Cover crop drilled after vineing peas first few days of July,mixture of spring Oats,Phacelia,Sunflower,Linseed and Buckwheat.Oats are setting seed,Buckwheat and Phacelia flowering,Sunflowers and Linseed will flower in about a week.There is also some Groundsel and Fathen which is flowering,do I leave until just before drilling wheat in 3 weeks time to maximise OM or terminate now to stop further seed setting?