I don't know what the problem is or was but those hazelnut seedlings you sent me about ten years ago have yet to produce a single nut. I planted them and wired them from the deer. One died right away. The other two are now about 15 feet high but have never produced a nut.
I'm going to take the wire down and let the deer have them. Except for what the deer will now get out of them this was a total waste of time and effort.
i kept mine caged for the first few years, the deer ignore them now. not much effort for me though, these are growing quite well on their own. wish i had some nuts though.