[mumofstig]

I've always thought it helped and recommended it, on here, and now trials sowed that Phacelia is one of the best things to grow to increase soil organic matter and nutrients for next crop.
https://www.farminguk.com/News/phacelia-and-oil-radish-uncovered-as-soil-saviours-trial-shows_59338.html

[Plot 1 Problems]

It's pretty much the only green manure I use as it doesn't affect my crop rotation plans. Looks pretty too!

[rowlandwells]

I was thinking about using phacelia next year but ended up ordering mustard brown for some reason so I must have rethink when ordering my next batch of green manure to give phacelia a try

[New shoot]

I am not sure what oil radish is, but I bought fodder radish as a green manure and used it this year.   It is a brassica, so does affect rotation plans.  It sprouted like mad and made a load of top growth which I have just strimmed down and covered to rot it. 

It is this one.

https://www.sowseeds.co.uk/collections/green-manure-seeds/products/fodder-radish-green-manure-seeds?variant=923695347

I have phacelia growing which I am intending to leave over winter.  If it dies off in the frost that is fine and if not, I’ll strim and cover that Jan/Feb next year.  The radish was a much denser soil covering and thicker, lusher green tops, plus was ready to deal with now, so I’ve been quite pleased with it