried it and seen the results for themselves.

Since being launched in 2011, Shropshire Seaweed has risen to become the best-selling organic feed on Amazon.co.uk thanks to the massive volume of customer reviews and endorsements. Check out what our customers have been saying by following this link.

Below is a collection of images sent to us by our loyal customers.

  • Picture One
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  • Picture Four
  • Picture Five

The Shropshire Connection

So, how did a landlocked county produce a seaweed company?

Over 100 miles from the nearest coastline, Shropshire is the last place you'd expect to find a seaweed company. When we tell local people what we do, they often look at us like we're completely mad! However, here in the heart of rural England, we do think we know a thing or two about organic living and 'the good life,' which is what drove us to develop Shropshire Seaweed.

Of course, there's no seaweed to be found growing around these parts. We have to go to Ireland for that. The waters there are some of the cleanest in the North Atlantic, which helps to produce the healthiest and best Ascophyllum nodosum around. All the seaweed we use is grown and harvested on a sustainable scale, then it's dried and brought by sea for processing.

Our Application Rates

Shropshire Seaweed is a highly versatile plant feed. Select your application from the grid below to find out how to get the best out of it. You can also read about some of our growers' experiences.


Shropshire Seaweed should be diluted with water at rate of at least 1:50 for agricultural use. The product should then be applied as a foliar feed according to the instructions set out below. Cereals/Maize (4 Applications, 1.5l/Ha) 1). Two-leaf stage 2). After 6 weeks3). Early stem extension 4). Full ear emergence Canola/Oilseed Rape (2 Applications, 1.5l/Ha) 1). Two-leaf stage 2). After 4 weeks Hops (Repeat Applications, 1.5l/Ha) Every 10 to 14 days from April to August. Sugar Beet (3+ Applications) 1). 2.5l/Ha at the early cotyledon stage 2). 2.5l/Ha at the four-leaf stage 3). 1.5l/Ha every 2 to 4 weeks thereafter Potatoes (3+ Applications, 2l/Ha) 1). Apply 10 days prior to tuber initiation2). Repeat at the instance of tuber initiation 3). Continue every 7 to 14 days thereafter with blight control programme Peas/Beans (2+ Applications, 2l/Ha) 1). Apply at the instance of early truss formation 2). Every 4 to 6 weeks thereafter Vegetables/Salad Crops (Repeat Applications, 3l/Ha) Every 2 to 3 weeks during the growing season Shropshire Seaweed should be used at a rate of 1.5l/Ha for each single fruit application. The product should be diluted at 1:50 with water and used as a foliar feed at the intervals specified. Strawberries or Raspberries Apply after first growth; again every 2 to 4 weeks until green fruit stage; then continue with 2 or 3 applications after picking. Applesor Pears Every 7 days from April to September GooseberriesEvery 7 to 10 days from March to July Blackberries or Loganberries Every 2 to 4 weeks from March to September Blackcurrants Every 7 to 10 days from March to July (continue after petals fall until fruit swell)


General Vegetables

Aside from terrific results on tomatoes, chillies and potatoes, Shropshire Seaweed will enhance pretty much any vegetable you could care to mention: courgettes, cucumbers, radishes, carrots - the list goes on. You'll be amazed by the versatility of the feed and the range of veggies that it will improve. There really is only one rule when it comes to treating your produce - little and often. Mix 10ml of Shropshire Seaweed in 5l of water to create the perfect feed. It might not sound like a strong mixture, but seaweed extract is effective at very low levels. Then apply this solution as a spray directly to the foliage of your vegetables. Repeat every 10 to 14 days during summer - and combine with with a monthly root drench of the same concentration. What Our Growers Say "I have been using this product for around 3 months now and have noticed a significant difference in the growth rate and health of the veggies I am using it for. I am using it on potatoes, parsnips, garlic, peppers, tomatoes, beetroot, broad, French & Italian bean varieties, onions, carrots and leeks. This summer in Scotland has been poor with a lot of rain and cloud however, if I measure my crops against my neighbours at the allotment, mine are some distance ahead in growth and health." - bogfairy "Very good fertilizer. I use a capful in 5 litres of water, once every fortnight. Happy plants and loads of veggies!" - Sid "I bought this at the start of the season as a few of my plants looked like they needed a boost. The results were quick and noticeable. My french beans went from looking yellow and weak to strong and green in less than 10 days." - Adam F "I try to be organic in my garden and on the allotment and this product fits in well. It certainly seems to have worked on my veg this year. I have used it on my courgettes and whilst all the plots around me are struggling to get their plants going, I have a glut! I will definitely be purchasing this product again." - sarah

General Vegetables

A Very British Fertilizer

Shropshire Seaweed builds upon a long-history of using kelp in British agriculture

Historians have discovered that seaweed has been harvested for use as a plant supplement since Roman times, with the earliest evidence of its use being in the Scottish islands. The practice appears to have caught on and by the nineteenth-century many British coastal locations boasted their own seaweed gathering operations.

Until relatively recently seaweed cultivation stayed limited to coastal regions due to the difficult in transporting the heavy kelp cross-country. However, advances in drying and processing techniques have now made seaweed a convenient liquid feed and it's used the world over.

Modern gardeners who use liquid kelp extract, such as Shropshire Seaweed, continue a British growing tradition stretching back over 1,500 years.

Heard Enough?

Order your Shropshire Seaweed today and receive free shipping anywhere in the UK.

£10 / 1 litre

£10 / 1 litre

Ideal trial size. Give it a go.

£32.49 / 5 litres

£32.49 / 5 litres

The gardeners' choice.

£49.99 / 10 litres

£49.99 / 10 litres

Keen growers and allomenteers.

£79.99 / 20 litres

£79.99 / 20 litres

Best value. For professionals.

Free Shipping In The UK

We deliver Shropshire Seaweed free to all UK customers and offer fantastic rates to growers in Europe and beyond

We use Parcelforce to offer a free, next-working-day delivery service to all customers in England and Wales on orders placed before 2pm. Customers in Scotland and Northern Ireland recieve free delivery within two working days of their order. Not from the UK? We also offer great, flat-fee international rates, including £6 per order to Ireland, France and Germany, and £10 per order to Spain, Italy and Portugal.

The Small Print

Everything you need to know about what's inside Shropshire Seaweed.

  • Seaweed: Ascophyllum nodosum
  • Appearance: Golden to dark brown
  • Alginates: c. 30%
  • Suspended solids: c. 5%
  • pH: 5.3 to 6.0
  • Density: c. 1.05g/cm2
  • Solubility: Complete
  • Shelf life: 24 months
Macronutrients (%)
  • Calcium: 1.95
  • Chlorine: 3.42
  • Magnesium: 1.23
  • Nitrogen: 0.62
  • Phosphorous: 0.12
  • Potassium: 2.11
  • Sodium: 3.10
  • Sulphur: 1.56
Micronutrients (PPM)
  • Barium: 127
  • Boron: 194
  • Copper: 635
  • Iodine: 1200
  • Iron: 211
  • Manganese: 22
  • Selenium: 43
  • Zinc: 351
Active Agents
  • Auxins
  • Betaines
  • Cytokinins
  • Alginic Acid
  • Minnitol
  • Lamanarian
  • 18 Amino Acids
  • 10+ Vitamins

Get In Touch

Got a question about Shropshire Seaweed? Fill in the form below and we'll get right back to you.

We endeavour to answer all product questions and queries within 48 hours - but we'll usually get back to our customers a lot quicker than that.

If you prefer to speak to us directly, it is best to call us on 01952 677002. There will be somebody to take your call between 9am and 5pm, Monday to Thursday - and between 9am and 3pm on Fridays.

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