Best Seaweed Fertilizer Deals Online in the UK (10 Deals Found)

Last Updated - 04/10/2026 Sort By:

Best Choice
Mifica

New
ALGA-SOL Cold Press Concentrate Seaweed Extract Ascophyllum Seaweed Extract 5Ltr Biostimulant Fertiliser Fertilizer Seaw
Balanced pH: ALGA-SOL Seaweed Extract contains a balanced pH of around 5-6, making it ideal for all applications. Many s

£19.99
Doff

New
doff CONCENTRATED LIQUID SEAWEED 1L, Green
Organic & natural for the stimulation of vigorous & healthy growth

£7.10
envii

New
envii SeaFeed Xtra – Organic Seaweed Fertiliser, Liquid Outdoor Plant Food Ideal for all Plants, Lawns, Gardens and Hous
Boosts Plant Growth & Crop Yields - Natural Seaweed fertiliser that enhances strong & healthy plant growth, promotes lus

£13.95
Best Value
Maxicrop

New
Maxicrop All Purpose Plant Growth Stimulant, 1L - Natural Seaweed Based Liquid Biostimulant - Multivitamin Boost for All
GROWTH STIMULANT: A powerful natural plant growth stimulant with added seaweed extract that brings out the best in your

£8.00 £12.33
Vitax Ltd

New
Vitax Organic Liquid Seaweed, Concentrated, Bigger Crops, Healthier Plants, Suitable For Plants, Flowers and Fruit & Veg
ALL-NATURAL NUTRIENTS: A completely natural, concentrated liquid seaweed extract that provides organic nutrients for hea

£8.84
Generic

New
10L Premium Liquid Seaweed Fertiliser (1:200 Concentrate) – Organic Plant Feed for Stronger Roots, Greener Leaves & Heal
HIGH-STRENGTH 1:200 CONCENTRATE – Premium liquid seaweed fertiliser designed to deliver powerful nutrients for optimal p

£37.99 £38.99
Multi-Mite

New
MULTI-MITE Organic Liquid Seaweed Fertiliser 5 Litre Plant Feed Concentrate Biostimulant for Gardens Lawns Vegetables Tr
PURE ORGANIC GROWTH BOOST: MULTI-MITE liquid seaweed fertiliser is made from 100% natural cold pressed Irish kelp, givin

£28.95
envii

New
envii SeaFeed Xtra – Organic Liquid Seaweed Fertiliser, Outdoor Plant Food Ideal for all Plants, Lawns, Gardens and Hous
Boosts Plant Growth & Crop Yields - Natural Seaweed fertiliser that enhances strong & healthy plant growth, promotes lus

£36.95
28% Off
Maxicrop

New
Maxicrop All Purpose Plant Growth Stimulant, 2.5L - Natural Seaweed Based Liquid Biostimulant - Multivitamin Boost for A
GROWTH STIMULANT: A powerful natural plant growth stimulant with added seaweed extract that brings out the best in your

£19.70 £27.43
Doff

New
2 X Doff 1L Liquid Seaweed Concentrated Multi-Purpose Feed
2 X Doff 1L Liquid Seaweed Concentrated Multi Purpose Feed

£10.80

10 Seaweed Fertilizer deals are available from: Amazon stores, starting from £7.10.
The biggest discount we found is 35% on Maxicrop All Purpose Plant Growth Stimulant, 1L - Natural Seaweed Based Liquid Biostimulant - Multivitamin Boost for All Garden Plants - Strong Roots - Healthy Growth - Builds Resilient Crops at Amazon.
The lowest price we found is £7.10 while the highest is £37.99.
Prices for the best Seaweed Fertilizer deals average at £19.23.
Last updated on October 4, 2026.
We scanned these quality online stores and more to deliver you with the best offers online available for Seaweed Fertilizer.