As you no doubt remember from the epic blog post last year about Turnips (see "Mystery Turnips" 2/3/09)...we are growing a mysterious variety of very large heirloom turnips in the garden.
Last season the turnips grew well and were delicious. I left about 6 plants in the ground over winter so that they would flower and set seed this year (a biennial cycle). It is early April and the plants have begun to push up their flower stalks. This is good. I just need to make sure that no other Brassicas in the garden (overwintered kale, etc.) are allowed to flower or they may cross-pollinate and then the resulting seeds won't breed true to the heirloom turnip variety....