Maxicrop

https://www.harrodhorticultural.com/maxicrop-organic-seaweed-plant-food-pid8457.html

Pure liquid seaweed extract, widely proven in scientific research. Stimulates germination, rooting and establishment from seed to mature plant. Improves natural plant health and the ability to withstand environmental stress. Ideal for flowers, shrubs, trees, fruit and vegetables in the home, garden or allotment.

Approved for Organic growing by the Soil Association.

Chase Organics

https://www.organiccatalogue.com/equipment/feeds-compost/feeds-fertilisers/chase-sm3-seaweed-extract_mh5800

Chase SM3, introduced in 1958 and containing 15% Seaweed solids, was the first seaweed extract produced by Chase, and was originally called Sea Magic – it worked wonders for plants but in those days nobody knew why! Now, thanks to our ongoing research, we know it contains natural plant growth stimulants and a range of trace elements, combining to promote strong healthy plants which are very ‘efficient’ in their uptake of nutrients. 

Quickcrop

https://www.quickcrop.co.uk/seaweed-fertilizer-and-plant-feed

Our seaweed fertilizers are made from collected seaweed.

Seaweed is one of the best gifts you can give your garden as it has long term positive effects on your soil and your plants. It contains naturally occurring growth stimulants as well as a very broad range of essential minerals and trace elements that are used in the growth of strong, healthy plants. 

Seaweed Meal

https://www.organiccatalogue.com/equipment/feeds-compost/feeds-fertilisers/seaweed-meal_mh6782

Hand-harvested from the Atlantic coast of Ireland then dried and milled with no added ingredients. A slow-release fertiliser and soil conditioner, rich in trace elements and amino acids. Regular dressings stimulate microbial activity, improving soil structure and fertility. It promotes healthy growth and increased yield in fruit and vegetables, longer-lasting, richer coloured flowers and is particularly beneficial when applied to grass.

Envii SeaFeed Xtra

https://www.envii.co.uk/shop/seafeed-xtra/

Envii SeaFeed Xtra.

Organic liquid seaweed fertiliser that contains additional iron and plant-based amino acids to improve plants root development and crop yield.

Available in 1L, 5L, 10L and 20L.