Yesterday I sowed mustard as green manure.

There was a free patch in the garden between the Jerusalem artichokes and the carrots.

I weeded it as much as I could . There were a few big thistles in there and then sowed the little round seeds.

I raked the soil afterwards to bury them and also to get some stones out of the ground.

The mustard is of the same family as cabbages and captures the nitrogen from the air and transfers it into the ground. You can sow it any time in the year. Wait until the buds are up and then cut it down, leave it to wilter for a couple of days then return the soil and bury it.

It softens the soil at the same time as it enriches it. It covers any bare parts of your garden, preventing the weeds from growing and also protects it from the wind or rain erosion.

The plant is a Brassica so you shouldn't plant any other Brassica after it.

Here is a picture of the seeds from the wikipedia article.