Now, this is from memory ( of reading, I wasn't there at the time), but the Victorians blamed a lot of canker and disease on deep roots, and recommended keeping the roots as close to the surface as possible. They cut off any tap root and put a stone under the centre of the tree to prevent it regrowing. The roots were then spread out close to the surface and earth mounded over them. Frequent advice was given in the Victorian equivalent to this forum, to lift and replant the fruit trees every couple of years to keep the roots close to the surface.
Now I'd imagine your trees, FB, in your dry situation, have to put their roots down deeply to survive and I wonder if that's connected with the canker difference? If I dig anywhere in my old orchard, there'll be apple roots within 6 inches of the surface and I put stones under many of the trees when I planted them in 1990. Canker is quite unusual here these days, none at all in the new orchard of 140 trees, 70 varieties.
By the way, the downside of growing Blenheim is the long, long wait for fruit - I planted a two-year-old tree and tasted my first apple ten years later. Twenty years from planting it's a large standard tree with enough apples to feed a village, but it would frustrate someone who's waiting for a crop from a cordon.
Now I'd imagine your trees, FB, in your dry situation, have to put their roots down deeply to survive and I wonder if that's connected with the canker difference? If I dig anywhere in my old orchard, there'll be apple roots within 6 inches of the surface and I put stones under many of the trees when I planted them in 1990. Canker is quite unusual here these days, none at all in the new orchard of 140 trees, 70 varieties.
By the way, the downside of growing Blenheim is the long, long wait for fruit - I planted a two-year-old tree and tasted my first apple ten years later. Twenty years from planting it's a large standard tree with enough apples to feed a village, but it would frustrate someone who's waiting for a crop from a cordon.
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