The Northern Spy was chosen because of its hardiness and straight, clean, erect growth, making it a vigorous and comely stock.
The Northern Spy, Æsop, and Spitzenburg are also admirable kinds.
Our trees top-worked to Jonathan and Northern Spy are bearing good this year; they show no signs of winter-killing.
These Northern Spy trees, used in this case as stocks, were regularly grown by nurserymen.
The calla lily had two buds, the Northern Spy tree was not going to bear very well.
However, root infestation has been overcome by using root stocks, such as Northern Spy, that are immune.