One of the problems with the trees in the polycrub is that they don't really go dormant through the winter - its probably too warm. And difficulties with getting enough ventilation is a known problem with polycrubs - indeed a friend has put a grille at each end of his, to ensure adequate permament ventilation. So the plan is to ensure that the trees in the applecrub have enough ventilation.
The original plan was to have removable panels along each length, so that they can be removed for summer for autumn and spring pruning, and to leave the ends open. The bed is already in quite a sheltered spot, facing due east , so is protected from the worst of northerly ( or southerly ) winds.
But I've had 2nd thoughts . The western side is well protected by bushes and trees that are up the slope a bit . So the current idea is to leave the back open and partially enclose the ends. Already we have had condensation forming inside the roof - indicating that the air in the inside is a bit warmer than the outside.
So this final version has an open western side, and partially enclosed northern and southern ends.
So we'll see how productive the trees become - it might be a bit late for this year , but we can see what happens next year.
And the current state of apples :
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