Per LB CAD
Northdown was developed at Wye College in England in the early 1970’s and was initially bred primarily for its resistance to downy mildew. It is the offspring of Northern Brewer and Challenger and an aunt to Target.
It is a dual-purpose hop but is particularly good in the early to mid stages of the boil. It is considered slightly higher impacting in flavor than its parent, Challenger. This flavor is considered fresh, flowery and piney with notes of berry and spice.
Descriptions provided by the awesome Hopslist.com