I eventually put in a request for replacement of the tayberries. (I actually should have done the marionberries as well as they have also not done well).
I received a verification of submitting the request for replacement, but have not heard anything else from them.
The rooted plug were planted with the honeyberry “liners” I received a week before the ison berries. The honeyberries have done excellent (though one was dug up by a squirrel(?) and had to be nursed back to health). None of the plugs from Ison’s ever even pushed a single sprout. I also received a clove currant from them that has done excellent.
Scott