Green Manure Crops

Keeping your gardens covered with green manure crops is an excellent way to keep your soil healthy in between growing seasons, as it helps to control the weeds and protects the soil. Sun and heavy rains can compact the soil and leach out beneficial nutrients. When green manure crops are dug in to the garden, they add organic matter, nitrogen, and minerals that are brought up by the roots.

When choosing the best type of cover crop for your situation, you need to consider your climate, soil type, the duration needed and whether you want a nitrogen-fixing crop or a crop that produces a lot of organic matter to dig back into the soil.

Next: Which crop to choose?

Image: Benketaro (Flickr)

Deep-rooting plants can break up the sub-soil and bring up trace minerals that are deep in the soil. Alfalfa and red clover are good examples of such deep-rooting plants. These are also good cover crops if you’re not planning to plant in that bed or field for a longer period as they can grow for a year or more.

Broad beans are excellent for breaking up heavy soil, and they grow well in the colder months. Not only do they fix nitrogen into the soil, they have the added bonus of being edible – a delicious treat in the spring.

Buckwheat is a good cover crop for areas where you plan to plant again soon, as it grows very fast and breaks down quickly. Rye, barley or wheat can be used to help suppress weeds. They are rich in organic matter, and can be dug in early or left longer.

Lupines are a great cover crop if you want something that fixes nitrogen, is fast growing, breaks down quickly when dug in and has beautiful flowers as an added benefit. Another beautiful flower is the Marigold, which makes a good cover crop in the summer as they help repel nematodes that live in the soil and eat the roots of plants. They are also great as a companion plant, especially for tomatoes.

with Magic Merlin Rees

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janine k.
janine k.4 years ago

There are millions of ways to make the cycle of life more whole. While feeding sunflowers to the birds, I noticed squirrels wanted some too. The benefit of feeding the squirrels is that if you give them a nice sunflower, they leave a nice fertilizer. No wonder the Roses in that section are doing quite well. Nitrogen without harmful effects...Manure, it's a good thing.

Eternal Gardener
Eternal Gardener4 years ago

Love green manures! Also liquid weed teas!

Sue Matheson
Sue Matheson4 years ago


Barbara Erdman
Barbara Erdman4 years ago

noted and thanx

Catherine Turley
Catherine Turley4 years ago

love hairy vetch. pink and purple, tiny, tubular flowers that hummingbirds love.

Stefanie W.
Past Member 4 years ago

Every day i learn something new is a good day. Thanks for making my day :-)

Julianna D.
Juliana D.4 years ago


Gale T.
Gale T.4 years ago

I think I like the idea of planting marigolds all over my garden so pretty.

Julie W.
Julie W.4 years ago

It's not really necessary to dig them in. They will break down on top of the soil and still provide organic matter. Saves an awful lot of hard work!

susanna l.
susanna l.4 years ago

we have crimsom clover on our community garden beds this year, am excited to see how it works out