Darkmar 21 is a traditional bedfordshire type, has a long cropping season,  december till march, is very popular variety with gardeners  as the sprouts are large , deep green in colour ,sweet and tasty.
 
An old english variety of long standing, by harvesting the lower sprouts first you can enjoy a steady supply without them all maturing at the same time and you will have a heavy yield of sprouts through the winter, even in the harshest weather.
 
Darkmar 21  is easy to grow reliable  sort  with a fine flavour