You must have a really high deer density or not much planted is all I can figure. Mine is ok, and while the deer did manage to eat down some of the small plots, the larger ones, say half an acre, they were not able to mow. I did notice they were eating the radish roots too.
What if you planted your initial stand of them, and then came back say 30 days later and broadcast some more?
I planted alittle over an acre. It ain’t worth it for me to fool with different planting times.