Answer: Stressed plants won't be able to use fertilizer as well as healthy plants so go easy on the feeding. I would use a half strength dilution of liquid fertilizer such as Miracle Gro or Peter's just give the plant a boost without overwhelming it with the message to grow. Forced growth might very well sap the remaining energy from the plant which is not what you want under the circumstances. Try finishing up with your plan to remove some soil and water deeply once each week. If that brings about positive changes, feed them with diluted houseplant fertilizer and see what happens. Best wishes with your plants!
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