The Organic Gardening Catalogue

https://www.organiccatalogue.com/seeds/featured-flower-seeds/green-manure-seeds/

Growing a 'green manure' is an easy and effective way to add vital organic matter to the soil anywhere in your garden or allotment. The foliage helps to suppress weeds and provides cover for beetles and other pest-eating creatures. The roots will help improve your soil structure.

Plan green manures into your vegetable crop rotation; grow them anywhere the soil would otherwise be left empty for six weeks or longer.

Kings

https://www.kingsseeds.com/Products/Vegetable-Seeds/Green-Manure

We supply seed to commercial growers of flowers and vegetables, wholesale to large users of seed and to the home gardener through our seed packets. Whichever type of customer Kings are supplying they all have one thing in common; they all receive the same fine quality seed. There have been many changes over the hundred years of our company's existence but quality of the highest standard is one thing that has never changed at King's and never will in the future.

D T Brown

https://www.dtbrownseeds.co.uk/Vegetable-Seeds-1/Green-Manure-Seed-DTB/

The incorporation of green plant tissue into the soil is an ancient practice known as ‘green manuring’. Green Manures are used to disrupt pest and disease life cycles, improve soil fertility and nutrient levels and suppress weeds.

D T Brown have an impressive range of Green Manures to cover all requirements.

Cotswold Seeds

https://www.cotswoldseeds.com/seeds/10/green-manures

We are an independent family-run company, based in Moreton-in-Marsh, that now works with over 15,000 farmers across the UK, supplying everything from green manures, cover crops and herbal leys to dual-purpose long term leys and silage leys.

Our small team of highly experienced technical advisors are on hand to share their specialist knowledge on a one-to-one basis.

Pretty Wild Seeds

https://www.prettywildseeds.co.uk/category/green-manure-seeds

Choosing Green Manure Seeds can seem very confusing but with a little time and using a few rules the options will become clearer.

The choice of seed will depend on why you are planting a Green Manure, how long you require the ground to be covered, what was there before, and what you want to plant after, the time of year and the type of soil you have.