Bonnie said:

You twist the sprouts off at
the stalk, they develop from the bottom up. So you pick the
ones at the bottom first. The stalk will continue to grow
until frost.

They seem to prefer the cool weather. Planted them one year and nothing
happened all summer, but when the cold weather came, they really began to grow.
For Christmas dinner, I went out in the snow and picked fresh brussel sprouts.

Dave
http://members.tripod.com/~VideoDave