Sow Seeds Ltd
Yellow Trefoil 'Black Medick' (Trifolium) is a low growing green manure that has excellent weed-suppressing properties. It is good at fixing nitrogen and if allowed to flower encourages bees & beneficial insects to the area which in turn pollinate veg crops. Yellow Trefoil is great for interplanting taller crops which...
Yellow Trefoil 'Black Medick' (Trifolium) is a low growing green manure that has excellent weed-suppressing properties. It is good at fixing nitrogen and if allowed to flower encourages bees & beneficial insects to the area which in turn pollinate veg crops.
Yellow Trefoil is great for interplanting taller crops which have open canopies like beans, tomatoes, potatoes, sweetcorn & especially long-standing brassicas which overwinter. It is however mainly grown as a summer green manure to help against weed suppression and retain soil moisture.
The benefits of intersowing:
- Retains soil moisture during the summer
- Suppresses weed growth
- Provides a haven for pollinators
- Shelter for a myriad of insects
- A green manure after the main crop - just leave to overwinter and the frosts will knock it back leaving a layer of mulch on the surface!
Yellow Trefoil can be sown between March to August by broadcast sowing just before or as the main crop is establishing e.g. sweetcorn should be at least 15cm tall before sowing trefoil so it does not compete with the seedlings at an early stage. To aid germination keep soil moist. If Yellow Trefoil becomes too tall it can be cut back and the cuttings can be composted or left on the surface as a mulch.
When the veg crop has been harvested, either dig Yellow Trefoil into the soil (15-18cm deep) or leave over winter to protect the soil. It is not generally sown to overwinter as it is not totally winter hardy. It is part of the legume family for crop rotation purposes.
Yellow Trefoil Green Manure Seed Sowing Advice
|When to Sow:||March, April, May, June, July, August.|
|Growing period:||3 months up to 1 year.|
|Soil Type:||Copes with light dry soils, preferably not acid.|
|How to Sow:||Remove weeds especially perennials, rake the soil and broadcast seed at a rate of 1.5g per sqm. Rake in to a depth of 1cm, firm soil and lightly water in.|
|Care:||The green manure should be cut down before flowering when the stems are nice and soft as they decompose quicker, retain more beneficial nutrients and are easier to incorporate into the soil. They can be dug into the soil by turning over into the top 15cms or left on the top as a mulch, the worms will drag down the organic matter and help to aerate the soil.|
How Much Seed Do I Need?
Coverage rates quoted in the table above are based on our recommended seed coverage of 1.5g per m2.
When to Sow Yellow Trefoil Green Manure Seeds
General Green Manure Seed Advice & Information
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