20-Year-Old Schefflera Declining: Light, Soil Compaction, and Age

Age-Related Changes

After 20 years, Scheffleras naturally become tall and bare at the base. If light is less than ideal, new growth shrinks and slows.

Improve light: Move closer to uncovered window.
Prune: Triggers new growth lower down.
Aerate soil: Compacted soil suffocates roots. Poke deep holes with a stake to reintroduce air pockets.

Photos would help refine advice.

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