I've had deer on the same property hit deer in one part of the club but not another. I have had deer not eat brassicas for a year then hit them the next. I have had them pick out radishes and leave turnips and vice versa. There are benefits to the soil even if the deer leave them alone, so I keep using them. I just try to not plant in the same field more than two years. There are some diseases that get them if you continually plant brassica on the same spot.