I mix rye, rape, and oats every year with great success. They hit the rye early, then the rape, and finally the oats. As you say picking their way through the plot.
You can buy brassica mixes so it must be okay but I can see what he would mean as overseeding can also result in a poorer plot and wasted seed.
You can buy brassica mixes so it must be okay but I can see what he would mean as overseeding can also result in a poorer plot and wasted seed.