Plant is dying

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I have no idea of what happenend up until 2 weeks ago it was full and green. I've had the plant for 5 months and two weeks ago the leaves started turning yellow now thy're just brown and dead. The stems are still strong but I have no idea of what happened I changed nothing that I was doing.

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I posted pictures the first one is from last week the brown is from this morning

[Bloomin Idiot]

Looks like lack of food and water. Possibly sunburn too. That pot is small for that plant. Prolly root-bound too. 1 gal per month of life minimum. Something like that at leasst 20 gallons IMO.


What do you feed it? Is the water ph corrrect? What is the soil ph?