I planted some bare rooted ones last year and they did exactly the same.I just left mine and this year I have loads of fruit forming on my canes!
Dunno what it is maybe some sort of definctincey,all I know is mine are doing fine.

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The greatness comes not when things go always good for you,but the greatness comes when you are really tested,when you take,some knocks,some disappointments;because only if youv'e been in the deepest valley can you ever know how magnificent it is to be on the highest mountain.