Hi, I have a healthy triple variety semi-dwarf apple tree . It produces Golden Delicious and Granny Smith. The Northern Spy branches have never made blooms (just leaves) . I espaliered the tree and I chose the Northern Spy as the main header.
Does it need a different pollinator. I'm in zone 5 b but as everyone knows the past few years have been unpredictable ,to say the least. Sincerely ,Earthd