i wouldn't mess with the roots to much. just transplant to the ground and give a good watering. trying to remove the old soil is going to damage the roots. i had to flush one last night. i ran the hose thru it. it's a 5 gallon flower pot. i ran at least 10 gallons thru it. it looks better already. when i flush i soak then let it drain then soak again. i did this 6 times. now i will lightly feed next time i water. hope this helps.

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