Seaweeds & Biostimulants

Seaweeds and biostimulants are designed to support natural plant and soil processes, helping improve nutrient uptake, root development and overall resilience. They are ideal for use alongside regular fertilisers, or where turf, plants or soil need extra support following stress, poor growth or challenging conditions.

At ProGreen, our range of seaweed extracts and biostimulants can be used throughout the year and across a wide range of applications. Suitable for lawns, turf, plants and soil improvement, these products help promote stronger, healthier growth and long-term performance from the ground up.

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Amvista Phyter
Amvista Phyter Liquid Biostimulant Soil Improver (1L, 1600m²)
Amvista Phyter Liquid Biostimulant Soil Improver (1L, 1600m²)
£22.74 Inc VAT £18.95 Ex VAT
Maxicrop Natural Organic Fertiliser with Seaweed Extract (10L)
Maxicrop Natural Organic Fertiliser with Seaweed Extract (10L)
Maxicrop Natural Organic Fertiliser with Seaweed Extract (10L)
£59.76 Inc VAT £49.80 Ex VAT
Liquid Seaweed+ 1 L
Liquid Seaweed+ 5 L
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Amvista L9 Liquid Seaweed – Nutrient-Rich, Organic UK Sourced (1L, 5L)
£57.53 Inc VAT £47.94 Ex VAT
maxicrop sequestered iron
Maxicrop Sequestered Iron with Seaweed (10L, 8000m²)
Maxicrop Sequestered Iron with Seaweed (10L, 8000m²)
£74.10 Inc VAT £61.75 Ex VAT
Amvista Seaweed Meal 20 kg
Amvista Soil Neutralising Seaweed Meal Fertiliser (20kg, 100-400m²)
£68.11 Inc VAT £56.76 Ex VAT
A1 Lawn Ultimate Lawn Seaweed Extract (1L, 1000m²)
A1 Lawn Ultimate Lawn Seaweed Extract (1L, 1000m²)
A1 Lawn Ultimate Lawn Seaweed Extract (1L, 1000m²)
£26.40 Inc VAT £22.00 Ex VAT
An image of a Maxicrop bottle
Maxicrop Original Seaweed Extract Fertiliser (10L)
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Maxicrop Original Seaweed Extract Fertiliser (10L)
£55.20 Inc VAT £46.00 Ex VAT
Vitax Q4 Plus – Organic Mycorrhizal Rooting Enhancer (60g)
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Vitax Q4 Plus – Organic Mycorrhizal Rooting Enhancer (60g)
£3.00 Inc VAT £2.50 Ex VAT
Amvista Resistor
Amvista Resistor – Plant and Vegetable Biostimulant (250g)
£33.05 Inc VAT £27.54 Ex VAT
Viano Green Comfort Bio Lime Organic Fertiliser (5kg)
Viano Green Comfort Bio Lime Organic Fertiliser (5kg)
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Viano Green Comfort Bio Lime Organic Fertiliser (5kg)
£16.80 Inc VAT £14.00 Ex VAT

Frequently Asked Questions

What does a biostimulant do?

Biostimulants encourage root growth, boost stress resistance, and help your lawn make better use of nutrients already in the soil.

When should I apply a biostimulant or seaweed extract?

They can be used year-round but are especially useful after stress, such as drought, heavy use, overseeding, or treatment with moss and weed control products.

What is seaweed extract used for?

Seaweed extract supports plant health by promoting root development, improving nutrient uptake and helping plants recover from stress caused by weather, wear or treatments.

Can I use fertiliser and biostimulants together?

Yes – they work well together. Fertiliser feeds the grass, while biostimulants improve how the lawn takes in and uses those nutrients.