From Seed to Seed.......paraphrased and condensed.
Biennial.......You got that.
Will cross with all varieties of cabbage, cauliflower, broccoli, collards, kohlrabi, and kale.
Don't save seeds from one plant only.
Self-incomapatible, needs insects for pollination.
Plants grown for seed must be isolated by one mile or caged with trapped insects.
Hmmmmmmmm............get the hammer and stake.
Charlie