10 Best Organic Mineral Fertilizer For Plants in The UK

Last updated on 17/07/2025

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Ecoworm Soil Extract for All Plants 1L - Organic Vermicompost Extract - Multipurpose Fertiliser - Soil Regenerator - High in Potash (makes 200L)

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Why We Love It

Organic and safe ingredients.
Enhances plant health effortlessly.
Yields bigger, tastier produce.

Main Highlights

Suitable for all plants in all conditions (indoors, outdoors, greenhouse)
Organic and safe for humans and pets
Extracted from organic worm castings (not worm tea, but high quality extract)
Fertiliser, rebuilder, conditioner and natural pest and disease control (all in one bottle)
Tastier and bigger fruits & vegetables
Provides plants with essential nutrients and minerals for healthy growth
Dilute with water and apply to plants & soil (no bad smell)

Fertilizer for Cucumbers & Cucurbit Plants – 1kg | Mineral Plant Food for Zucchini, Melon, Squash | Boosts Yield & Taste

Why We Love It

Specialized for cucurbit crops.
Supports abundant harvests effectively.
Rich in essential key minerals.

Main Highlights

✅ Specialized formula for cucumbers and cucurbit crops – Ideal for zucchini, pattypan squash, and melons.
✅ Balanced nutrients for high yields – Supports abundant harvests and improves flavor and nutritional value of vegetables.
✅ Rich in key minerals – Contains Nitrogen (10%), Phosphorus (8%), Potassium (18%), Calcium (3%), Magnesium (2%), and Sulfur (35%).
✅ Easy application – Use before planting and during the growing season; simply mix with soil and water in.
✅ Long growing season coverage – Best used from May to September; suitable also in April and October.

envii SeaFeed Xtra – Organic Seaweed Fertiliser, Liquid Outdoor Plant Food Ideal for all Plants, Lawns, Gardens and House Plants, Rich in Additional Nutrients - 1 Litre Makes up to 500L

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Why We Love It

Promotes strong plant growth.
Multi-purpose with added extras.
Easy application process.

Main Highlights

Boosts Plant Growth & Crop Yields - Natural Seaweed fertiliser that enhances strong & healthy plant growth, promotes lush foliage, and increases crop yields for thriving plants.
Nutrient Rich Plant Food - Enriched with iron and plant-based amino acids to nourish garden plants, improve soil health, and support plant & root development.
Versatile & All Purpose - Ideal for lawns, fruits, vegetables, flowers, trees, and all other garden plants. Perfect for any outdoor or indoor plants.
100% Organic & Vegan - Seafeed Xtra is made from natural, sustainably sourced ingredients & certified Organic by OF&G.
User Friendly Design: Comes with an easy-to-use bottle featuring a built-in measuring chamber for hassle-free application. One litre of Seafeed Xtra makes up to 500 litres of feed when diluted, suited for all size gardens.

Organic Seaweed Fertiliser, Nutrient-Rich Plant Feed, Liquid Seaweed for Plants, Lawns & Vegetables UK-Made (1L)

Why We Love It

Organic certification ensures quality.
Nutrient-rich for plant growth.
Supports robust root development.

Main Highlights

ORGANIC CERTIFICATION: Certified by Organic Farmers & Growers, ensuring high-quality natural seaweed fertiliser for your garden
NUTRIENT-RICH FORMULA: Packed with essential minerals and trace elements that promote healthy plant development and vigorous growth
ROOT DEVELOPMENT: Specially formulated to enhance root system growth, leading to stronger and more resilient plants
VERSATILE APPLICATION: Suitable for various plants including vegetables, flowers, lawns, and garden plants throughout the growing season
UK MANUFACTURING: Produced in the United Kingdom using premium seaweed extract for consistent quality and reliable results

Natural plant feed - Comfrey Concentrate - Organic liquid fertiliser (1 litre)

Why We Love It

Organically grown for pure quality.
Hand selected for optimal nutrients.
Safe for pets and animals.

Main Highlights

100% organically grown comfrey concentrate
Hand selected leaves from home grown cultivated comfrey garden
Natural plant feed - No chemicals
Contains high levels of plant nutrients
Safe to use around pets and animals - (Adult supervision required, not to be digested)

Wiggly Wigglers Volcanic Rock Dust Organic Fertiliser Soil Wormery and Compost Remineraliser Natural Mineral Enrichment for Healthy Plants (1kg)

Why We Love It

Enhances healthy worm growth.
Rejuvenates tired soil effectively.
Versatile for all gardening types.

Main Highlights

VOLCANIC ROCK DUST --- Volcanic rock dust contains the essential minerals and trace elements required for healthy growth in your composting worms. This rock dust can also be used to invigorate compost and to remineralise soil.
ENHANCES SOIL HEALTH --- The volcanic rock dust is a fantastic natural source of minerals which can help to rejuvenate tired soils helping to promote plant growth, creating an optimal environment for plants.
TRACE ELEMENT RICH --- Rock dust has amazing benefits in the form of all the essential trace elements and minerals in the dust which are released back into soil over time. Volcanic rock dust; rock dust; organic fertiliser.
EASY APPLICATION --- Sprinkle small handful per 30 square cm onto surface of your wormery every month. Try a small area with this amount and see if the worms congregate. Simply sprinkle on soil, compost, or wormeries.
VERSATILE USE --- This soil & compost remineraliser is suitable for use in vegetable gardens, flower beds, and container plants, making it a great addition to any gardening regimen. It can be applied to fields and parks, whether grass land or cultivated.

Dr. Marco’s™ Plant Spray 500ml | 100% Organo-Mineral Indoor & Outdoor Seaweed Enriched Liquid Spray | Ready to Use, Premium Natural Plant Food & Fertiliser Formula for Healthy Long-Lasting Growth

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Why We Love It

Organic formula with 70+ nutrients.
Versatile for all plants types.
Natural pest repellent benefits included.

Main Highlights

Ultimate Organic Plant Care - Dr. Marco’s Organo-mineral fertiliser provides a complete plant nutrient system from the soil up. It contains a unique organic and seaweed-based formula packed with over 70 key nutrients and an outstanding NPK of 16-13-16. Give your plants the fuel they need to thrive with one simple spray!
For Indoor and Outdoor Plants - Dr. Marco’s Plant food formula is a complete natural fertiliser, containing all three primary nutrients required for plant growth (Nitrogen, Phosphorus and Potassium). This means it is incredibly versatile and can be used on both indoor, and outdoor plants and flowers.
Contains 70+ Naturally Occurring Vitamins & Minerals – Our unique science-backed, natural plant food formula, utilises an enriched seaweed extract for maximum nutrition and soil rejuvenation. Seaweed contains over 70 naturally occurring vitamins, minerals, and other key ingredients, all in a bioavailable form. Enhance plant growth, seed germination, root formation, and overall plant health.
Heavy-Duty, Leak-Proof Construction - Due to the highly concentrated and nutrient-rich nature of our formula, we have developed an advanced heavy-duty trigger spray with an integrated filter that eliminates blockages and stops leakage completely. It has been tried and tested and can be reused for multiple liquid spray applications.
Natural Pest Repellent - Another great benefit of our seaweed-based formula is that it acts as a natural pest repellent. Common pests avoid seaweed because of its salt content, but don’t worry, the salt concentration is not high enough to damage your plants or soil. In fact, the soil will be rejuvenated with regular use. Aside from pests, regular use also helps to improve your plant's resistance to disease and abiotic plant stress.
Easy to Use & Ready Made – Dr. Marco’s is a ready-made organo-mineral formula designed to be used straight out of the bottle. To use, shake the bottle before spraying generously onto the leaves of your plants (70%) and soil (30%) once a fortnight. It is best to spray once in the morning and once before sunset, which are optimal times for the liquid fertiliser to be absorbed more readily by the plant. Dr.Marco’s - Dr.Marco is a real person with a PHD in Agronomy who has spent decades working to create better and safer products that will help the world fight the use of dangerous and harmful chemicals, fertilisers and pesticides.
Unlike Conventional Fertilisers - Every application of an organo-mineral fertiliser is also adding organic matter to the soil. This helps to regenerate soils, building a bigger 'nutrient store' in the soil, which increases 'natural fertility' for season-long soil nutrient supply to build long-term yield resilience. There is also an improvement in soil structure for better crop establishment and an increase in nitrogen use efficiency, meaning less nitrogen needs to be applied.

Promotes lush, healthy growth.
Effective moss control solution.
Organic and chemical-free option.

Main Highlights

SUPERIOR QUALITY-Seaweed is the fertiliser of choice for home growers and professional gardeners alike, and is used for turf and pitch maintenance by many groundsman. It is not limited to grass lawn, however, and can be used on many different varieties of plants and crops to achieve lush, healthy foliage. Fruiting plants will greatly benefit the nutrient packed liquid seaweed yielding bumper crops of fruit and veg.
MOSS-FREE LAWNS-If your having trouble with moss on your lawn, then we would recommend our Liquid Seaweed with Added Iron Sulphate. It will help to eradicate any existing moss and deter future growth, whilst having excellent greening up properties.
ORGANIC, USTAINABLE & CHEMICAL-FREE- Harvested sustainably from the isles of the Outer Hebrides using heat extraction and fermentation means this nutrient rich Atlantic seaweed is completely free from any additives and chemicals. It'll provide your lawn and plants with essential nutrients and minerals they need for strong and healthy growth. Another benefit of the seaweed is that it improves natural plant vigour and the ability to withstand environmental stress.
FAST UPTAKE-Unlike many manufactured chemical fertilisers, liquid seaweed has a very fast uptake and will be quickly absorbed by your plants or turf. Many of these can also only be applied via the soil, whereas liquid seaweed can be applied either root, or as a foliar spray, increasing the efficiency of the nutrient uptake.
APPLICATION RATES-As a general guide we recommend a a dilution rate of 50ml of liquid seaweed per litre of water. Dosage will depend on the type of plant or crop being treated however. For newly planted/delicate crops a lower rate is advised until the plant is fully established. Responsibility for soil/environment conditions, individual mixes and results is at the end of the user. If unsure test a small part first.

GREEN24 Brugmansia, Datura (Angel's Trumpets) Liquid Fertilizer HighTech NPK, Root Soil Foliar Fertiliser - Professional Plant Food

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Main Highlights

New Liquid Fertilizer for: Brugmansia hybrid flowers, Datura, Angel's Trumpets, Moonflowers
This food for plants belongs to the latest generation of fertilizers, for healthy and bright green leaves, stable branches, strong formation, balanced rooting, very beautiful flowers.
Very rapid effects, can be administered via the roots and as a foliar fertilizer. For 60-125 liters of ready to use liquid fertilizer
Content: 250 ml, works as an economical concentrate. Simple dosage with the help of the cap.
The fertilizers from the GREEN24 PROFI LINE were developed by gardeners of various departments and were evolved and produced based on the current knowledge in the field of propagation and cultivation of plants.

Response of Sweet pepper crop to organic and biofertilizer application: Reducing the used quantities of mineral fertilizers

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8.8

Excellent

We scanned 1848 products

We reviewed these offers relevant to the Organic Mineral Fertilizer For Plants within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Ecoworm, TRANS - PAL, envii, Oceanic Organic Ltd, Raw and Pure, Wiggly Wigglers, Dr.Marco’s, Elixir Gardens, GREEN24, VDM Verlag, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Organic Mineral Fertilizer For Plants in the market, we considered we took a deep dive into 9241 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Ecoworm Soil Extract for All Plants 1L - Organic Vermicompost Extract - Multipurpose Fertiliser - Soil Regenerator - High in Potash (makes 200L). We love many things about this product by Ecoworm. What sets it apart from the competition is Organic and safe ingredients, Enhances plant health effortlessly, Yields bigger, tastier produce.
The best value product for most shoppers and where user satisfaction is continuously the highest is Fertilizer for Cucumbers & Cucurbit Plants – 1kg | Mineral Plant Food for Zucchini, Melon, Squash | Boosts Yield & Taste by TRANS - PAL based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Organic Mineral Fertilizer For Plants and the best cost-to-value ratio is Response of Sweet pepper crop to organic and biofertilizer application: Reducing the used quantities of mineral fertilizersat VDM Verlag with a % discount.
Our list of the best Organic Mineral Fertilizer For Plants is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

10 Best Organic Mineral Fertilizer For Plants in The UK

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We scanned 1848 products

We concluded that: