In article ,
Charlie Pridham writes:
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| They are very unforgiving of dry roots, ...

And are not good at growing new roots quickly. My mother had one
with the same problem - and she was living in a water meadow, on
nearly pure silt, with the soil surface about 1' above the water
table. The normal summer fluctuation caused the same problems that
you have.


Regards,
Nick Maclaren.