My gut feeling is the original soil is going to be a gooey wet ball of clay, sitting in the middle of a nice free-draining soil mix.
I had a Juniper like this from a garden that struggled for years, in the end I hosed off all the clay in the middle, put it back in the pot and left it on a roof with nearly no watering other than rain - to get as much sun as possible.
It worked really well! (for my particular tree)
The problem with this operation is it really would be kill-or-cure, so I'll defer to people with more experience than me.
Maybe find a way to monitor the water levels in the inner root ball as well as the outer soil mix?
Have you fed it at all?
I had a Juniper like this from a garden that struggled for years, in the end I hosed off all the clay in the middle, put it back in the pot and left it on a roof with nearly no watering other than rain - to get as much sun as possible.
It worked really well! (for my particular tree)
The problem with this operation is it really would be kill-or-cure, so I'll defer to people with more experience than me.
Maybe find a way to monitor the water levels in the inner root ball as well as the outer soil mix?
Have you fed it at all?
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