Nope, once Brussels Sprouts or Cabbage bolts (goes to seed) it is done
except for producing seed. If you planted it last fall, it should have
headed in late fall early winter. I usually pinch the tops off mine
around Thanksgiving. Seems to give extra size to to the sprouts, which
get large enough (bottom ones ) to harvest at Christmas. Since you eat
the seed heads on broccoli, Bolting is not a major problem. Just cut it
before it flowers.