Has your tree ever been repotted with new compost into a progressively larger pot? Is it regularly watered and fed?
Quite often what happens is the roots grow and fill the pot, using all the nutrients in the soil and compacting it so much that water cannot penetrate the rootball and the tree suffers from drought.
“I am not lost, for I know where I am. But however, where I am may be lost.” Winnie the Pooh
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Has your tree ever been repotted with new compost into a progressively larger pot? Is it regularly watered and fed?
Quite often what happens is the roots grow and fill the pot, using all the nutrients in the soil and compacting it so much that water cannot penetrate the rootball and the tree suffers from drought.